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pH 170

Operating instructions

pH Monitor

pH 170

82

23°C3 8

pH

pH 170

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Accuracy whengoing to press

The use of advanced technology and the high quality standard of our instruments are the result of continuous development. This may result in differences between this operating manual and your instrument. Also, we cannot guarantee that there are absolutely no errors in this manual. Therefore, we are sure you will understand that we cannot accept any legal claims resulting from the data, figures or descriptions.

Copyright © Weilheim 2010, WTW GmbHReprinting - even as excerpts - is only allowed with the explicit written authorization of WTW GmbH, Weilheim.Printed in Germany.

pH 170 Contents

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pH 170 - Contents

1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 831.1 General features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 831.2 Outputs and interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

1.2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 841.2.2 Freely configurable relay (RT and RT RS option) . . . . . . . . . . . . . . . . . . . . . . . . 841.2.3 SensCheck relay (sensor monitoring) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 841.2.4 RS 485 digital interface (RT RS option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

1.3 Nameplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

2 Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 872.1 User qualification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 872.2 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 882.3 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 893.1 Onsite installation: General instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 893.2 Electrical terminal strip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 903.3 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

3.3.1 General installation instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 923.3.2 Line power connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 933.3.3 Relay contacts and current outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 943.3.4 RS 485 digital interface (RS option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

3.4 Connecting the sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 953.4.1 Sensor types and connection options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 953.4.2 Connecting the SensoLyt® 690 or 700 (SW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 963.4.3 Connecting the SensoLyt® 650 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 973.4.4 Connecting the PL 81/82... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 983.4.5 Connecting other electrodes and separate temperature probes . . . . . . . . . . . . . 99

4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1014.1 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1014.2 Operating keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1024.3 Operating levels and general operating principles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1034.4 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

4.4.1 Call up configuration level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1044.4.2 Configuration setting table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

4.5 Parameterization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1114.5.1 Calling up the parameterization level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1114.5.2 Setting table of parameterization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

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4.6 Freely configurable relays (RT and RT RS option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1184.6.1 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1184.6.2 Limit indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1194.6.3 Proportional control with relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1224.6.4 Timer for external sensor cleaning system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1264.6.5 Display of the relay states in the operating level . . . . . . . . . . . . . . . . . . . . . . . . . 127

4.7 pH calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1284.7.1 Calibration procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1284.7.2 Auto Cal TEC (rEC1 REL1) calibration routine . . . . . . . . . . . . . . . . . . . . . . . . . . 1294.7.3 Con Cal calibration routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1324.7.4 Calibration error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

4.8 Display of instrument information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1354.9 Test mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

5 Maintenance and cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1395.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1395.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

6 What to do if ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

7 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

8 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1458.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1458.2 Measurement characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

8.2.1 pH/mV Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1498.2.2 Temperature measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

9 Indexes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1519.1 Display abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1519.2 Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1539.3 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

pH 170 Overview

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1 Overview

1.1 General features

Fig. 1-1 pH 170

1 Watertight housing (IP 66)

2 Display

3 Operating keys

4 Sensor input jack

5 Cable glands

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1

2

3

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Overview pH 170

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1.2 Outputs and interfaces

1.2.1 Overview

The monitor has the following outputs and interfaces depending on the instrument version:

1.2.2 Freely configurable relay (RT and RT RS option)

Both potential-free K1 and K2 relays of the RT and RT RS instrument versions can be used as follows:

As a fault indicator if the power fails

As an indicator relay for a frozen measured value (e.g. when calibrating)

As a threshold indicator if a specified threshold is undercut or exceeded (main measured value)

As a proportional controller with pulse width or frequency modulation for controlling the pH value

As a control relay with timer function, e.g. for time-controlled sensor cleaning operated by compressed air.

1.2.3 SensCheck relay (sensor monitoring)

The SensCheck relay is designed as a closer (galvanically separated from the instrument). In conjunction with the SensoLyt® 700 (SW) armature it is always active (=closed) if a sensor error such as broken glass occurs. At the same time, the SensCheck symbol appears on the display (see section 4.1).

Instrument version Relays Current outputs Digital interfaces

pH 170 (standard) 1 x SensCheck 1 x analog output for the pH/mV measured value

-

pH 170 RT 2 additional, freely configurable relays

1 additional analog output for the temperature

measured value

-

pH 170 RT RS as RT option as RT option 1 x RS 485

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1.2.4 RS 485 digital interface (RT RS option)

The monitor can communicate with other instruments via the RS 485 digital interface of the RS instrument versions.

The following operating modes are possible:

Master mode (Prn mode): Unidirectional mode for the output of measured values. The main and auxiliary measured values are sent. The interface is constantly active in master mode. The data are sent to a data terminal (e.g. PC with terminal software or printer).

Slave mode (SL mode): Bidirectional mode in the bus network. In this operating mode the monitor ("slave") works together with a control computer ("master") on the master/slave principle. A total of 31 slave devices can be connected to one master in the bus network. All slave devices are addressed by the control computer under their bus address and execute the transferred commands, e.g. sending measured values, calibration data and relay states.

NoteThe RS 485 interface that accompanies the RT RS instrument versions is described in detail in a separate manual.

PROFIBUS connection The monitor can be connected to a PROFIBUS DP network via the RS 485 interface with the PROFIBUS converter PKV 30-DPS that is available as an accessory.

1.3 Nameplate

Fig. 1-2 Nameplate (example)

The nameplate also includes the serial number as well as details of the supply voltage and the installed instrument options. The nameplate is located on the right side of the housing.

Ser.-Nr: xxxxxxxxx

230 VAC 50/60Hz 18VA

WTW

pH 170-RTRS Instrument options

Overview pH 170

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pH 170 Safety instructions

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2 Safety instructions

This operating manual contains essential instructions that have to be followed during the commissioning, operation and maintenance of the pH 170 monitor. Thus, it is essential for the operator to read this component operating manual before carrying out any work with the system. Always keep this operating manual available close to the pH 170 monitor.

General safetyinstructions

Safety instructions in this operating manual are indicated by the warning symbol (triangle) in the left column. The signal word (e.g. "'CAUTION") indicates the severity of the danger:

WARNINGindicates instructions that must be followed precisely in order to prevent serious danger to personnel.

CAUTIONindicates instructions that must be followed precisely in order to avoid slight injury to personnel or damage to the instrument or the environment.

Other labels

NoteThis symbol indicates instructions that describe special features.

NoteThis symbol indicates cross-references to other documents, e.g. component operating manuals.

2.1 User qualification

Special userqualifications

The following installation activities may only be performed by a qualified electrician:

Connection of the pH 170 monitor to the mains supply.

Connection of external, mains voltage conducting power circuits to the pH 170 monitor.

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2.2 Authorized use

The authorized use of the pH 170 monitor consists solely of stationary measurement in water and wastewater applications, seawater, brackish water and aquacultures. Read the technical specifications in accordance with chapter 8 TECHNICAL DATA. Only operation and use according to the instructions in this operating manual is authorized.

Any other use is considered as unauthorized. Unauthorized use invalidates any claims with regard to the guarantee.

2.3 General safety instructions

The pH 170 monitor is manufactured and tested in accordance with the relevant guidelines and standards for electronic instruments (see chapter 8 TECHNICAL DATA). It left the factory in perfect condition.

Function andoperational safety

The flawless functioning of the pH 170 monitor is only guaranteed if attention is paid to the generally accepted safety measures and the special safety instructions in this operating manual during use.

The flawless functioning and operating safety of the pH 170 monitor is only guaranteed under the ambient conditions specified in chapter 8 TECHNICAL DATA.

Safe operation Assuming that risk-free operation is no longer possible, take the pH 170 monitor out of operation and secure it against unintentional operation. Risk-free operation is no longer possible if the pH 170 monitor:

has been damaged in transport

has been stored under adverse conditions for a lengthy period of time

is visibly damaged

no longer operates as described in this manual.

If in doubt, contact the supplier of the pH 170 monitor.

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3 Installation

3.1 Onsite installation: General instructions

The measurement location must meet the environmental conditions specified in chapter 8 TECHNICAL DATA.

Outdoor mounting Pay attention to the following points for outdoor installations:

Always protect instruments installed outdoors against rough weather conditions with a protective cover.

Close the housing cover after installation to ensure tightness (IP 66).

Also seal all unrequired cable glands with matching dummy plugs.

Installation on a wall orunder a protective cover

The instrument is mounted on a wall or under a protective cover through 4 boreholes in the rear panel of the housing. The boreholes are accessible when the housing cover is open.

Fig. 3-1 Mounting boreholes of the pH 170

The clearances of the boreholes are given in the dimensional drawing in the chapter 8 TECHNICAL DATA. For wall mounting, use the suitable material (screws, wall plugs, etc.).

- + -

i h g f e dcbaRec2 L1NK2K1

RSOption

Sensor/Probe Rec1NetzMains

cOption

b a

+

X2 X1

13 12 11 1110 109 98 87 76 65 54 43 32 21 1

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3.2 Electrical terminal strip

The terminal strip of the pH 170 is accessible after the housing cover has been opened:

Fig. 3-2 pH 170 terminal strip inside the housing

The red switch on the PCB of the pH 170 is used as the selector switch for the sensor input:

OFF (factory setting) = sensor input jack

ON = terminal strip.

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Terminal connections

* Connection of monitors with 24 V DC supply voltage:

– N = GND

– L1 = +24 V DC

No. X1 X2

1 RS 485 A (RS option) Current output REC1+

2 RS 485 B (RS option) Current output REC1-

3 RS 485 GND (RS option) Current output REC2+(RT option)

4 SensCheck relay Current output REC2-(RT option)

5 SensCheck relay a / Sensor

6 Relay K1 (RT option) b / Sensor

7 Relay K1 (RT option) c / Sensor

8 Relay K2 (RT option) d / Sensor

9 Relay K2 (RT option) e / Sensor

10 N (mains) * f / Sensor

11 L1 (mains) * g / Sensor

12 - h / Sensor

13 - i / Sensor

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3.3 Electrical connection

3.3.1 General installation instructions

Pay attention to the following points when connecting cable wires to the terminal strip:

Shorten all the wires to be used to the length required for the installation

Fit all wires with wire sleeves before connecting to the terminal strip

Any wires that are not used and project into the housing must be cut off as closely as possible to the cable gland. Seal all open cable glands with matching blind plugs.

WARNINGFree wires must not protrude into the housing of the pH 170. Danger of short-circuit and fire! Touch-proof circuits can also come into contact with dangerous voltages if touched and lead to life threatening situations when working with the pH 170. Always cut off any unused wires as closely as possible to the cable gland.

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3.3.2 Line power connection

WARNINGIf the power supply is connected incorrectly, it may represent a danger to life from electric shock. Pay attention to the following points during installation:

The monitor must only be connected by an electrician.The monitor must only be connected in a voltage-free condition.The power supply must fulfill the specifications given on the nameplate and in chapter 8 TECHNICAL DATA.

A switch or circuit breaker must be provided in the building installation as an interrupt facility for the monitor. The interrupt facility must be– installed close to the monitor and easy to reach by the user

and

– marked as an interrupt facility for the monitor.

The monitor must only be opened after installation if the mains voltage has been switched off beforehand.

The correct voltage is given on the nameplate (see section 1.3 NAMEPLATE). In all cases check that the correct mains voltage is present prior to installing the instrument.

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3.3.3 Relay contacts and current outputs

WARNINGIf external electrical circuits that are subject to the danger of physical contact are incorrectly connected to the relay contacts, there may be a danger of life threatening electric shock. Electrical circuits are regarded to be subject to the danger of physical contact when there are voltages higher than the Safety Extra Low Voltage (SELV).Pay attention to the following points during installation:

Electrical circuits subject to the danger of physical contact must only be connected by a qualified electrician.Electrical circuits subject to the danger of physical contact must only be connected when they are voltage-free.Switching voltages and switching currents on the relay contacts must not exceed the values specified in chapter 8 TECHNICAL DATA. Protect electrical circuits against currents that are too high with an electrical fuse.After the monitor has been installed, it may only be opened if the mains voltage and all external voltages have been switched off beforehand.

An overview of the relay and current outputs of the individual instrument versions can be found in section 1.2 OUTPUTS AND INTERFACES. The configuration and parameterization is described in sections 4.4 to 4.5.

3.3.4 RS 485 digital interface (RS option)

NoteThe connection of the monitor to other instruments via the RS 485 interface is described in detail in a separate manual that accompanies the RT RS instrument versions.

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3.4 Connecting the sensors

3.4.1 Sensor types and connection options

NoteOrdering information on the respective articles (connection cables, adapters, terminal boxes etc.) is given in chapter 7 ACCESSORIES.

Cable extension The following terminal boxes can be used for the cable extension between the sensor/electrode and monitor:

KI/S: Passive terminal box for sensors with integrated preamplifier and plug adapter at the connection cable

KI/pH 170: Active terminal box for sensors without integrated preamplifier (high-impedance electrodes) but with separate temperature probe.

The maximum cable length between the electrode and monitor including the length of the sensor connection cable is 100 m.

NoteThe wiring is described in the mounting instructions of the respective terminal box.

Sensor/electrode Connection type Connection cable/ adapter

Seepage

SensoLyt® 690SensoLyt® 700SensoLyt® 700 (SW)

(armatures with integrated preamplifier)

Connect the plug adaptor of the sensor connection cable with the sensor input jack

- 96

SensoLyt® 650 Connect the open wire ends of the sensor connection cable with the terminal strip

- 97

PL 81-225pHT VPPL 82-225pHT VP

Connect the open wire ends of the respective sensor connection cable with the terminal strip.

VP6-19/xx 98

PL 80-120pHPL 80-225pHPL 89-225PtSensoLyt® DWSensoLyt® ECSensoLyt® PtSensoLyt® SE

AS 9-HI-xx 99

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3.4.2 Connecting the SensoLyt® 690 or 700 (SW)

The SensoLyt® 690 or 700 (SW) armatures have a permanently mounted connection cable with a 7-pin plug adapter.

Connection Connect the plug adapter of the sensor connection cable with the sensor input jack of the monitor:

Fig. 3-3 Connection of SensoLyt® armatures with integrated preamplfier.

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pH

SensoLyt® 690SensoLyt® 700 (SW)

NoteThe red switch (see Fig. 3-2 on page 90) on the PCB of the monitor must be set to OFF (already set in the factory).

pH 170

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3.4.3 Connecting the SensoLyt® 650

The SensoLyt® 650 armature has a permanently mounted connection cable with preassembled, open wire ends. Connect the wire ends with the terminal strip of the monitor according to the wiring table:

Wiring table

The terminal strips are described in section 3.2.

NoteThe following instructions must be followed when connecting the pH 170 monitor:

The red switch (see Fig. 3-2 on page 90) on the PCB of the monitor must be set to ON stehen

Cut off any unused wires that project into the housing as close as possible to the cable gland

Seal all open cable glands with matching blind plugs.

Wire color,SensoLyt® 650

Connection monitorTerminal strip X2 ("Sensor/Probe")

- 5

- 6

- 7

White 8

- 9

Brown 10

Yellow + green 11

Transparent 12

- 13

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3.4.4 Connecting the PL 81/82...

The electrode is connected to the monitor by means of the VP 6-19/xx connection cable (previous model VP6-ST/xm). Connect the pre-assembled, open wire ends of the connection cable with the terminal strip of the monitor according to the wiring table:

Wiring tablePL 81-225pHT VP

* Bridge the connections 8 and 9 with a piece of wire

Wiring tablePL 82-225pHT VP


Wire colorVP 6-19/xx (VP6-ST/xm)


- 5

- 6

- 7

White 8+9 *

Gray or brown (unused, see note below)

Green 10

Copper + yellow/green 11

Transparent or white(inner conductor of the intrained

coaxial cable)

12

- 13

Blue (unused, see note below)

Wire colorVP 6-19/xx (VP6-ST/xm)


- 5

- 6

- 7

White 8

Gray or brown 9

Green 10

Copper + yellow/green 11

Transparent or white(inner conductor of the intrained

coaxial cable)

12

- 13

Blue (unused, see note below)

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The red switch (see Fig. 3-2 on page 90) on the PCB of the monitor must be set to ON stehen



3.4.5 Connecting other electrodes and separate temperature probes

The following description applies to the following electrodes without integrated temperature sensors:

SensoLyt® SE

SensoLyt® EC

SensoLyt® DW

SensoLyt® Pt

PL 80-120pH

PL 80-225pH oder PL 89-225Pt (e.g. in the CHEMTrac 830 M or InTrac® retractable armature)

These electrodes are connected to the monitor by means of the AS 9-HI-xx connection cable (see table on page 95). Connect the shield and inner conductor of the sensor connection cable to the terminal strip of the monitor according to the wiring table:

Wiring table

The connection of the temperature probe depends on the respective switching type (2 oder 3-wire switching). The following types of temperature probes can be used:

NTC (30 kΩ / 25 °C, 2-wire)

Pt 100 (2 and 3-wire)

Pt 1000 (2 and 3-wire)

Wire AS 9-HI-xx Connection monitorTerminal strip X2 ("Sensor/Probe")

Shield 11

Inner conductor 12

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Wiring of thetemperature probe

Fig. 3-4 Connecting the electrode and temperature probe



The red switch (see Fig. 3-2 on page 90) on the PCB of the monitor must be set to ON



- + -i h g f e d

Rec2Sensor/Probe Rec1c b a

+X2

13 12 11 10 9 8 7 6 5 4 3 2 1

- + -

i h g f e dRec2Sensor/Probe Rec1

c b a

+

X2

13 12 11 10 9 8 7 6 5 4 3 2 1

Pt 100, Pt 1000

NTC

pH

/OR

P(r

efe

ren

ce

)p

H/O

RP

(re

fere

nce

)

pH

/OR

P(s

ign

al)

pH

/OR

P(s

ign

al)

2-wire switching:

3-wire switching:

*

* = compensation line (comp)

(for Pt 100/1000 without compen-sation line, bridge the connections 8 and 9 with a piece of wire)

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4 Operation

4.1 Display

Display elements

1 Upper display line:Measured pH value, operator guidance

2 SensCheck symbol

3 Lower display line:Measured temperature value, operator guidance

4 Status displays, depending on instrument status and operating situation

88

881°C

Cal AR

Ident

Auto REL2

Baud

REL1

S

8 8 8

mVpH

TEC

TP

1

2

3

4

pH 170

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4.2 Operating keys

The monitor is operated via the following six keys below the display:

Key functions Key Function

Call up measuring mode<M>

Start calibration (only active in measuring mode)<C>

In measuring mode: Display the sensor slopeConfirm current selection<ENTER>

Leave the menu<ESC>

Increase the value, scroll upwards in the selection,or navigate one menu level upwards<UP>

Decrease the value,scroll downwards in the selection,or navigate one menu level downwards<DOWN>

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4.3 Operating levels and general operating principles

Fig. 4-1 Operating levels

The operation of the monitor is differentiated into three levels:

Operating level In normal measuring mode and during calibration the monitor is in the so-called 'operating level'.

Parameterization level All instrument settings are made in this level (e.g. measuring ranges, limits).

Configuration level The functions of the monitor are defined in this level. The configuration is carried out after the installation of the instrument, mostly only during the initial commissioning.

Password protection All settings of the parameterization and configuration level can be protected with a three-digit numeric code against unauthorized or unintentional modification.

or

1.)

or

or

2.)

OPERATING LEVEL

PARAMETERIZATION LEVEL ( )PA

CONFIGURATION LEVEL ( )Co

(Measurement and calibration)

Parameterizationsettings

Configurationsettings

or viewing only with

3.) Password entry for editing (optional)

n x

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4.4 Configuration

4.4.1 Call up configuration level

Call up the configuration level from the operating level as follows:

NoteIf an incorrect password is entered or after pressing the <ESC> during password entry, access to the configuration is only possible in view mode, i.e.settings can be viewed but not changed.

1 Press <DOWN>.

2 Press <ENTER>.

3 The menu for the password prompt appears.

When delivered, no password protection is set up. In this case proceed to the next operating step by pressing <ENTER> three times.If password protection is set up, the password must be entered in order to change settings. Enter the password as follows:

– Set the first (flashing) digit with <UP><DOWN> and confirm with <ENTER>.

– Set the other two digits in the same way.

4 After the last digit you reach the parameterization level first.

5 Press <UP> or <DOWN>.

You are now at the starting point of the configuration level. From here you can reach the settings with <ENTER> (see section 4.4.2).

C d5 5

o5

AP

oC

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4.4.2 Configuration setting table

General operatinginstructions

The starting point for the settings is the start display of the configuration level (see section 4.4.1):

Operation:

All settings of the following setting table are run through step by step.

Select the desired value from the selection in each case with <UP><DOWN> and confirm this with <ENTER>. After that you reach the next setting.

Certain settings or choices are only available with specific instrument variants or depend on other preceding configuration settings. Settings that are not available will be skipped.

After running through all the settings you again reach the starting point of the configuration level. From here change to the operating level with <M> or <ESC> or go to the parameterization level with <UP><DOWN>.

In view mode you can change to the operating level from any point with <M>.

Swap to the first setting with <ENTER>.

oC

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Setting table:

Setting Selection/Values Explanation (values in bold typeface = values on delivery)

CFu pH

mV

pH or mV/ORP measuring mode.

CCL Auto Cal TEC

Auto Cal TEC rEC1 REL1

Cal

pH calibration process.

This setting only appears if the pH measuring mode is selected.

Heed the status indications on the display:

Auto Cal TEC:Automatic two-point calibration with WTW technical buffer solutions

Auto Cal TEC REC1 REL1:as for Auto Cal TEC but with extra output of the buffer values on current output 1

Cal (=Con Cal):conventional calibration with any buffer solutions.

Note: The calibration processes are described in detail in section 4.7.1 CALIBRATION PROCEDURE.

Ctc Auto TP

TP

Temperature compensation.

Heed the status indications on the display:

Auto TP:Automatic temperature compensation via connected temperature sensor

TP:Temperature compensation via the manually entered temperature.

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CIN 690

700

oth

– ntc – 100

– 1000

Connected sensor type.

After confirming the selection of oth with <ENTER> you can select the type of the temperature probe:


690 SensoLyt® 690

700 SensoLyt® 700 (SW)

oth Other electrodes:

– PL 80-120pH

– PL 80-225pH

– PL 81-225pHT

– PL 82-225pHT

– PL 89-225Pt

– SensoLyt® 650

– SensoLyt® SE

– SensoLyt® EC

– SensoLyt® DW

– SensoLyt® Pt

ntc NTC (30 kΩ), e.g. TFK 150, TFK 325 series

100 Pt 100

1000 Pt 1000

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CR1 rEC pH/mV Measured value range of the REC 2 analog output (pH/mV measured value).

After confirming the reC (pH or mV) selection with <ENTER> the upper and lower final value can be adapted to the analog output.

Operating notes:

– The setting is carried out in the order: upper final value -> lower final value

– Press 1x <ENTER> in between.

The following settings are possible:

pH measuring range 0.00 ... 14.00%:

(step size 1)

Measuring range -1500 ... 1500 mV:

(step size 100 mV)

Note: If the range is exceeded, the recorders output a constant value of 20.5 mA (OFL display). The instrument automatically returns to the defined recorder range when the value is within the range again.


Upper final value: 4 ... 12 ... 14

Lower final value: 0 ... 2 ... 10

Minimum spacing: 4

Upper final value: -500 ... 1500 mV

Lower final value: -1500 ... 0 ... 500 mV

Minimum spacing: 500 mV

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CR2

(only with RT and RT RS option)

rEC °C Measured value range of the REC 2 analog output (temperature value).

After confirming the reC (°C) selection with <ENTER> you can adapt the upper and lower final value.

Operating notes:

– The setting is carried out in the order: upper final value -> lower final value


The following settings are possible depending on the type of the connected temperature probe:

NTC (30 kΩ):

(step size 1 °C)

Pt 100 / Pt 1000:

(step size 1 °C)

Note: If the range is exceeded, the recorders output a constant value of 20.5 mA (OFL display). The instrument automatically returns to the defined recorder range when the value is within the range again.

CRc REL 1/2


nF

PS

FRC

UL.LL

PI

PF

CS

Functions of the freely configurable relays REL 1 and REL 2.

The configuration of these relays is described in detail in section 4.6.1.

The REL 1 or REL2 status display shows for which relay the setting has just been made.

Neither relay has a function when it is delivered (nF).


Upper final value: 25 ... 50 ... 100 °C

Lower final value: -5 ... 0 ... 5 °C

Upper final value: 25 ... 50 ... 130 °C

Lower final value: -20 ... 0 ... 5 °C

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CRF REL 1/2


0

C

Switching behavior of the freely configurable relays REL 1 and REL 2.

"O" (open) = normally closed contact"C" (closed) = normally open contact

The switching behavior indicates the state of the switching contact for an active relay.

This setting only appears if the limit value control (UL.LL) function and frozen measured value (FRC) are set for the relay.



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4.5 Parameterization

4.5.1 Calling up the parameterization level

Call up the parameterization level from the operating level as follows:

NoteIf an incorrect password is entered or after pressing the <ESC> during password entry, access to the parameterization is only possible in view mode, i.e.settings can be viewed but not changed.

1 Press <DOWN>.

2 Press <ENTER>.

3 The menu for the password prompt appears.

When delivered, no password protection is set up. In this case proceed to the next operating step by pressing <ENTER> three times.If password protection is set up, the password must be entered in order to change settings. Enter the password as follows:– Set the first (flashing) digit with

<UP><DOWN> and confirm with <ENTER>.

– Set the other two digits in the same way.

4 After the last digit you reach the starting point of the parameteriza-tion level. From here you can reach the settings with <ENTER> (see section 4.5.2).

C d5 5

o5

AP

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4.5.2 Setting table of parameterization

Overview of the settings(main level)

x Menu appears for the corresponding instrument variant1) For relays that are configured as limit indicators2) For temperature compensation without temperature sensor3) Only appears in mV/ORP measuring mode

General operatinginstructions

The starting point for the settings is the start display of the parameterization level (see section 4.5.1):

Operation:

Navigate in the main level to the next or previous setting with <UP><DOWN>. The entry level with further settings is reached by subsequently pressing <ENTER>.

In the entry level select the desired value from the selection in each case with <UP><DOWN> and confirm this with <ENTER>. This puts the setting into effect and you go to the next setting or return to the main level.

Certain settings or choices depend on the instrument variant or specific configuration settings. Settings that are not available will be skipped.

Display Description

Instrument version

Stan-dard

RT RT RS

Pr1 Current output 1 x x x

Pr2 Current output 2 x x

PL Relay limits 1) x x

PIF RS 485 interface x

PtC Manual temperature entry 2) x x x

PCd Password protection x x x

Prd ORP balancing 3) x x x

Pt Temperature balancing x x x

PCS Timer function x x

Switch to the first setting of the main level with <ENTER>.

AP

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From any point of the main level press <ESC> to return to the starting point of the parameterization level. From here change to the operating level with <M> or <ESC> or to the configuration level with <UP><DOWN>.

From any point of the main level press <M> to also go directly to the operating level.

In view mode you can change to the operating level from any point with <M>.

Setting table:


PR1 4:20

0:20

or

dI:=1 ... dI:20

Current range and attenuation of the REC 1 current output in rEC operating mode (analog output).

Operating notes:

– The setting is carried out in the order: current range -> attenuation


The following values can be set:

Current range:

– 4 to 20 mA, or

– 0 to 20 mA

"dI" = attenuation dI/dt (in mA/s):

– 0.1

– 1

– 5

– 20

Attenuation is the change speed of the current signal in the case of erratic changes of the input signal.

PR2


4:20

0:20

or

dI:=1 ... dI:20

Current range and attenuation of the REC 2 current output in rEC operating mode (analog output).

For setting possibilities, see Pr1 (ReC operating mode).

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PLUL / LLREL 1/2HStD


(depending on the configuration)

Settings for the REL 1 and REL 2 relays configured as limit indicators.

The parameterization of the limit indicator is described in detail in section 4.6.


PIF

(only with RT RS option)

(depending on master/slave operating mode)

Interface parameter (Baud rate, address etc.).

The parameterization of the RS 485 interface is described in a separate manual that is included in the scope of delivery of the instrument variant with RS 485 interface (RT RS option).

PtC -20 ... 130 °C Manual entry of the test solution temperature when measuring without temperature sensor.

Note: Prior to the calibration the determination and entry of the precise temperature of the buffer solutions are required (see section 4.7 PH CALIBRATION).

PCd 000 ... 999 Password against unintentional changes of configuration and parameterization.

000 = password protection is deactivated (state on delivery)

Operating note:


– Set the other digits in the same way.

Notes: After setting up password protection the instrument can only be configured and parameterized after entry of the correct password. The password "555" is not permissible.


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Prd -300 ... 300 mV ORP balancing.

This setting only appears if the mV measuring mode is selected (CFu setting) in the configuration level.

A constant value can be added or subtracted to the measured voltage in this setting.

Carry out the balancing:

– Press <ENTER>.

– The measured voltage (upper display line) can be set to the theoretical value with <UP><DOWN>. When a temperature sensor is connected the lower display line shows the measured temperature value.

The balancing difference can be viewed later at any time (see section 4.8).

Notes: This method can be used to test ORP electrodes with suitable test equipment (e.g. ORP buffer solution RH 28, article no. 109740) and readjust them if necessary. The specified ORP voltage of an ORP buffer solution is usually based on the normal hydrogen electrode (UH). Measurements with ORP electrodes must therefore take the standard voltage of the reference system into consideration (URef).

(continues on the next page)


235mV

2 °C1 0

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The theoretical value for the measured voltage is then:

UTheor = UH - URef

The voltage values of the ORP buffer solution and electrode reference system are given in the respective accompanying documentation. Note that the values are temperature dependent and therefore a temperature measurement is obligatory.

Pt -=5 ... =5 °C Balancing of the measured value of the connected temperature measuring sensor against a reference thermometer.

Notes:

– Due to the thermal capacity of the sensor, it is necessary to place it in a container with at least 2 liters of water.

– Leave the sensor and reference thermometer in the vessel for at least 15 minutes (in the case of temperature differences of more than 10 °C for at least one hour) with occasional stirring so that the temperatures equalize.

Carry out the balancing:

– Press <ENTER>.

– Set the measured temperature value (upper display line) to the value of the reference thermometer with <UP><DOWN>. The lower display line shows the correction value.


1 5=3

(°C-

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PCStr REL 1/2tcth


(depending on the configuration)

Timer settings for relays that are configured as control relays for a sensor cleaning system.

The timer settings are described in detail in section 4.6.



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4.6 Freely configurable relays (RT and RT RS option)

4.6.1 Configuration

Relay functions The two potential-free relays of the RT and RT RS instrument variants can be freely configured.

The following functions are possible:

NoteThe relay functions are selected in the configuration level under the setting Crc (see section 4.4.2).

Function Description

nF (no function) Relay has no function

PS (Power Supply) Monitoring the mains voltage.The relay contact is closed when mains voltage is applied and opens if there is apower failure.

FrC (Freeze) The relay is active when the measured value is frozen, e.g. during a calibration. The relays can be configured as normally closed or normally open.

UL.LL (Limits)ULpH / mVLLpH / mVUL°CLL°C

The relay can be set as an upper or lower limit indicator for both the pH value and for the measured temperature value. It becomes active if a specified limit is exceeded or undercut. The relays can be configured as normally closed or normally open.

A limit indicator is set as follows:

– Press <ENTER>.

– Select the desired option with <UP><DOWN> and then press <ENTER>. Note what appears on the display: UL = upper limitLL = lower limitpH or mV = measuring mode°C = measured temperature value

The specification of the limits and other parameterization of the relay is described in section 4.6.2.

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Switching behavior(normally closed/open)

The relay can be configured as normally closed or open for the functions FrC (Freeze) and UL.LL (limits). The relay works as normally open for all other functions.

NoteThe switching behavior is set in the configuration level (section 4.4.2).

4.6.2 Limit indicator

Basics With a limit indicator, a relay switches when a specified limit value is exceeded or undercut. The switching contact opens or closes according to the selected switching behavior.

Limit indicators can be used in the following way:

Monitoring a limit value using a relay:When a limit value (upper or lower limit value) is exceeded or undercut, a relay switches.

Monitoring two limit values using two relays:If the upper limit value is exceeded or undercut, a relay switches and, if the lower limit value is exceeded or undercut, another relay switches.

PIULpHLLpH

The relay is used as a control output for a proportional controller with pulse width modulation.

Whether an upper (UL) or lower (LL) limit is specified for the control is predefined with UL or LL (for details, see section 4.6.3).

PFULpHLLpH

The relay is used as a control output for a proportional controller with frequency modulation.

Whether an upper (UL) or lower (LL) limit is specified for the control is predefined with UL or LL (for details, see section 4.6.3).

CS (Cleaning System) The relay controls an external sensor cleaning unit. The relay works as a closer (i.e. normally open). During the cleaning process the measured value is frozen.

The parameterization of the relay is described in section 4.6.4.

Function Description

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Example:Monitoring of limit

values with one or tworelays

Fig. 4-2 Switching points of relays working as limit indicators

The selected limit value (UL/LL) is exceeded/undercut.

The hysteresis HS that was set for the limit value is exceeded/undercut. The switching delay td for the limit value is started.

If the limit value including the hysteresis is still exceeded/undercut and the switching delay for the limit value has expired the relay switches.

Time

Measured value

UL

LL

Hysteresis HS1Hysteresis HS1

Relay 1

td2td2

td1

td1

Hysteresis HS2Hysteresis HS2

Relay 2

Relay 2

Time

Relay state

Relay 1

on

on

off

off

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Setting table for limit indicators:

NoteHysteresis and switching delay prevent frequent switching for measured values that are close to the limit value.

Setting Selection/Values Explanation

UL or LL Any within the measurement range

Upper or lower limit.

Setting tolerance according to the measured value display.

Operating note:



HS 0 to 10 % of the measuring range

Hysteresis.

Difference between switching point and limit value, if the measured value moves away from the limit value.

Operating note:



td 00:00 ... 59:59 Switching delay (in Min:Sec).

The time period for which the limit value including the hysteresis must be exceeded before the relay switches.

Operating note:

– Set the seconds (right flashing digits) with <UP><DOWN> and confirm with <ENTER>.

– Then set the minutes (left flashing digits) with <UP><DOWN> and confirm with <ENTER>.

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4.6.3 Proportional control with relay

In a proportional controller a relay periodically switches on and off depending on the measured value. The switching signal (output signal of the controller) can be used as a manipulated variable for a control circuit, e.g. for the control of suitable dosing pumps or valves.

Output signal A switching period of the output signal is made up of the ON time and OFF time. The duration of a switching period is described as period T.

Fig. 4-3 Switching period of a proportional controller

tOn = ON time, tOff = OFF time, T = period

v = (ton / T) * 100 %

v = relative pulse width

The ON and OFF time are changed ("modulated") depending on the position of the measured value. Two different types of modulation are possible:

Pulse width modulation

Frequency modulation

Pulse width modulation In this type of modulation the ON time (tOn) of the output signal is changed according to the measured value. Depending on the position of the measured value, the relay is operated for a longer or shorter time period. The relative pulse width varies between 10 and 90 %. The period can be set to between 5 and 100 s.

Frequency modulation Unlike pulse width modulation, the ON time remains constant in this type of modulation (tOn = 0.3 s). Depending on the position of the measured value, the relay switches on more or less frequently. The switching frequency moves between 0 pulses/min (relay constantly off) and the maximum switching frequency. The maximum switching frequency can be set to between 50 and 120 pulses/min.

TTime [s]

Relay

Off

OntOn tOff

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Control with limits For control with a proportional controller a limit must be specified. This limit can be an upper limit (UL = Upper Limit) or a lower limit (LL = Lower Limit). If the limit is exceeded or undercut, the controller creates a signal (manipulated variable) which is proportional to the deviation from the limit. The signal can be used in a control circuit to counteract the limit violation.

Proportional range

Fig. 4-4 Proportional range in pulse width modulation (example: upper limit)

Fig. 4-5 Proportional range in frequency modulation (example: upper limit)

If the measured value lies below an upper limit or above a lower limit, also in the set range, the controller does not output a signal (relative pulse width or frequency = 0). In the case of a fault that leads to the limit being exceeded or undercut, the controller generates a signal which counteracts the controlling element (dosing pump or valve) of the fault. The relay switches with a relative pulse width or frequency that increases with an increasing gap between the measured value and

Proportionalband

UL

010

50

90100

tOn tOff

50% 50%

10%

10%

90%

90%

Cycleduration T

Time

Pulse width v [%]

Measured value

0

fmax.

fmax.2

Time

50 % of maximumswitching frequency

Maximumswitching frequency(50 ... 120 1/min)

0 1/minUL

Switching frequency f [1/min]

Measured value

Proportionalband

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limit. This range is the proportional range of the controller. If the maximum relative pulse width (90 %) or frequency (variable) is reached, a greater gap between the measured value and limit does not lead to any further increase. The controlling element of the control circuit works with maximum effect (maximum dosing). The controller works outside the proportional range.

NoteProportional controllers have the characteristic that if there is a persistent fault of the control circuit a constant control deviation or offset remains.

Control with two relays

Fig. 4-6 Regulation with 2 relays

Two proportional controllers can be combined so that one controller counteracts the limit violation of an upper limit and the second controller counteracts the limit violation of a lower limit. This enables the measured value to be controlled in such a way that it remains within the selected range defined by the limits (control deviations not taken into account).

Proportional bandsRelais 1 and 2

selectedrange

Measured value

Relay 1 Relay 2

LL UL

max

Pulse width vor switching frequency f

min

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Setting table for proportional controllers - pulse width modulation:

Setting table for proportional controller - frequency modulation:


UL or LL Depending on the measurement range

Limit = measured value for minimum frequency.

Setting range for UL: 0.10 ... 14.00

Setting range for LL: 0.00 ... 13.90

Pro Depending on the measurement range

Proportional range

The setting limits depend on the setting of UL or LL:

tI 5 ... 100 Period T in seconds

Value on delivery: 10 s

Minimum for UL pH 0.10

Maximum for UL 14.00-UL

Minimum for LL pH 0.10

Maximum for LL LL


UL or LL Depending on the measurement range

Limit = measured value for minimum frequency.

Setting range for UL: 0.10 ... 14.00

Setting range for LL: 0.00 ... 13.90

Pro Depending on the measurement range

Proportional range

The setting limits depend on the setting of UL or LL:

tF 50 ... 120 (1/min) Maximum switching frequency

Value on delivery: 70 1/min

Minimum for UL pH 0.10

Maximum for UL 14.00-UL

Minimum for LL pH 0.10

Maximum for LL LL

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4.6.4 Timer for external sensor cleaning system

Function The cleaning function enables the timing of a sensor cleaning system through one relay of the monitor. The relay always works as a closer (normally open).

Setting table for sensor cleaning:

NoteNo calibration is possible during the cleaning process (tc) and the adjustment duration (th). If a cleaning process is due during a running calibration, the start is delayed until the calibration is completed. The starting time of all subsequent cleaning processes is moved back according to the delay.


Tr 1 ... 168 (hours)

Time interval between two cleaning processes

tc 10 ... 300(seconds)

Duration of the cleaning process. During the cleaning process the measured value is frozen.

th 10 ... 900(seconds)

Time for adapting the sensor to the measured medium after the cleaning process. During the adaptation period the measured value is frozen.

Operating notes on setting the numerical values:



– After the last digit you reach the next setting

– After entry of all three values the setting of the sensor cleaning is complete

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4.6.5 Display of the relay states in the operating level

For an active relay the REL 1 or REL 2 status display appears in the operating level. Depending on the selected switching behavior the relay contact is either open or closed.

Fig. 4-7 Display of the relay states in the operating mode

NoteIf a relay is configured as a proportional controller (PI or PF), the status display flashes when the control is active.

82

23°C3

REL18

pH

Relay 1 active Relay 2 inactive

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4.7 pH calibration

4.7.1 Calibration procedure

The following calibration procedures can be selected (see section 4.4.2 CONFIGURATION SETTING TABLE):

Auto Cal TEC Automatic two-point calibration with WTW technical buffer solutions. The pH 2.00 / 4.01 / 7.00 / 10.01 buffer values are available. The buffer set values are automatically detected during the calibration.

Auto Cal TEC rEC1 REL1 As for Auto Cal TEC, but with extra output of the buffer set values on current output REC1.

Con Cal Conventional two-point calibration with 2 buffer solutions (pH 7.0 and any other buffer solution).

NoteThe calibration at pH 10.01 is optimized for the WTW technical buffer solution TEP 10 Trace or TPL 10 Trace. Other buffer solutions can lead to an incorrect calibration. The correct buffer solutions can be found in the WTW catalog or on the Internet.

Temperaturecompensation during

the calibration

The temperature has a major influence on the pH value of a buffer solution and therefore also on the calibration. For this reason measuring the temperature is essential for an exact calibration. When the temperature sensor is connected and automatic temperature compensation is selected, the temperature is automatically determined during the calibration. When manual temperature compensation is selected, the temperature of the buffer solutions is measured with a thermometer and entered. Both buffer solutions must be at the same temperature.

NoteManual entry of the temperature of the buffer solutions has no influence on the manual temperature entry for measurement mode (parameter Pt, see section 4.5.2 SETTING TABLE OF PARAMETERIZATION).

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4.7.2 Auto Cal TEC (rEC1 REL1) calibration routine

NoteThe calibration can be canceled at any time with <M>. The monitor then uses the last valid calibration data for measuring.

1 In the measured value display: Call up the calibration routine with <C>. Ct1 appears.

Note: During the calibration routine the states of all relays and current outputs linked with the measured value are frozen.

In the case of manual temperature compensation the set temperature of the buffer solutions is also displayed in the second line. If necessary, set the temperature with <UP><DOWN>.

2 Rinse the pH electrode and immerse it in the first buffer solu-tion.

3 Press <ENTER>.

The measurement runs until a stable value is reached. The electrode voltage is displayed (AR flashes).

4 Ct2 appears after a stable value is reached.

5 Rinse the pH electrode and immerse it in the second buffer solution.

6 Press <ENTER>.

C t 1

Cal

Auto

TEC

C t 1

Cal

Auto

°C1 5TEC

3

Cal

Auto1 °C5 6

mV

TEC AR

C t 2

Cal

Auto

TEC

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The measurement runs until a stable value is reached. The electrode voltage is displayed (AR flashes).

7 After successful calibration the slope (e.g. -59.1 mV/pH) and the asymmetry (e.g. 3 mV) appear.

Note: The valid ranges for slope and asymmetry are specified in section 4.7.4. Instructions for troubleshooting after a calibration error are also given there (CaL Err).

8 Put the sensor back into the mea-suring position.

9 Press <ENTER>.

The display switches to the normal measured value display.The states of all relays and current outputs linked with the measured pH value again follow the measured value.

4

Cal

Auto

11

8°C5 6

mV

TEC AR

591

Cal

Auto

S

3

mV

TEC

pH/

82

23°C3 8

pH

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Output of the buffer setvalues to REC1 recorder

During the Auto Cal TEC rEC1 REL1 calibration procedure the set values of the buffer solutions used are consecutively output as a current signal on output REC1 for five seconds each following the calibration:

Fig. 4-8 Output of the buffer set values to REC1

NoteIf there is a calibration error (CaL Err), REL1 remains activated and the current value on REC1 is frozen. Instructions for troubleshooting are given in section 4.7.4.

Formulae for conversion:

REL 1

REL 1 pulled upREC 1 frozen

REL 1 pulled upREC 1 frozen

Measuring

Outputbuffer 1

Outputbuffer 2

currentmeasured value

5 s 5 s

tonly ifcalibration is o.k.

REC 1

Start with <C> Finish with <ENTER>

Buffer 1 Buffer 2

Ct1 Ct2

Current range0 to 20 mA:

Current range4 to 20 mA:

][1420][ pHvaluebuffer

pHmAmAI •⎥

⎦

⎤⎢⎣

⎡=

][2014][ mAI

mApHpHvaluebuffer •⎥⎦

⎤⎢⎣⎡=

][1416][4][ pHvaluebuffer

pHmAmAmAI •⎥

⎦

⎤⎢⎣

⎡+=

( )][4][1614][ mAmAI

mApHpHvaluebuffer −•⎥⎦

⎤⎢⎣⎡=

Operation pH 170

132 ba14105e11 11/2010

4.7.3 Con Cal calibration routine

NoteThe calibration can be canceled at any time with <M>. The monitor then uses the last valid calibration data for measuring.

1 In the measured value display: Call up the calibration routine with <C>. ASY appears.

Note: During the calibration routine the states of all relays and current outputs linked with the measured value are frozen.

In the case of manual temperature compensation the set temperature of the buffer solutions is also displayed in the second line. If necessary, set the temperature with <UP><DOWN>.

2 Rinse the pH electrode and immerse it in the first buffer solu-tion (7.0).

3 Press <ENTER>.

4 The pH value of the first buffer solution is set to the selected value corresponding to the temperature with <UP><DOWN>.

5 Press <ENTER>.

The asymmetry is displayed:In the case of manual temperature compensation the set temperature of the buffer solutions is also displayed in the second line.

Cal

ASY

ASY

Cal

°C1 5

5

Cal

61

9°C5 6

pH

3

Cal

mV

pH 170 Operation

133ba14105e11 11/2010

6 Press <ENTER>. SLO appears.

7 Rinse the pH electrode and immerse it in the second buffer solution.

8 Press <ENTER>.

9 The pH value of the second buffer solution is set to the selected value corresponding to the temperature with <UP><DOWN>.

10 After successful calibration the slope (e.g. -59.1 mV/pH) and the asymmetry (e.g. 3 mV) appear.

Note: The valid ranges for slope and asymmetry are specified in section 4.7.4. Instructions for troubleshooting after a calibration error are also given there (CaL Err).

11 Put the sensor back into the mea-suring position.

12 Press <ENTER>.

The display switches to the normal measured value display.The states of all relays and current outputs linked with the measured pH value again follow the measured value.

S L O

Cal

4

Cal

41

0°C5 6

pH

591

Cal

S

3

mV pH/

82

23°C3 8

pH

Operation pH 170

134 ba14105e11 11/2010

4.7.4 Calibration error

The calibration is valid if the values for slope and asymmetry lie within the following ranges:

Calibration is not possible if even one of the values is outside the valid range. The display shows CaL Err after leaving the calibration routine.

Example:

NoteMeasures for troubleshooting are given in section 6 WHAT TO DO IF ....

Slope: -62.0 to -50.0 mV/pH

Asymmetry: -45 to -45 mV

Press <ENTER>.The type of error is displayed:

SLO Err = invalid slope

ASY Err = invalid asymmetry

AR Err = AutoRead error due to unstable measured value.

CE

aLr r

Oxi Cal

Auto

SE

L Or r

Oxi Cal

Auto

AE

SYr r

Oxi Cal

Auto

E

A rr r

Oxi Cal

Auto

pH 170 Operation

135ba14105e11 11/2010

4.8 Display of instrument information

The following information can be called up:

Configuration data. For this, switch to the configuration level. Press <ESC> during the password prompt to view all settings in view mode (see section 4.4.1 CALL UP CONFIGURATION LEVEL).

Parameterization data. For this, switch to the parameterization level. Press <ESC> during the password prompt to view all settings in view mode (see section 4.5.1 CALLING UP THE PARAMETERIZATION LEVEL).

Calibration data

Software version

Viewing the calibrationdata and software

version

To call up the data of the last calibration, press <ENTER> in the measured value display (operating level). The following information appears depending on the measuring mode:

pH: The upper display line shows the slope in mV/pH, the lower one shows the asymmetry in mV:

mV/ORP: The balancing difference (Ucorrected - Uuncorrected) from the ORP balancing is displayed here:

NoteAfter an incorrect calibration (CAL Err) reasons for the cause are display instead of the calibration data (see section 4.7.4 CALIBRATION ERROR).

Swap to the display of the software version (So) with <UP><DOWN>:

O 1 mg/l

Auto

Cal

mg/l

1 3Oxi

%

AR

REL2REL1

Sal°CIdent

Baud

8

Sal 25S

9mV pH/

2

3mV

Operation pH 170

136 ba14105e11 11/2010

Return to the measured value display with <M>.

4.9 Test mode

General information Test mode can be used for the following purposes:

Set specific current values on the current outputs for test purposes

Switch the relays on and off for test purposes (RT and RT RS option)

Check the RS 485 communication (RT RS option)

Test procedure

So3 0 3

1 Keep <ESC> pressed and briefly press <UP> at the same time.

Note: To leave the test mode again at any time, press <M> or <C>.

2 Press <ENTER>.

The set password is displayed ("000" = password protection deactivated).

3 Proceed to the next test item with <ENTER>.

Test of current output 1.

4 Press <ENTER>.

8AR

REL10 0 0

REL2

C od

8AR

REL1 REL2

C od2 31

AR

REL1 REL2C 1er

t st

pH 170 Operation

137ba14105e11 11/2010

A fixed current value can be set on current output 1 here:– Set 0.1 mA with <M>

– Set 20.0 mA with <C>

– Increase or decrease the value as necessary (adjustment range 0.0 to 20.5 mA) with <UP><DOWN>


Test of current output 2 (only for RT and RT RS option).

6 Press <ENTER>.

Here a fixed current value can be set on current output 2:– Set 0.1 mA with <M>

– Set 20.0 mA with <C>

– Increase or decrease the value as necessary (adjustment range 0.0 to 20.5 mA) with <UP><DOWN>


Test the relays (only with RT and RT RS option).

8 Press <ENTER>.

C

AR

REL1 REL2

=1C 1er

AR

REL1 REL2C 2er

t st

C

AR

REL1 REL2

=1C 2er

AR

REL1 REL2r

S tE Lr

t

Operation pH 170

138 ba14105e11 11/2010

The tSt display flashes. Now individual relays can be manually switched on and off:– Switch relay 1 on/off with

<ESC>

– Switch relay 2 on/off with <UP>

– Switch the SensCheck symbol on/off with <DOWN>


Test of the RS 485 communication (RT RS option).

10 Press <ENTER>.

The tSt display flashes. The RS 485 communication test is active.The RS 485 interface works as a repeater, i.e. all received blocks are sent back again.Special commands:– The monitor sends the

instrument identification according to the RS command "RSID" with RS 485 protocol with <ESC>

– The monitor sends the instrument identification according to the RS command RSID" without RS 485 protocol (e.g. for printer output) with <UP>

– Terminate the test with <ENTER>.

11 Return to the operating level with <M>.

rAR

E LrREL1 REL2

S tt

AR

REL1 REL2r

S t8 54

t

AR

REL1 REL2r 8 54

S tt

pH 170 Maintenance and cleaning

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5 Maintenance and cleaning

5.1 Maintenance

The measurement instrument is maintenance free.

5.2 Cleaning

Occasionally wipe the outside of the measuring instrument with a soft, damp cloth.

CAUTIONDo not use high-pressure water blasters for cleaning (danger of water penetration!). Also do not use aggressive cleaning agents such as alcohol, organic solvents or chemical detergents. These types of cleaning agent can attack the surface of the housing.

Maintenance and cleaning pH 170

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pH 170 What to do if ...

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6 What to do if ...

The electrode cannot beactivated

The measurementprovides implausible

measured values

Display OFL

Measured value flashes

ASY Err or SLO Err(calibration error)

Cause Remedy

– Contact problems – Check the electrode connections

– Note immersion depth (diaphragm must be submerged)

Cause Remedy

– Contact problems – Check the electrode connections

– Electrode dirty or defective – Clean the electrode (see electrode operating manual)

Cause Remedy

– The measured pH or temperature value is outside the measuring range

– Check the measurement conditions

Cause Remedy

– Output range of the linked recorder output exceeded

– Adjust the recorder range

Cause Remedy

– Wrong buffer solution used

– Buffer solution contaminated/defective

– Wrong buffer solution used for pH 10

– Check calibration conditions

– Check shelf life of the buffer solutions

– Only ever use the buffer solution once.

– Use the WTW technical buffer solution TEP 10 Trace or TPL 10 Trace for calibration with pH 10.

– Electrode dirty or defective – Clean the electrode (see electrode operating manual)

What to do if ... pH 170

142 ba14105e11 11/2010

Ar Err(calibration error)

Display

The current outputdelivers no current

ErrAoPt

– Fluctuating measured temperature values (when measuring with temperature sensor)

– Immerse temperature sensor in the test solution

– Slope of electrode outside the tolerance (SLO Err)

– Condition electrode

– If the slope remains outside the tolerance, Change electrode

– Slope of electrode too low (SLO Err)

– Change electrode

– Asymmetry of electrode too high (ASY Err)

– Change electrode

– Sensor is operated with ORP electrode (ASY Err)

– Use pH electrode

Cause Remedy

Cause Remedy

– No stable measured value during calibration

– Ensure stable conditions (e.g. temperature)

– Immerse temperature sensor in the test solution

– Check electrode if error recurs

Cause Remedy

– Electrode possibly broken (with SensoLyt® 700 only)

– Check/replace electrode

Cause Remedy

– When wiring with the flow control its switching threshold was undercut

– Check the current output in test mode (see section 4.9).

– Reset the flow-through

Cause Remedy

– Hardware error – Contact WTW

pH 170 Accessories

143ba14105e11 11/2010

7 Accessories

Connection cables andadapters for electrodes

Terminal boxes for cableextension

NoteMore accessories are available in the WTW catalog or on the Internet under www.WTW.com.

Description Model Order no.

Connection cables for electrodes with S7/S8 screw plug head:

Length 1.5 mLength 3.0 mLength 6.0 m

AS 9-HI-1,5AS 9-HI-3,0AS 9-HI-6,0

108 505108 506108 507

Connection cables for electrodes with VP screw plug head:

Length 1mLength 3 mLength 5 mLength 10 m

VP 6-19/01VP 6-19/03VP 6-19/05VP 6-19/10

108 449108 451108 453108 455

Description Model Order no.

Cable EK/170 108 206

Passive terminal box for sensors with integrated preamplifier and plug adapter at the connection cable

KI/S 108 606

Active terminal box for sensors without integrated preamplifier (high-impedance electrodes) and for separate temperature probes.

KI/pH 170 108 596

Accessories pH 170

144 ba14105e11 11/2010

pH 170 Technical data

145ba14105e11 11/2010

8 Technical data

8.1 General data

Dimensions

Fig. 8-1 Dimension drawing of the pH 170 (dimensions in mm)

Test certificates CE

222

105

20

2Side view:

Front view:

Rear view:

ap

pro

x.

23

8

pH 170

82

23°C3 8

pH

198

17

8

Technical data pH 170

146 ba14105e11 11/2010

Mechanicalconstruction

Ambient conditions

Electrical data

Housing material Glass fiber reinforced polycarbonate

Membrane keyboard Polyester

Weight approx. 2.2 kg

Type of protection IP 66

Temperature

Operation - 25 °C ... + 55 °C (- 13 ... 131 °F)

Storage - 25 °C ... + 65 °C (- 13 ... 149 °F)

Relative humidity

Yearly average ≤ 90 %

Dew formation Possible

Supplyvoltage

Protective class II

Overvoltage category II

Power consumption Maximum approx. 18 W

Nominal voltage (depending on variant):

230 V AC (-15 % + 10 %)

115 V AC (-15 % + 10 %)

24 V AC (-15 % + 10 %)

24 V DC (-30 % + 20 %)

AC frequency: 48 - 62 Hz

Connection: 2 pin


147ba14105e11 11/2010

Electrical connections

Fig. 8-2 Terminal strip

Connection technique

Relays

- + -

i h g f e dcbaRec2 L1NK2K1

RSOption

Sensor/Probe Rec1NetzMains

cOption

b a

+

X2 X1

13 12 11 1110 109 98 87 76 65 54 43 32 21 1

Connections – 7-pin sensor input jack on the underside of the housing

– Screwless plug-in connections in the housing using cable glands

Connection cross section

0.5 ... 2.5 mm2

Cable feeds 4 cable glands PG 13,5 / terminal range 10 ... 14 mm

Relay contacts Galvanically separated

Max. switching voltage 250 V AC or 30 V DC

Max. switching current 5 A (AC and DC)

Max. switching power 150 W (resistive load)

SensCheck relay Normally open, switches on sensor damage (broken glass)

Relays K1 and K2 (RT and RT RS option)

Programmable as:

– Signaling relay for failure of supply voltage

– Signaling relay for "frozen" outputs

– Limit monitor

– Proportional controller with pulse width modulation

– Proportional controller with frequency modulation

– Timer

Switching behavior adjustable


148 ba14105e11 11/2010

Current outputs

Digital interfaces 1x RS 485 (RS option)

EMC product andsystem characteristics

Instrument safety

Output Galvanically separated from the sensors

Current range Adjustable:

– 0 - 20 mA

– 4 - 20 mA

Accuracy 0.1 % of current value ± 50 µA, load max. 600 Ω

Functions – 1 x Analog output for measured pH/mV value

– 1 x Analog output for measured tempera-ture value (RT and RT RS option)

Attenuation adjustable

EN 61326 EMC requirements for electrical resources for control technology and laboratory use

– Interference immunity according to EN 61326/A1 Table A.1

– Resources for industrial areas, intended for indispensable operation

– Interference emission limits for resources of class B

System lightning protection

Extended protective characteristics as opposed to EN 61326/A1 Table A.1

FCC, class A

Applicable norms – EN 61010-1


149ba14105e11 11/2010

8.2 Measurement characteristics

8.2.1 pH/mV Measurement

Calibration procedure

Temperaturecompensation

Automatic with connected temperature sensor or manually by entry

Reference temperature 25 °C

Automatic sensormonitoring

(SensCheck function)

Function for broken glass recognition with SensoLyt® 700 (SW)

8.2.2 Temperature measurement

Automatic measurementwith temperature sensor

Manualtemperature entry

Measuring ranges,resolutions

Variable Measuring range Resolution Accuracy

pH 0.00 ... +14.00 0.01 ± 0.01 ± 1 digit

U [mV] -1500 ... +1500 1 ± 2 ± 1 digit

Auto Cal TEC Automatic two-point calibration with WTW Technical buffer solutions, optional with out-put of the buffer values at current output 1 (function, Auto Cal TEC REC1 REL1)

Con Cal Conventional calibration with any buffer solu-tions

Connectable temperature probe

– NTC (30 kΩ / 25 °C, 2-wire)

– Pt 100 (2 and 3-wire)

– Pt 1000 (2 and 3-wire)

Measuring range -20.0 ... +130.0 °C

Resolution 0.1 K

Accuracy 0.1 K ± 1 digit

Adjustment method Manual via comparative measurement of ± 0.5 K

Entry range -20 ... +130 °C

Step size 1 K


150 ba14105e11 11/2010

FCC Class A Equipment Statement

Note: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.Changes or modifications not expressly approved by the manufacturer could void the user‘s authority to operate the equipment.

pH 170 Indexes

151ba14105e11 11/2010

9 Indexes

This chapter provides additional information and orientation aids.

List of display abbreviations (see section 9.1)

Definition of terms (see section 9.2)

Index (see section 9.3)

9.1 Display abbreviations

Configuration

Parameterizationof main level

Cod Password

C0 Starting point of the configuration level

CFu Measuring mode (pH or mV/ORP)

CCL Calibration procedures

Ctc Temperature compensation

CIN Sensor type

CR1 Current output 1

CR2 Current output 2

rEC Analog output

Crc Relay function

nF No function

PS Mains voltage monitoring

FRC Signaling relay with "frozen" output

UL.LL Limit monitor

PI Proportional controller (relay) with pulse width modulation

PF Proportional controller (relay) with frequency modulation

CS Cleaning system

CrF Relay switching behavior

PA Starting point of the parameterization level

Pr1 Current output 1

Pr2 Current output 2

PL Limit monitor

PIF RS 485 interface

PCd Password

Indexes pH 170

152 ba14105e11 11/2010

Parameterizationof

relay

Parameterizationof current outputs

Calibration

Miscellaneous

Prd ORP shift

Pt Temperature adjustment

PCS Cleaning system

PI Pulse width modulation

PF Frequency modulation

UL Upper limit

LL Lower limit

HS Hysteresis

td Switching delay

Pro Proportional range

tI Period

tF (Max.) Switching frequency

Pro Proportional range

Tr Cleaning interval

tc Cleaning duration

th Adjustment duration

dI Attenuation

ct1 Technical buffer solution (first calibration point)

ct2 Technical buffer solution (second calibration point)

ASY Asymmetry (first calibration point Con Cal)

SLO Slope (second calibration point Con Cal)

CALERr

Calibration error

SLOERr

Invalid slope

ASYERr

Invalid asymmetry

Ar ERr

Auto read error

So Software version

tst Test mode

pH 170 Indexes

153ba14105e11 11/2010

9.2 Glossary

The glossary briefly explains the meaning of the specialist terms. However, terms that should already be familiar to the target group are not described here.

Adjusting To manipulate a measuring system so that the relevant value (e.g. the displayed value) differs as little as possible from the correct value or a value that is regarded as correct, or that the difference remains within the tolerance.

Asymmetry Designation for the offset potential of a pH electrode. It is the measurable potential of a symmetrical electrode, the membrane of which is immersed in a solution with the pH of the nominal electrode zero point (WTW electrodes: pH = 7).

Auto Read (AR) WTW name for a function to check the stability of the measured value.

Calibration Comparing the value from a measuring system (e. g. the displayed value) to the correct value or a value that is regarded as correct. Often, this expression is also used when the measuring system is adjusted at the same time (see Adjusting).

Electrode zero point The zero point of a pH electrode is the pH value at which the electromotive force of the pH electrode at a specified temperature is zero. Normally, this is at 25 °C.

Electromotive force of an electrode

The electromotive force U of the electrode is the measurable electromotive force of an electrode in a solution. It equals the sum of all the galvanic voltages of the electrode. Its dependency on the pH results in the electrode function which is characterized by the parameters, slope and zero point.

Junction The junction is a porous body in the housing wall of reference electrodes or electrolyte bridges. It provides the electrical contact between two solutions and makes the electrolyte exchange more difficult. The expression 'junction' is also used for ground or junction-less transitions.

Measured parameter The measured parameter is the physical dimension determined by measuring, e.g. pH, conductivity or D.O. concentration.

Measured value The measured value is the special value of a measured parameter to be determined. It is given as a combination of the numerical value and unit (e.g. 3 m; 0.5 s; 5.2 A; 373.15 K).

Measuring system The measuring system comprises all the devices used for measuring, e.g. meter and sensor. In addition, there is the cable and possibly an amplifier, terminal strip and armature.

Indexes pH 170

154 ba14105e11 11/2010

Offset potential The measurable potential of a symmetrical electrode, the membrane of which is immersed in a solution with the pH of the nominal electrode zero point. The asymmetry is part of the offset potential.

ORP voltage The ORP is caused by oxidizing or reducing substances dissolved in water if these substances become effective on an electrode surface (e.g. a gold or platinum surface).

pH value The pH is a measure of the acidic or basic effect of an aqueous solution. It corresponds to the negative decadic logarithm of the molal hydrogen ions activity divided by the unit of the molality. The practical pH value is the value of a pH measurement.

Potentiometry Name of a measuring technique. The signal (depending on the measured parameter) of the electrode is the electrical potential. The electrical current remains constant.

Reset Restoring the original condition of all settings of a measuring system.

Resolution Smallest difference between two measured values that can be displayed by a measuring instrument.

SensCheck WTW function for the automatic recognition of a sensor defect (e.g. broken glass of a pH electrode).

Slope The slope of a linear calibration function.

Temperature compensation

Name of a function that considers the temperature influence on the measurement and converts it accordingly. Depending on the measured parameter to be determined, the temperature compensation functions in different ways. For conductimetric measurements, the measured value is converted to a defined reference temperature. For potentiometric measurements, the slope value is adjusted to the temperature of the test sample but the measured value is not converted.

Temperature function

Name of a mathematical function expressing the temperature behavior of a test sample, a sensor or part of a sensor.

Test sample Designation of the test sample ready to be measured. Normally, a test sample is made by processing the original sample. The test sample and original sample are identical if the test sample was not processed.

pH 170 Index

155ba14105e11 11/2010

9.3 Index

AAmbient conditions .................................146Authorized use .........................................88Auto Cal TEC (rEC1 REL1) calibration routine 129

CCon Cal calibration routine ......................132Configuration level .................................103Current output

Attenuation ......................................113Current range ...................................113Operating mode ...............................108

DDimensions ...........................................145Display calibration data ..................135, 136Display software version .........................136

EElectrical data ........................................146EMC characteristics ...............................148

IInstrument test (test mode) .....................136Instrument versions ..................................84Interface parameters ..............................114

LLimit indicator (relay)

Basics .............................................119Hysteresis ........................................121Limits ..............................................121Switching delay ................................121

NNameplate ...............................................85

OOperating level ......................................103Operational safety ....................................88ORP balancing ......................................115Outdoor mounting ....................................89

PParameterization level ........................... 103Password

Entry ....................................... 104, 111Setting ............................................ 114

PROFIBUS connection ............................ 85Proportional controller (relay)

(Maximum) Switching frequency ....... 125Basics ............................................. 122Frequency modulation ...................... 122Limit ............................................... 125Period ............................................. 125Proportional range ................... 124, 125Pulse width modulation .................... 122

RRelay

Display on the measured value display ....127Function .......................................... 109Monitoring "measured value frozen" .. 118Monitoring the mains voltage ............ 118Switching behavior ........................... 110

RS 485 ................................................... 85

SSafe operation ........................................ 88SensCheck relay ..................................... 84Sensor cleaning

Adjustment duration ......................... 126Cleaning duration ............................. 126Cleaning interval .............................. 126Function .......................................... 126

Sensor type .......................................... 107Setting table

Configuration ................................... 106Parameterization (main level) ........... 113Parameterization for sensor cleaning . 126Parameterization of limit indicators .... 121Parameterization of proportional controller (PF) ................................................ 125Parameterization of proportional controller (PI) ................................................. 125

Special user qualifications ........................ 87Supply voltage ...................................... 146

Index pH 170

156 ba14105e11 11/2010

TTemperature measurement

Balancing ........................................ 116Temperature sensor

Selection ......................................... 107Terminal strip

Overview ........................................... 90

Wissenschaftlich-Technische Werkstätten GmbH

Dr.-Karl-Slevogt-Straße 1D-82362 Weilheim

Germany

Tel: +49 (0) 881 183-0+49 (0) 881 183-100

Fax: +49 (0) 881 183-420E-Mail: [email protected]: http://www.WTW.com

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