AK101 and AK104 Gas analyzer systems for Hydrogen-cooled ......This is the hydrogen purity...

User Guide IM/AK1/14 Rev. F

AK101 and AK104Gas analyzer systems for Hydrogen-cooled alternators

The CompanyWe are an established world force in the design and manufacture of measurement products for industrial process control, flow measurement, gas and liquid analysis and environmental applications.

As a part of ABB, a world leader in process automation technology, we offer customers application expertise, service and support worldwide.

We are committed to teamwork, high quality manufacturing, advanced technology and unrivalled service and support.

The quality, accuracy and performance of the Company’s products result from over 100 years experience, combined with a continuous program of innovative design and development to incorporate the latest technology.

EN ISO 9001:2000

Cert. No. Q 05907

EN 29001 (ISO 9001)

Lenno, Italy – Cert. No. 9/90A

Stonehouse, U.K.

Electrical SafetyThis equipment complies with the requirements of CEI/IEC 61010-1:2001-2 'Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use'. If the equipment is used in a manner NOT specified by the Company, the protection provided by the equipment may be impaired.

SymbolsOne or more of the following symbols may appear on the equipment labelling:

Warning – Refer to the manual for instructions Direct current supply only

Caution – Risk of electric shock Alternating current supply only

Protective earth (ground) terminal Both direct and alternating current supply

Earth (ground) terminalThe equipment is protected through double insulation

Information in this manual is intended only to assist our customers in the efficient operation of our equipment. Use of this manual for any other purpose is specifically prohibited and its contents are not to be reproduced in full or part without prior approval of the Technical Publications Department.

Health and Safety

To ensure that our products are safe and without risk to health, the following points must be noted:

1. The relevant sections of these instructions must be read carefully before proceeding.

2. Warning labels on containers and packages must be observed.

3. Installation, operation, maintenance and servicing must only be carried out by suitably trained personnel and in accordance with the information given.

4. Normal safety precautions must be taken to avoid the possibility of an accident occurring when operating in conditions of high pressure and/or temperature.

5. Chemicals must be stored away from heat, protected from temperature extremes and powders kept dry. Normal safe handling procedures must be used.

6. When disposing of chemicals ensure that no two chemicals are mixed.

Safety advice concerning the use of the equipment described in this manual or any relevant hazard data sheets (where applicable) may be obtained from the Company address on the back cover, together with servicing and spares information.

1

1 INTRODUCTION .......................................................... 2

2 DESCRIPTION.............................................................. 32.1 Model 6553 Display unit ..................................... 3

2.1.1 Range Display ....................................... 32.2 Model 006540203 or 006548000

Katharometer Analyzer Panel .............................. 42.3 Model 4234 500/4234 501

Power Supply Units (PSU) ................................... 42.4 Remote Indicator/Controllers .............................. 4

3 PREPARATION ............................................................. 53.1 Identification ....................................................... 5

3.1.1 Model 6553 Display unit ........................ 53.1.2 Model 006540 203 or 006548 000

Katharometer Analyzer Panel ................ 53.1.3 Model 4234 Power Supply Unit ............. 63.1.4 AK100 Ordering Information .................. 7

4 MECHANICAL INSTALLATION .................................... 84.1 Locating and Mounting System Items ................. 8

4.1.1 Model 6553 Display Unit ....................... 84.1.2 Katharometer Analyzer Panel ................ 94.1.3 Model 4234 Power Supply Unit ............. 94.1.4 Cubicle Mounted System .................... 10

4.2 Sample Gas Interconnections ........................... 11

5 ELECTRICAL INSTALLATION .................................... 125.1 Electrical Interconnections ................................ 12

5.1.1 Model 6553 Display Unit ..................... 135.1.2 Model 006540 203 and 0065480 00

Katharometer Analyzer Panel .............. 175.1.3 Model 4234 Power Supply Unit ........... 18

5.2 Intrinsically Safe Requirements .......................... 195.2.1 Cable Requirements ............................ 195.2.2 Recommended Cables ....................... 195.2.3 Installing Remote Ancillary Items ......... 195.2.4 Full Intrinsically Safe Requirements ...... 19

6 SETTING UP............................................................... 206.1 Katharometer Analyzer Panel –

Filling the Drying Chamber ................................ 206.2 Setting Sample Flow ......................................... 206.3 Electrical Checks .............................................. 21

6.3.1 Power Supply Unit Output ................... 216.3.2 Zener Diode Safety Barrier Devices ..... 216.3.3 Checking System Earth ....................... 21

7 CONTROLS & DISPLAYS .......................................... 227.1 Displays ............................................................ 227.2 Switch Familiarization ........................................ 22

8 START-UP ................................................................... 238.1 Instrument Start-Up .......................................... 238.2 Alarm Set Point ................................................. 23

8.2.1 Type of Alarm Action ........................... 238.2.2 Hydrogen alarm Set Point ................... 23

8.3 Electrical Calibration ......................................... 238.4 Gas Calibration ................................................. 23

8.4.1 Introduction ......................................... 238.4.2 Purge Gas ........................................... 238.4.3 Hydrogen ............................................ 24

9 OPERATION ............................................................... 259.1 Normal .............................................................. 25

9.1.1 Purging of Hydrogen Coolant Gas ....... 259.1.2 Filling with Hydrogen Coolant Gas ....... 25

9.2 Range 1 Operating Page .................................. 269.3 Range 2 Operating Page .................................. 269.4 Range 3 Operating Page .................................. 26

10 PROGRAMMING ........................................................ 2710.1 Range 1 ............................................................ 30

10.1.1 Access to Secure Parameters ............. 3010.1.2 Language Page ................................... 3010.1.3 Set Up Outputs Page .......................... 3010.1.4 Electrical Calibration Page ................... 32

10.2 Range 2 ............................................................ 3310.2.1 Access to Secure Parameters ............. 3310.2.2 Language Page ................................... 3310.2.3 Set Up Outputs Page .......................... 3310.2.4 Electrical Calibration Page ................... 35

10.3 Range 3 ............................................................ 3610.3.1 Access to Secure Parameters ............. 3610.3.2 Language Page ................................... 3610.3.3 Set Up Outputs Page .......................... 3610.3.4 Electrical Calibration Page ................... 38

11 MAINTENANCE .......................................................... 3911.1 General Maintenance ........................................ 39

11.1.1 Pressure .............................................. 3911.1.2 Flow .................................................... 3911.1.3 Leaks .................................................. 3911.1.4 Vibration.............................................. 3911.1.5 Contamination ..................................... 3911.1.6 Ambient Temperature .......................... 3911.1.7 Bridge Current .................................... 39

11.2 Diagnostic Tests ............................................... 3911.2.1 Checking Output of the PSU ............... 3911.2.2 Checking Integrity of Zener

Diode Safety Barrier Devices ............... 3911.2.3 Checking the Katharometer Output .... 39

11.3 Routine Maintenance ........................................ 3911.3.1 Hydrogen Katharometer

Calibration ........................................... 3911.3.2 Purge Gas Katharometer

Calibration ........................................... 4011.3.3 Changing Desiccant in

Drying Chamber .................................. 4011.4 Repair Maintenance .......................................... 40

11.4.1 Removing Liquid from KatharometerMeasurement Block ............................ 40

11.4.2 Removal/Replacementof an Indicator Unit .............................. 41

11.4.3 Error Messages ................................... 41

12 SPARE PARTS LIST ................................................... 4112.1 Consumables ................................................... 4112.2 Routine Maintenance Parts ............................... 4112.3 Repair Maintenance Parts ................................. 41

13 SPECIFICATION ......................................................... 42

CONTENTS

14 CE DECLARATION OF CONFORMITY...................... 44

2

2&1stnemdnemA+7991:41005NE4991:02005NE

stinUretemorahtaK845600&935600tinUylppuSrewoP105/0054324

tinUlortnoC/yalpsiD3556

9991:48205NE stinUretemorahtaK845600&935600

0891:93005NE metsyS

Caution. This operating manual applies only to thosesystems that have been designed and constructed tothe standards specified in the schedules of the ATEXcertificates listed. The separate units to which thesecertificates apply are clearly identifiable by modelnumbers and the data on the identification and ATEXcertification labels fixed to them. Other combinations ofsimilar equipment built to any earlier specifications arenot covered by BASEEFA certificate numberBAS Ex 01E2044. This is particularly important wherenew replacement units are to be incorporated intoexisting installations covered by any earlier certificationstandards. If in any doubt about the installation ofparticular combinations of certified equipment, contactthe Company for advice before proceeding.

It is essential that units are installed strictly inaccordance with the appropriate standards forelectrical equipment for use in flammable atmospheres.Any deviation from the specified installation conditions,or any unauthorized repairs or adjustments caninvalidate the safety assurances given by thecertification of the unit.

The ultimate responsibility for any particular installation lies withthe installing user/contractor.

This manual gives the installation, operating and maintenanceinformation for the Company's Models AK101 & AK104Intrinsically Safe Gas Analyzer Systems, normally used withhydrogen-cooled electrical power generators.

The complete AK100 Analyzer system uses a combination ofthree different units. Each unit is certified independently for useas part of an intrinsically safe system to meet the standards ofthe ATEX directive 9/94/EC for use in association with Group IIC(hydrogen) hazardous atmospheres in accordance with thefollowing standards:

The different units of the system are:

1) Model 6553 Display Unit, available in several options. Theinputs to the unit are certified to code [EEx ia] IIC Tamb= –20to 40°C under BAS 01 ATEX 7043 certificate with the unitinstalled in the safe area only.

2) Model 006539-960K (or J) and 006548-001 KatharometerUnits that form part of an intrinsically safe Model 006540-203 and 006548-000 Katharometer Analyzer Panel. Theseunits are certified to code EEx ia IIC T4 Tamb= –20 to 55°Cunder BAS 01 ATEX 1042 certificate for installation in thehazardous area (ZONE 0).

3) Model 4234 500 and Model 4234 501 constant currentPower Supply Unit, that provide the supply for oneKatharometer Unit. These power supply units have theiroutput certified to code [EEx ia] IIC Tamb= –20 to 55°C underBAS 01 ATEX 7041 certificate for installation in the safe areaonly.

If further information or assistance is required, contact ourspecialist staff at one of the addresses on the back cover of thismanual. Specialist training courses can also be arranged at ourTraining Centre.

1 INTRODUCTION

3

98.8H2–CO2

UIIN O N S E

Hydrogen Purity

& Purge Gas Monitor

Range

Range SelectorSwitch

DigitalDisplayIndicators 1

2

3

Zero

Zero

F1

AK101

All the various system options comprise one or more of thefollowing units with the further option of fitting the display unitsand power supply units in a cubicle.

2.1 Model 6553 Display UnitThe display unit must be mounted in a safe area and is suitablefor panel mounting or installation into a control cubicle. The unithouses one or two Model 4689 digital display, each equippedwith protected access for zero adjustment, Model AK101 isequipped with a range selector switch – see Fig. 2.1. ModelAK104 is a single display for Hydrogen purity and as suchrequires no range change selector switch.

2.1.1 Range DisplayA selector switch for each display provides independentparameter selection as follows:

Position (1) Percentage of Hydrogen in Air by volume.Displayed on the upper display.This is the hydrogen purity measurement of thecoolant gas during normal operation of thesystem. The display covers a range of 85 to 100%or 80 to 100% hydrogen in air depending on therange selected. An alarm output and aretransmission signal (4 to 20mA) are provided.

Position (2) Percentage of Hydrogen in Purge gas* by volume.Displayed on the upper display.This range is for use in hydrogen filling or purgingoperation. Alarm output and a valueretransmission signal (4 to 20mA) are provided.

Position (3) Percentage of Air in Purge gas* by volume.This range is for use in purge gas filling or purgingoperations. Alarm output and a valueretransmission signal (4 to 20mA) are provided.

Each display defaults to NOT IN USE when not selected.

A further option of providing remote indication of range selectorswitch may be available, depending on the number of alarmsspecified.

The 4689 Display Units provide software specific to thekatharometer systems with relay action of the alarms fixed as'fail safe'. All user-programmable data can be protected fromunauthorized alteration by a programmable 5-digit securitynumber.

The zero adjustments on the front panel of the 4689 enableremote zeroing of the katharometers mounted in the hazardousarea. The adjustment access for a particular display is adjacentto the display and at the same level.

The 4689 has a protective case that can be removed for accessto the interior without removing the whole unit from the controlpanel.

The 4689 also contains encapsulated zener diode safety barrierdevices to limit the electrical energy that can be supplied fromthe instrument circuits into the hazardous area. These devicesare located below the display units, on a rail that MUST beearthed (grounded). A metal screening arrangement segregatesthe connections made to equipment in the hazardous area. Theunit is protected on the mains input side by two fuses, one foreach circuit, accessible from the front of the panel.

2 DESCRIPTION

Fig. 2.1 Model 6553 Display Monitor

UIIN O N S E

Hydrogen Purity

Monitor

DigitalDisplayIndicator

Zero

F1

AK104

*Note. Purge gas options include:CO2 (Carbon dioxide)N2 (Nitrogen)Ar (Argon)

4

ElectricalInterconnections

Flow Gauge

Gas SampleOutlet

Local ZeroAdjustment

Drying Chamber

KatharometerUnit Case

MeteringValve

GasSample

Inlet

2.2 Model 006540203 or 006548000Katharometer Analyzer Panel – Fig. 2.2Each panel comprises a metering valve, a drying chamber, athermally lagged katharometer (Model 006539 or 006548) and aflowmeter. These items are mounted on a flat panel suitable forfixing to a vertical surface close to the sample point. Thekatharometers are calibrated for the hydrogen puritymeasurement as well as hydrogen in purge gas* and air in purgegas*.

Each katharometer assembly incorporates a Wheatstone Bridgecomprising fine, glass-coated platinum filaments. One pair ofparallel arms is sealed in the reference gas and the other pairexposed to the sample gas.

When the intrinsically safe stabilized current from the 4234power supply unit (Model 4234 500 or 4234 501) is passedthrough this bridge, the temperature of the platinum filamentsrises to a point of thermal equilibrium. Under conditions that arearranged to give minimum radiation and convection heattransfer, the equilibrium temperature depends on the thermalconductivity of the gas surrounding the filament. Thus anydifference between the thermal conductivity of reference andsample gases causes an imbalance in the bridge; this imbalance(as a millivolt signal) is indicated by the display.

Zener diodes are connected across the input connections fromthe power supply unit to the katharometer in order to limit themaximum voltage that could be developed across the filamentbridge under external fault conditions. Under fault conditions thecurrent is limited to a safe value by the power supply unit.

2.3 Model 4234 500/4234 501Power Supply Units (PSU) – Fig. 3.3

Caution. Do not connect the mains supply to the PSUwith the output terminals open circuit.

Caution. Ensure that the PSU is correct for the mainssupply voltage available. A nominal 115V unit cannot beadapted for use with a nominal 230V supply, or viceversa.

To operate a katharometer unit in the hazardous area, one Model4234 PSU is required for each katharometer. The PSU suppliesa stabilized DC current output and must be mounted in the safearea. There are two versions available:

Model 4234 500 for a nominal 230V AC supply voltageModel 4234 501 for a nominal 115V AC supply voltage

The stabilized current output is current and voltage limited torestrict the energy supply into the hazardous area.

The PSU is housed in a metal case fitted with lugs for wall/panelmounting. Cable gland entries are provided at opposite ends ofthe case for supply voltage input and stabilized current outputcables to the hazardous area.

The circuit is protected by cartridge fuses. These fuses musthave a high breaking capacity (HBC) rating of 1500A to complywith the terms of the certification.

2.4 Remote Indicator/ControllersThe 6553 Display Unit has retransmission outputs forconnection to indicator/controllers, providing that they areinstalled in the safe area and the installation conforms to therequirements given in Section 5.1.

…2 DESCRIPTION

Fig. 2.2 Location of Items – Model 6540 203 and 6548 000 Katharometer Analyzer Panels


5

98.8H2–CO2

UIIN O N S E

Hydrogen Purity

& Purge Gas Monitor

Zero

Zero

Range

1 23

F2

Ex

ABB LimitedStonehouse England GL10 3TA

TYPE 4689/500, /501 (or /503)SERIAL No. ......................

ABB LimitedOldends Lane, Stonehouse,Glos. England GL10 3TA

GAS MONITOR TYPE 6553

ll (1)G

[EEx ia] llC Tamb=–20°C to + 40°C

BAS 01 ATEX 7043

ABB L i m i t e dOldends Lane, Stonehouse,Glos. England GL10 3TA

CodeSerial NoVoltageWatts Hz 50–60Year Manuf.Manufactured by:

Retaining Screw

0600

N4006

4689 Display Unit

Ex IntrinsicSafety Label

Ex Ex


Katharometer Type 006548

ll (1)GEEx ia llC T4

Tamb=–20°C to + 55°CBAS 01 ATEX 1042

N4006


Type No.Serial No.Year of Manf.OutputZero GasRange

006548000

0600

Panel Reference No.

Model No.

UniqueReference No.

Gas Type

IntrinsicSafety Label

3.1 IdentificationIt is essential that installers and users clearly identify the variousunits of the monitoring system as follows:

3.1.1 Model 6553 Display Unit – Fig. 3.1Several versions of the 6553 Display Unit are available and aredefined by the code number explained in Section 3.1.4.

Identification and certification labels are fixed to the outside ofthe unit case as shown in Fig. 3.1. Use the ordering code tablein Section 3.1.4 to interpret the identification label code andobtain a precise description of the 6553 Display Unit.

Note. Location of the identification label on the 4689display unit is also shown in Fig. 3.1.

3 PREPARATION

Fig. 3.1 Typical Identification Labels and Locations –Model 6553 Display Unit

Fig. 3.2 Typical Identification Labels and Locations –Model 0065408000 Katharometer Analyzer Panels

3.1.2 Model 006540 203 or 006548 000Katharometer Analyzer Panels – Fig. 3.2The panel is identified by the reference number label as shown inFig. 3.2. The identification and certification labels of theindividual katharometer units (fixed to the katharometer case)are also shown in Fig. 3.2.

6

Ex


CodeSerial NoVoltageWattsYear Manuf.Manufactured by: N4006


TYPE 4234500/501 POWER SUPPLY UNITS

ll (1)G

[EEx ia] llC (–20°C≤Ta≤55°C)

BAS 01 ATEX 7041

Ex

IntrinsicSafety Label

0600

3.1.3 Model 4234 Power Supply Unit – Fig. 3.3The identification and certification labels are fixed to the outsideof the unit case, as shown.

…3 PREPARATION

Fig. 3.3 Typical Identification Labels and Locations –Model 4234 Power Supply Unit

7

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rotinoMyalpsiDHetarapeS 2 syalpsiDsaGegruP&ytiruP

H(syalpsiDegnar-3lauD 2 )saGegruPx2dnaytiruPH(egnar-3elgniS 2 )saGegruPx2dnaytiruP

yalpsiDytiruPnegordyHelgniS

1234

egnaRytiruPnegordyH%001ot%58/08

)evitceridXETAotmrofnoctonseod(%58ot%001)evitceridXETAotmrofnoctonseod(%08ot%001

123

saGegruP)ylno401KA(enoN

OC 2nogrA

negortiN

0123

*lenaPsisylanAsaGenoN

.xam)isp5(grab53.0erehpsomtaottnevrof(erusserpwoL.xam)isp5(grab53.0erehpsomtaottnevrof(spartemalf&erusserpwoL

.xam)isp541(grab01pooldesolcroferusserphgiH

0123

elcibuCelcibuctuohtiW

elcibuchtiW†rotalosisulpelcibuchtiW

†srotacidniylppusrewopdnasBCMsulprotalosisulpelcibuchtiW

0123

)noitpoelcibuChtiwelbaliavaylno(mralAwolFelpmaSsaGdettiftoN

)snoisrevlenapsisylanasagelgnis(401KAdna301KAdettifmralawolfenO)snoisrevlenapsisylanasaglaud(201KAdna101KAdettifmralawolfowT

012

ylppuSrewoPretemorahtaKenoN

zH06/05V511zH06/05V032

012

erutaeFlaicepS

enoNlaicepS

09

**slaunaMnoitcurtsnIdnaslebaLmetsyS

hsilgnEhcnerFnamreG

hsiloP

1237

***†

.201KAdna101KArofderiuqereraslenapsisylanAsaGowT.ytilibaliavarofyrotcaFhtiwkcehC

.ycnadnuder%001eriuqertahtsmetsys201KAotdettifyllamrontoN

3.1.4 AK100 Ordering Information

The equipment conforms with the requirements of ATEX directive for Class IIC gases to Code EEx ia IIC provided that the equipmentis installed in accordance with instructions provided.4.1 Locating and Mounting System Items

3 PREPARATION

8

366

(14.

4)

KatharometerIntrinsically

Safe Circuits

SignalConventional

Circuits

CableEntry

Mounting PanelThickness

6 (0.24) max.

346

(13.

62)

30 (1.18)

Mou

ntin

g P

anel

Dis

play

Fac

e

350

± 0.

5 (1

3.78

±0.2

)(C

utou

t)

Panel Cutout andMounting Requirements

Area ForClamping

Cams

50(1

.97)

70(2

.76)

3 (0.12)278 ± 0.5 (10.94±0.2)(Cutout)

%H2 IN CO2

95.0

290 (11.4) 30 (1.18) 227 (8.94)

%H2 IN AIR

95.0

PowerInput

12

3

Not Fittedto AK104

3 (0.12)

4.1 Locating and Mounting System Items4.1.1 Model 6553 Display Unit – Fig. 4.1

Note. The display unit must be located in the safe area of the application plant in a sheltered interior environment.

The display unit is designed for panel-mounting in a position to suit reading of the displays and with access to the rear for electricalinterconnections. The panel preparation requirements and installation dimensions are shown in Fig. 4.1. The display unit is securedto the panel by four adjustable cam brackets – two each side of the unit chassis.

4 MECHANICAL INSTALLATION

Fig. 4.1 Installation Dimensions – Model 6553 Display Unit

Dimensions in mm

9

148 (5.83)

38(1.5)

10(0.39)19

(0.7

5)

305

(12)

267

(10.

5)

610 (24)

572 ±0.3 (22.5±0.01)

233

(9.1

7)

Outlet

19 (0.75)

Gland for Ø7 to 10.5 (0.28 to 0.41) Cable

4 FixingHoles Ø10 (0.39)

Note. Coupling forØ6 (0.24) Tube (006548000) orØ8 (0.31) Tube (006540203)

SeeNote

SeeNote

140

(5.5

) Cen

ters

110 (4.33) Centers

170 (6.7) 111 (4.37)

120

(4.7

2)

All Holes 7.0 (0.28) Diameter

160

(6.3

)

83

20 (0.79)

30(1

.18)

60 (2

.36)

Cen

ters

Ensure a clearance of at least 100 (4) atboth ends of the unit for acces to the cableglands and to minimize cable bends.

Mains CableEntry

Not Used

Output toKatharometer

3.0 (0.12)

20 (0.79)

30(1

.18)

30(1.18)

4.1.2 Katharometer Analyzer Panel – Fig. 4.2

Note. The panel may be located in the hazardous area (Zone 0, 1 or 2) of the application plant in a sheltered interiorenvironment.

Avoid a location that subjects the katharometer unit to direct sunlight. When two katharometer panels are used locate them inpositions that have the same ambient temperature.

The katharometer unit is fixed to the panel that has fixing holes at each corner for mounting on a suitable vertical surface close to thesample tapping point. The installation dimensions for the panel are shown in Fig. 4.2.

4.1.3 Model 4234 Power Supply Unit – Fig. 4.3

Note. The unit must be located in the safe area of the application plant in a sheltered interior environment.

The power supply unit has four fixing lugs for mounting on a suitable vertical surface. The installation dimensions are shown in Fig. 4.3.

4 MECHANICAL INSTALLATION…

Fig. 4.2 Installation Dimensions –Model 006540 203 or 006548 000 Katharometer Analyzer Panel

Fig. 4.3 Installation Dimensions – Model 4234 Power Supply Unit

Dimensions in mm (in.)


10

Hydrogen Purity& Purge Gas Monitor

ø12 (0.47)

Hazardous AreaCable Glands

Safe AreaCable Glands

Mains PowerCable Glands

478(18.8)

600 (24.6)

140 (5.53)

80 (3.15)

80(3.15)340 (13.4)

382(15.04)

%H2 IN CO2

95.0

%H2 IN AIR95.0

4 Mounting Bracketsø10 (0.39) hole

12 3

515 (20.28) 40(1.57)

630 (24.8)

110(4.33)

Optional Mains Isolator(not fitted to those systems thatrequire 100% redundancy)

4.1.4 Cubicle Mounted System – Figs 4.4 and 4.5The cubicle must be located in a safe area of the application plant and mounted either on the base using four M10 fixings or to avertical surface using the four fixing brackets on the back-plate.

Overall dimensions of the cubicle are given in Fig. 4.4 and the principal base case components are shown in Fig. 4.5.

…4 MECHANICAL INSTALLATION

Fig. 4.4 Installation Dimensions – Cubicle


Cubicle sealed to IP55

Weight of cubicle assembly 56kg (123lb ) max.

11

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1 2 3 4 5 6 7 8 9 10 11 12 13 L N E L N E14 15 16 17 18 19 20 21 22 23 24 25 26

Note. The number of terminals, cable glands, low-flow alarms, PSU's and zener barriers(flow alarms) vary according to ordering information details specified.

Relay No. 2

Relay No. 1

POWERSUPPLY

UNIT No 1

POWERSUPPLY

UNIT No 2

No. 1 No. 2BARRIER FLOW

ALARM

E SCR S1 S2 0V 0V -12V+12V

CH 1

I N COM NC NO

E SCR S1 S2 0V 0V -12V+12V

CH 1

I N COM NC NO

1 2 1 2

3 4 3 4

Barriersfor Low Flow Alarms(if fitted)

Low Flow AlarmRelay 2 (if fitted)

Mains PowerCable Glands

Earth Point (Ground) Low Flow AlarmRelay 1 (if fitted)

Cable Glands for CableTerminations in

Hazardous Areas

Cable Glands forCable Terminations

in Safe Areas

To Cubicle Earth

Power SupplyUnit 2 (if fitted)

Power SupplyUnit 1

Terminal Block

MAINSTERMINAL

BLOCKKATHAROMETER

TERMINAL BLOCKLOW FLOW

ALARMSALARMS AND

RETRANS

Note. A hazardous mixture of hydrogen-in-air could develop in the event of leakage from the sample gas system.Katharometer Analyzer panels must be located in a ventilated area.

The sample pressure must not exceed 0.35bar (Gauge) for Model 6540–203 and 10bar (Gauge) for Model 6548–000.

The incoming sample gas temperature must not exceed 55°C (131°F). Ideally the sample gas temperature should be allowed to reachambient temperature before entry to the katharometer unit.

If there is a risk of significant particle contamination incorporate a suitable 1μm filter unit in the system before the sample gas entersthe Analyzer system.

Compression couplings are supplied at the sample inlet and outlet to the katharometer panel. These couplings are suitable forconnecting 8mm (0.31 in.) (Model 006540 203) or 6mm (0.24 in.) (Model 006548 000) outside diameter metal tube. It isrecommended that stainless steel tube is used.

The complete tubing system should be tested for leaks in accordance with the requirements of the responsible authority.

4 MECHANICAL INSTALLATION…

Fig. 4.5 Location of Main Components on Cubicle Backplate

4.2 Sample Gas Interconnections

12

Saf

e A

rea

See

Not

e 9

Not

e 1

App

arat

us w

hich

is u

nspe

cifie

d ex

cept

that

it m

ust n

ot b

e su

pplie

d fro

m n

or c

onta

in in

nor

mal

or a

bnor

mal

con

ditio

ns a

sou

rce

of p

oten

tial w

ith re

spec

t to

eart

h in

exc

ess

of 2

50 v

olts

r.m

.sor

250

vol

ts d

.c.

Not

e 2a

The

capa

cita

nce

and

eith

er th

e in

duct

ance

or

the

indu

ctan

ce to

resi

stan

ce (L

/R) r

atio

of t

heca

ble

conn

ecte

d be

twee

n th

e +

and

– te

rmin

als

of th

e po

wer

sup

ply

Type

423

4500

/501

and

term

inal

s 1

and

4 o

f a k

atha

rom

eter

Typ

e 00

65XX

mus

t not

exc

eed

the

follo

win

g va

lues

:

Haz

ard

ous

Are

a

See

Not

es 2

& 3

24

15

36

24

15

36

24

15

36

TB5

1817

TB6 1

9 20

PO

WE

R S

UP

PLY

TYP

E 4

234

500/

501

CE

RTI

FIE

D [E

Ex

ia] I

IC(–

20°C

≤Ta

≤+55

°C)

CE

RTI

FIC

ATE

No

BA

S 0

1 AT

EX

7041

- +

21 3 21 3RS

1

RS

2

B1

B2

B3

6553

Dis

pla

y/C

ont

rol U

nit

– +

Indi

cato

r46

89I1

– +

Indi

cato

r46

89I2

4 –

1+ 9 10 3 – 2+

KAT

HA

RO

ME

TER

TYP

E 0

065X

XX

CE

RTI

FIE

D E

Ex

ia II

C T

4

Tam

b=–2

0°C

to +

55°C

CE

RTI

FIC

ATE

No

BA

S 0

1 AT

EX

1042

3 –

2+ 10 4 – 1+6 –

9

KAT

HA

RO

ME

TER

TYP

E 0

065X

XX

CE

RTI

FIE

D E

Ex

ia II

C T

4

Tam

b=–2

0°C

to +

55°C

CE

RTI

FIC

ATE

No

BA

S 0

1 AT

EX

1042

Junc

tion

boxe

s (if

requ

ired)

see

not

e 6.

Loca

tion:

Haz

ardo

us A

rea

or S

afe

Are

a

See

Not

e 1

See

Not

e 1

Junc

tion

boxe

s (if

requ

ired)

see

not

e 6.

Loca

tion:

Haz

ardo

us o

r S

afe

Are

a

RV

1

RV

2

Dis

pla

y/C

ont

rol U

nit

Mo

del

655

3C

ER

TIF

IED

[EE

x ia

] IIC

Tam

b=

–20°

C t

o +

40°C

CE

RT

No

BA

S 0

1 AT

EX

704

3

Gro

upC

apac

itanc

ein

μF

Indu

ctan

cein

mH

L/R

rat

ioin

μH

/Ohm

IIC IIB IIA

7.5 99 999

0.02

0.06

0.16

20 60 160

or

Gro

upC

apac

itanc

ein

μF

Indu

ctan

cein

mH

L/R

rat

ioin

μH

/Ohm

IIC IIB IIA

38 999

999

0.40

1.20

3.20

75 225

600

or

Gro

upC

apac

itanc

ein

μF

Indu

ctan

cein

mH

L/R

rat

ioin

μH

/Ohm

IIC IIB IIA

38 999

999

0.20

0.60

1.60

40 120

320

or

Not

e 2b

The

capa

cita

nce

and

eith

er th

e in

duct

ance

or

the

indu

ctan

ce to

resi

stan

ce (L

/R) r

atio

of t

he c

able

sco

nnec

ted

betw

een

(a) t

erm

inal

s 17

& 1

8 of

the

disp

lay/

cont

rol u

nit T

ype

6653

and

term

inal

s 9

& 1

0of

a k

atha

rom

eter

Typ

e 00

65XX

, (b)

term

inal

s 19

& 2

0 o

f the

dis

play

/con

trol

uni

t and

term

inal

s 9

& 1

0of

a k

atha

rom

eter

Typ

e 00

65XX

, (c)

term

inal

4 &

5 o

f bar

rier

B1

of d

ispl

ay/c

ontr

ol u

nit T

ype

6653

and

term

inal

s 2

& 3

of a

kat

haro

met

er T

ype

0065

XX, m

ust n

ot e

xcee

d th

e fo

llow

ing

valu

es:

Not

e 2c

The

capa

cita

nce

and

eith

er th

e in

duct

ance

or

the

indu

ctan

ce to

resi

stan

ce (L

/R) r

atio

of t

he c

able

sco

nnec

ted

betw

een

4 &

5 o

f bar

rier

B2

plus

term

inal

4 o

f bar

rier

B3

of d

ispl

ay/c

ontr

ol u

nit T

ype

6653

and

term

inal

s 2,

3 &

6 o

f a k

atha

rom

eter

Typ

e 00

65XX

, mus

t not

exc

eed

the

follo

win

g va

lues

:

See

Not

es 2

& 3

Circ

uit A

Circ

uit B

(see

Not

e 8)

Not

e 3

The

cabl

e m

ay b

e se

para

te c

able

s or

may

be

inst

alle

d as

sep

arat

e ci

rcui

ts w

ithin

a ty

pe ‘A

’ or a

type

‘B’

mul

ticor

e ca

ble

as d

efin

ed in

EN

5003

9(19

80) s

ubje

ct to

the

follo

win

g:a.

Eac

h ci

rcui

t sha

ll be

indi

vidu

ally

scr

eene

d w

ithin

a ty

pe ‘A

’ mul

ticor

e ca

ble.

b.Th

e pe

ak v

olta

ge o

f any

oth

er c

ircui

t with

in a

type

‘B’ m

ultic

ore

cabl

e m

ust n

ot e

xcee

d 60

vol

ts.

Not

e 4

The

inst

alla

tion

mus

t com

ply

with

nat

iona

l req

uire

men

ts (e

.g. i

n th

e U

K E

N60

079-

14:1

997)

.N

ote

5Th

e sy

stem

mus

t be

mar

ked

with

a d

urab

le la

bel.

The

labe

l sho

uld

appe

ar o

n or

adj

acen

t to

the

prin

cipa

lite

m o

f ele

ctric

al a

ppar

atus

in th

e sy

stem

or

at th

e in

terfa

ce b

etw

een

the

intr

insi

cally

saf

e an

d no

n-in

trin

sica

lly s

afe

circ

uits

.Th

is m

arki

ng s

hall

incl

ude

the

wor

d S

YS

T or

SY

STE

M, e

.g.

‘BA

S S

YS

TEM

No

Ex

01E

2044

’ or

‘BA

S N

o E

x 01

E20

44 S

YS

T’N

ote

6A

junc

tion

box,

if u

sed,

mus

t sat

isfy

the

requ

irem

ents

of C

laus

es 6

.1 a

nd 6

.3.1

of E

N50

020:

1994

.N

ote

7C

ircui

t A o

r C

ircui

t B m

ay b

e om

itted

.N

ote

8C

ircui

t B m

ay b

e id

entic

al to

Circ

uit A

.N

ote

9Th

is it

em m

ay o

r m

ay n

ot b

e fit

ted.

PO

WE

R S

UP

PLY

TYP

E 4

234

500/

501

CE

RTI

FIE

D [E

Ex

ia] I

IC(–

20°C

≤Ta

≤+55

°C)

CE

RTI

FIC

ATE

No

BA

S 0

1 AT

EX

7041

- +

See

Not

e 10

Not

e 10

Zenn

er b

arrie

rs (B

1, B

2 &

B3)

eith

er M

TL 7

055a

c B

AS

99

ATEX

728

5 or

MTL

775

5ac

BA

S 0

1 AT

EX 7

217

(M

TL 7

055a

c ba

rrie

rs s

how

n on

dia

gram

).

5.1 Electrical Interconnections – Fig. 5.1

5 ELECTRICAL INSTALLATION

Fig. 5.1 System Diagram

13

Zero Adjustmentfor Remote Katharometers(only 1 fitted to AK104)

ClampCam

Mains PowerSupply Fuse

3-way MainsSupply TerminalBlock

Type : 4689Upper DisplayUnit %H2 in Air

Type 4689Lower Display Unit(not fitted on AK104)%H2 and Air in Purge Gas

Zener Diode SafetyBarrier Devices(B2, B3 not fitted to AK104)

Terminal Block (TB5 & TB6)for Katharometer Zero Pots.Intrinsically Safe Circuits(TB6 not fitted to AK104)

Safety EarthTerminal (TS1)

Terminal Blocks forPower and SignalConventional Circuits(TB3 not fitted to AK104)

Range Switch(AK101 only)

L N E 161

TB1

TB3

TB4

TB5 TB6

B1 B2 B3

Warning.

• Equipment in this system operates on AC mainssupply voltage electricity. Suitable safetyprecautions must be taken to avoid the possibility ofelectric shock.

Caution.

• Although certain instruments are fitted with internalfuse protection, a suitably rated external protectiondevice, either a 3A fuse or miniature circuit breaker(MCB) must also be fitted by the installer.

• The proper electrical connections and wiringstandards must be achieved to establish the intrinsicsafety of the system, as certified.

• AC input, intrinsically safe DC output and non-intrinsically safe wiring must all be routed separately.

Fig. 5.1 shows the interconnecting wiring requirements for theAK100 Gas Analyzer system, that must be strictly observed.Details of cable requirements, that must be strictly adhered to,are also given – see Section 5.2.1.

After completing the wiring, check that the continuity earthing(grounding) and isolation of all circuits is to the required localelectrical standards for intrinsically safe circuits.

The separate units of the Analyzer system must beinterconnected as shown in Sections 5.1.1, 5.1.2 and 5.1.3.

5.1.1 Model 6553 Display Unit – Fig. 5.2

Caution. No connections must be made to thehazardous area terminals (Terminal Blocks TB5 & TB6)other than as specified in wiring diagram Fig. 5.3. Theappropriate cable requirements must be strictlyadhered to.

Remove the outer case from the back of the unit to gain accessto the terminal blocks.

Make electrical connections through the bottom of the unit intothe terminal blocks immediately above them – see Fig. 5.2.

The alarm and signal outputs on terminal blocks TB3 & TB4 maybe connected as required. The availability of signal outputs varywith the particular 6553 system – refer to Fig. 5.3 for details.

Make the wiring connections in accordance with the informationgiven in the wiring diagram Fig. 5.3 and Section 5.1.

Refer Fig. 5.4 for connections to cubicle-mounted display unit.

Continued on page 17.

5 ELECTRICAL INSTALLATION…

Fig. 5.2 Location of Components Inside Case (Rear View) – Models AK101 and AK104 Display Units

14

Ext

erna

lpo

wer

sup

ply

TB1 1 2 3 4 5 6 7 8 9 10

Kat

haro

met

erU

nit G

as P

anel

2%

H2

and

Air

in P

urge

Gas

TB1

1 2 3 4 5 6 7 8 9 10

Kat

haro

met

erU

nit

Gas

Pan

el 1

(H2

in A

ir)

TB1

TB2

Pow

er S

uppl

y U

nit 2

4234

LN

E

TB1

TB2

Pow

er S

uppl

y U

nit 1

4234

LN

E

Ext

erna

lpo

wer

sup

ply

No

te. I

nter

conn

ectio

nsm

arke

d w

ith

M

US

T co

nfor

m to

the

intr

insi

cally

saf

e w

iring

requ

irem

ents

give

n in

the

text

.

All

othe

r w

iring

to s

uit p

ower

and

sig

nal

requ

irem

ents

+–

+

–

Zene

r di

ode

safe

tyba

rrie

r de

vice

sC

onne

ctio

ns fo

r Lo

wer

Dis

play

Con

nect

ions

for

Upp

er D

ispl

ay

L N

E

12

34

56

78

910

1112

1314

1516

TB4

NO

NC

CO

M

Rem

ote

Ran

ge(if

fitt

ed)

H2

in P

urge

Gas

*or

Air

in P

urge

Gas

*A

larm

1

Pur

ge G

as V

alue

Ret

rans

mis

sion

+

–

12

34

56

78

910

1112

1314

1516

Ext

erna

l bon

ding

and

eart

h

TS1

TB3

Mo

nito

r

1718

1920

B1

4

3B

24

3

TB5

TB6

TB1 N

ote

.K

atha

rom

eter

Gas

Uni

t Pan

el 1

is c

onne

cted

inte

rnal

ly w

ithin

655

3 G

as M

onito

r to

Upp

er D

ispl

ay.

Kat

haro

met

er G

as U

nit P

anel

2 is

con

nect

ed in

tern

ally

with

in 6

553

Gas

Mon

itor

to L

ower

Dis

play

.

B1

5

4B

25

4

MTL

775

5ac

MTL

705

5ac

NO

NC

CO

M

Ala

rm 1

H2

in A

ir

NO

NC

CO

M

Ala

rm 2

H2

in A

irH

2 in

Air

Valu

eR

etra

nsm

itB

34

3

B3

5

4

+ + – – –

+ –

Common

Range 3

Range 2

Range 1 + –

…5 ELECTRICAL INSTALLATION

Fig

. 5.3

Inte

rco

nnec

tio

n W

irin

g D

iag

ram

– A

K10

1 In

trin

sica

lly S

afe

Ana

lyze

r S

yste

m (H

ydr o

gen

Pur

ity

and

Pur

ge

Gas

)

*No

te. P

urge

gas

opt

ions

incl

ude:

CO

2(C

arbo

n di

oxid

e)N

2(N

itrog

en)

Ar

(Arg

on)

15


TB1

1 2 3 4 5 6 7 8 9 10

Kat

haro

met

erU

nit

Gas

Pan

el 1

(H2

in A

ir)

TB1

TB2

Pow

er S

uppl

y U

nit 1

4234

LN

E

Ext

erna

lpo

wer

sup

ply

No

te. I

nter

conn

ectio

nsm

arke

d w

ith

M

US

T co

nfor

m to

the

intr

insi

cally

saf

e w

iring

requ

irem

ents

give

n in

the

text

.

All

othe

r w

iring

to s

uit p

ower

and

sig

nal

requ

irem

ents

+

–

Zene

r di

ode

safe

tyba

rrie

r de

vice

s

L N

E

12

34

56

78

910

1112

1314

1516

TB4

Ext

erna

l bon

ding

and

eart

h

TS1

Mo

nito

r

1718

B1

4

3

TB5

TB1 N

ote

.K

atha

rom

eter

Gas

Uni

t Pan

el 1

is c

onne

cted

inte

rnal

ly w

ithin

655

3 G

as M

onito

r to

Upp

er D

ispl

ay

B1

5

4

MTL

775

5ac

MTL

705

5ac

NO

NC

CO

M

Ala

rm 1

H2

in A

ir

NO

NC

CO

M

Ala

rm 2

H2

in A

irH

2 in

Air

Valu

eR

etra

nsm

it

+

–

+ –

+ –

Fig

. 5.3

a In

terc

onn

ecti

on

Wir

ing

Dia

gra

m –

AK

104

Intr

insi

cally

Saf

e A

naly

zer

Sys

tem

(Hyd

r og

en P

urit

y)

16

12

34

56

78

9

Kat

haro

met

ers

1011

1213

12

34

56

78

910

1112

1323

2425

2614

1516

1718

1920

2122

L L

L

Mai

ns T

/B65

53 O

utpu

tsU

pper

Dis

play

%H

2 in

Air

6553

Out

puts

Low

er D

ispl

ay(A

K10

1 on

ly)

%H

2 an

d A

ir in

Pur

ge G

as

N/O

Common

N/C

N/O

Common

N/CN/O

CommonN/C

CommonRange 3Range 2Range 1

Cub

icle

Ter

min

al B

lock

s +–

+

–

Air in Purge Gas*or

H2 in Purge Gas*Aarm 1

H2 in AirAlarm 1

H2 in AirAlarm 2

Retransmission

Retransmission

Range SelectorSwitch Position

Indicator

23

910

14

Kat

haro

met

erP

anel

1

23

910

14

Kat

haro

met

erP

anel

2

Haz

ard

ous

Are

aN

ote

. I.S

. Circ

uits

It is

impe

rativ

e th

at w

iring

inst

ruct

ions

are

follo

wed

impl

icitl

y.E

arth

con

tinui

ty m

ust b

e ch

ecke

d fo

r co

rrec

t bon

ding

.

No

te.

Kat

haro

met

er P

anel

1 is

con

nect

ed in

tern

ally

to th

e U

pper

Dis

play

of t

he 6

553

Dis

play

/Con

trol

Uni

t.K

atha

rom

eter

Pan

el 2

is c

onne

cted

inte

rnal

ly to

the

Low

er D

ispl

ay o

f the

655

3 D

ispl

ay/C

ontr

ol U

nit (

AK

101

only

).

1415

1617

1819

2021

2223

24

Low

Flo

wA

larm

sE

x ia

llC

T4

Low

Flo

wA

larm

Rel

ays

23

14

23

14

N N

N

CommonN/CN/O

CommonN/CN/O

Relay 1

Relay 2

Term

inal

Box

ScreenBlack

RedWhite

ScreenBlack

RedWhite

Kat

haro

met

erH

2 &

Air

in P

urge

Gas

Kat

haro

met

erH

2 in

Air

++

––

++

––

If fit

ted

E E

E

13

E

24

LN

E

Mai

ns Is

olat

orS

witc

h(if

fitt

ed)

Mai

ns InInt

erna

lW

iring

6 –


Fig

. 5.4

Wir

ing

Dia

gra

m f

or

Cub

icle

-Mo

unte

d D

isp

lay

Mo

nito

r

*No

te. P

urge

gas

opt

ions

incl

ude:

CO

2(C

arbo

n di

oxid

e)N

2(N

itrog

en)

Ar

(Arg

on)

17

Zero AdjustmentPotentiometer

MeasuringUnit

TubingConnections

Terminal Block (TB1)

DummyRemote Zero

Resistor

Remove whenConnecting

Remote Zero

Mounting Pillars

10

912

11

10

9

8

7

6

5

4

3

2

1

Inlet Outlet

–

–

–

+

+

Caution. The integrity of the fail-safe operation of the zener diode safety barrier devices depends on a Safety Earthconnection which must not have a resistance greater than 1Ω to the application plant earth (ground).

Make the Earth (Ground) and Safety Earth connection at the stud (TS1) – see Fig. 5.2.

On completion of wiring and checks, replace the outer case and secure the clamping brackets to the mounting panel.

5.1.2 Model 006540 203 and 006548 000 Katharometer Analyzer PanelTo gain access to the connection terminal block TB1:

1) Remove four screws in the cover of the katharometer unit.

2) Remove cover

Make the electrical connections to the Display Unit in accordance with the information given in wiring diagrams in Figs 5.3, 5.4 and5.5 and Section 5.2.

The electrical connections are made at the terminal block (TB1) via the cable gland or any replacement gland to suit the intrinsicallysafe wiring requirements. When the appropriate interconnections have been made, if remote zero is to be used, remove the 510Ωdummy remote zero resistor from across terminals 9 and 10 and set the zero adjustment potentiometer on the katharometer to theapproximate mid-point.

Replace the cover when wiring is complete.


Fig. 5.5 Location of Components Inside Case – Model 006539 and 006548 Type Katharometer Unit

18

TB1

T1

L N EF2 F3

Note. Hazardous Voltages.There are no servicable parts in this unit.Please return to the manufacturer if faulty, orseek the services of a qualified engineer.

Ensure that the mains supply is switched offand disconnected before removing the coverfor any reason.

6

8

10

230 V

115 V

Output Current (mA) Links350 C to X250 D to X180 E to X

NO connections should be made topoints A or B

TB2

–

+F1

BA

C X

D E

M5 Earth Stud

Cable Gland forAC Mains Input

OutputCurrentLinks

Cable Gland not used

Cable Gland forDC Output toKatharometer

Mains InputTerminal Block

DC OutputTerminal BlockFuses*

*Refer to the 4234 manual for fuse details.

5.1.3 Model 4234 Power Supply Unit – Fig. 5.6

Caution. Do NOT connect mains supply to the power supply unit with the output terminals on open circuit.

Note. Ensure that the power supply unit is correct for the mains supply voltage available. A nominal 115V unit cannot beadapted for use with a nominal 230V supply or vice versa.

Remove the cover of the unit to gain access to the terminal blocks inside.

Identify the terminal block (TB1) adjacent to the transformer T1 and ensure the correct transformer tapping is used for the incomingmains supply, i.e.

link from tapping 6 to 10 for 230V, orlink from tapping 8 to 10 for 115V.

Make electrical connections in accordance with the information given in the wiring diagrams Figs 5.1 and 5.3 and the cable detailsin Section 5.2.1.

The electrical connections are made at terminal blocks TB1 and TB2 through the appropriate cable gland or any replacement glandto suit intrinsically safe wiring requirements. Secure the incoming cable by the cable clips adjacent to the terminal blocks.

Replace the cover when wiring is complete.


Fig. 5.6 Location of Components Inside Case – Model 4234 Power Supply Unit

19

5.2 Intrinsically Safe RequirementsThese requirements relate to the interconnecting wiring made toand from Model 6540 203 and 6548 000 Katharometer AnalyzerPanels in the hazardous area and those for remote ancillaryitems connected to the system.

5.2.1 Cable RequirementsThe interconnecting cables between the various units of the gasanalysis system are subject to stringent limitations because ofthe requirements of the intrinsic safety certification. These arelisted below and detailed in Fig. 5.1.

All cables entering the hazardous area must be kept separatefrom cables in the safe area. Cables entering the hazardous areamust not be run with other cables and terminations must havean earthed screen to separate them from connections for othercircuits. The detailed requirements are as follows:

1) Connections between Model 006540 203 or 006548000 Katharometer Analyzer Panels and the 4234 PSU

All cables from the katharometer in the hazardous areamust have an inductance/resistance ratio not exceeding20μH/Ω (for Group IIC gases). Also the maximum loopresistance of this interconnecting cable is limited to 1.5Ω;This may place a limitation on the length of the total cablerun.

Twist single-sheathed conducting cables together toreduce their mutual inductance, route them separatelyfrom cabling for non-intrinsically safe circuits in the safearea.

2) Connections between Model 006540 203 or 006548000 Katharometer Analyzer Panels and Model 6553Display Unit

Katharometer to display unit cables carrying the outputsignals through zener barrier units inside the display unitare subject to a maximum inductance/resistance ratio of20μH/Ω (for group IIC gases). These wires are indicatedby a in Figs. 5.3 and 5.3a.

5.2.2 Recommended CablesThe choice of wiring cable is restricted by the limitationsimposed by the certification parameters. Care must be taken toensure that the specification of the cable required forinterconnection lengths is such that the certification parameterlimits are not exceeded – see Notes 2a, b and c in Fig. 5.1.

Cables manufactured to DEF STAN 61-12 Part 5 should comply,but care must be taken over the number or cores included in thecable; there is a significant difference between the 2-core and6-core cables. The diameter over the screen in the 6-core cableis greater than that of the 2-core and this diameter affects boththe inductance and capacitance values.

The values of a typical DEF STAN 61-12 Part 5 cable are:

2-core 6-coreInductance (μH/metre) 0.325 0.467Capacitance (pF/metre) 190 143L/R (μH/Ω) 8.6 11.4Test voltage 2kV AC for one minuteRated voltage 440V RMS

Typical cables may be obtained at the following addresses:

www.permanoid.co.ukwww.Belden.com

Note. Interconnection lengths and number of cores willdictate which cable is required e.g. Belden 9512 cable.

5.2.3 Installing Remote Ancillary ItemsAny indicator/controllers, or other electrical equipment,connected to TB1 of the Model 6553 Display Unit must not besupplied from, nor contain, a voltage source greater than 250VDC or 250V RMS with respect to earth.

5.2.4 Full Intrinsically Safe RequirementsFor systems to be modified or used with other gases the fullATEX requirements must be complied with as follows:

1) The total Capacitance and Inductance or Inductance toResistance ratio (L/R) of the cables connecting thekatharometer unit to the hazardous area terminals of thedisplay unit (TB2) and power supply unit terminals (TB1)must not exceed the values given in Fig. 5.1.

2) Any junction boxes used in the hazardous or safe areasmust conform to ATEX Directive 9/94/EC, specificallyclauses 6.1 and 6.3.1 of EN50020:1994.

When the AK100 gas analyzer system has been correctlyinstalled in accordance with the requirements for intrinsicsafety in Section 5.2, refer to Section 6 for system set up.

5 ELECTRICAL INSTALLATION

20

ElectricalInterconnections

Flow Gauge

Gas SampleOutlet

Local ZeroAdjustment

Drying Chamber

KatharometerUnit Case

MeteringValve

GasSample

Inlet

6.1 Katharometer Analyzer Panel –Filling the Drying Chamber – Fig. 6.11) Remove the drying chamber on the katharometer analyzer

panel by unscrewing the large knurled nut at the base of thechamber. Pull the chamber down and out of the sealinggroove to remove it from the panel.

Note. The desiccant used in the drying chamber iseither granular anhydrous calcium sulphate or calciumchloride and absorbs moisture from the atmosphere.The drying chamber has a capacity of 140ml approx.and requires approx. 100g of desiccant to fill it. Fillingand resealing must be carried as quickly as possible.

2) Open a container of fresh desiccant and fill the dryingchamber.

3) Replace the drying chamber in its sealing groove andreposition the chamber to enable it to be secured and sealedby hand tightening the knurled nut.

4) Carry out an approved leak testing procedure before passingsample gas through the system.

6.2 Setting Sample FlowWhen all tubing interconnections have been made and externalparts of the sample system checked for leaks, carry out thefollowing procedure:

1) Supply calibration quality purge gas* through the gasanalyzer system at the normal working pressure of theapplication plant and within the following limits:

Model 6540-203125mm H2O min. to 0.35bar (gauge) max.

Model 6548-000125mm H2O min. to 10bar (gauge) max.

Note. In some instances testing for leaks with purgegas* may not be considered an adequate check of gastight integrity in respect of the more penetratinghydrogen gas. Consideration should be given to theuse of a gas, such as helium, which has penetratingproperties nearer to that of hydrogen.

2) Slowly open the metering valve to give a nominal flowrate ofgas of 100 to 150ml min–1. Do not exceed the maximumflowrate 250ml/min.

3) Set the flowrate and shut off the calibration gas external tothe analyzer system.

4) Repeat this procedure for each katharometer analyzer panel,as required.

6 SETTING UP

Fig. 6.1 Location of Katharometer Analyzer Panel Components


21

6.3 Electrical ChecksCarry out the electrical checks detailed in Sections 6.3.1 and6.3.2.

6.3.1 Power Supply Unit Output

Warning. This unit is part of the certified intrinsicallysafe system. Appropriate safety precautions must betaken to prevent any incendive electrical discharges inthe hazardous area when carrying out this task.

Testing the output may only be carried out with thehazardous area cable disconnected.

1) Electrically isolate the PSU.

2) Remove the cover from the PSU.

3) Disconnect the output wires to the hazardous area atterminals TB2+ and TB2–.

Warning. Ensure that proper electrical safetyprecautions are taken at all times when undertaking thisprocedure.

4) Switch on the PSU and check that the output measures350mA into a 14Ω load.

5) On completion of tests isolate the unit and reconnect theoutput wires to the hazardous area.

6) Replace the cover on the unit.

6.3.2 Zener Diode Safety Barrier DevicesThe zener diode safety barrier devices (MTL7755ac orMTL7055ac) in the 6553 Display Unit are checked at the time ofmanufacture. To ensure absolute safety when fitting a newinstrument, check that the barriers in the display unit areproperly earthed by carrying out a routine test before using theanalyzer system.

Warning .

• This unit is part of the certified intrinsically safesystem. Appropriate safety precautions must betaken to prevent any incendive electrical dischargesin the hazardous area when carrying out this task.

• If these tests reveal a faulty zener barrier, the barrierMUST be replaced by a new unit. The barrier is asealed unit and no repair is permitted. The correctzener barriers are certified intrinsically safe andconform to the ATEX Directive 9/94/EC, certificatenumber BAS 01 ATEX 7217 (MTL 7755ac) orBAS 99 ATEX 7285 (MTL 7055ac).

• Replacement Zenner barriers MUST be of the sametype.

6.3.3 Checking System EarthCheck that the resistance between earth terminals on theanalyzer system and the application plant system safety earthdoes not exceed 1Ω.

6 SETTING UP

22

%H2 IN AIR

AlarmLEDs

UpperDisplay Line

LowerDisplay Line

Membrane Switches

A – Advancing to Next Page

Parameter 1Parameter 2Parameter 3Parameter 4

Page 1Parameter 1Parameter 2Parameter 3

Page 2

Advance tonext page

For majorityof parameters

or

B – Moving Between Parameters

C – Adjusting and Storing a Parameter Value

New value isautomatically stored

Parameter Value Adjust

D – Selecting and Storing a Parameter Choice

Parameter XYZ

Select

Parameter 1

Parameter 2Parameter 3

Page X

Parameter 4

Advance tonext parameter

or

New value isautomatically storedor

7.1 Displays – Fig. 7.1The displays mounted in the 6553 panel comprises a 5-digit, 7-segment digital upper display line and a 16-character dot-matrixlower display line. The upper display line shows actual values ofhydrogen purity, hydrogen in purge gas*, air in purge gas*, alarmset points or programmable parameters. The lower display lineshows the associated units or programming information.

7 CONTROLS & DISPLAYS

Fig. 7.1 Location of Contnrols and Displays

Fig. 7.2 Function of the Membrane Switches

7.2 Switch Familiarization – Figs. 7.1 and 7.2


23

Warning. When the apparatus is connected to itssupply, terminals may be live and the opening of coversor removal of parts (except those to which access maybe gained by hand) is likely to expose live parts.

8.1 Instrument Start-UpIn normal operation, the range selector switch is set toposition 1 and the instrument displays the Range 1 OperatingPage – see Section 9.2. This is a general use page in which thealarm set points may viewed but not altered. To change an alarmset point or program a parameter refer to Section 10. A 5-digitSecurity Code is used to prevent unauthorized access toprogrammable parameters. The value is preset at 00000 to allowaccess during commissioning but should be altered to a uniquevalue, known only to authorized operators, as described in theSetup Outputs Page – see Section 10.3.3.

When all the required wiring connections and electrical checkshave been made correctly, switch on the power supplies to thevarious units as follows:

1) Switch on the supply to the PSU.

2) Switch on the supply to the 6553 Display Unit.

3) If cubicle-mounted, switch on supply via the isolatorswitch, if fitted.

8.2 Alarm Set Point8.2.1 Type of Alarm ActionThe alarm relay coil is energized during normal non-alarm relaystates and is de-energized upon recognition of an alarmcondition, thereby providing 'fail-safe' alarms. For example, withAlarm 1 set point = 95.0%, when the display is indicating greaterthan 95.0% (plus hysteresis), Alarm Relay 1 is energized andAlarm 1 LED is OFF. When the display indicates less than 95.0%(minus hysteresis), Alarm Relay 1 is de-energized and Alarm 1LED is ON. This operating mode ensures that an alarm conditionis signalled in the event of a mains power failure. Repeat theprocedure for Alarm Relay 2 set point = 90.0%.

8.2.2 Hydrogen Alarm Set PointIt is recommended that the hydrogen alarm set-points are basedon a reducing percentage of hydrogen as it is displaced by airentering the application plant. This can be achieved by settingAlarm 1 and Alarm 2 to give ample warning of the developmentof a potentially explosive mixture. Factory settings are Alarm 1 =95.0% and Alarm 2 = 90.0%.

The procedure is as follows:

Access the programming pages (Section 10) and set the alarmset-points in accordance with the information in the Set UpOutputs Page. The hydrogen alarm set point can only be set withthe selector switch in position 1.

8.3 Electrical CalibrationThe instrument is factory calibrated for electrical voltage signalinput. No adjustment is normally necessary for correctfunctioning of the display unit. If electrical calibration is required,a voltage source capable of supplying 0.00 mV and 10.00 mV isneeded. Disconnect the katharometer input from the display unitand the voltage source signal applied according to theinstructions in the Electrical Calibration Page – see Section 10.

Note. The 4689 instruments incorporate a two-pointcalibration sequence requiring both zero and spaninputs for a calibration. It is not possible to adjust eitherthe range zero or the range span scale pointsindependently.

8.4 Gas Calibration8.4.1 IntroductionBefore putting the system on-line, it is recommended that acalibration check for the 'zero' reading is made using calibrationstandard sample gas.

The 'zero gas' is marked permanently on the data plate of thekatharometer unit. This gas, when passed through thekatharometer, gives a zero millivolt output. To provide a fail-safecondition for hydrogen purity, the zero gas is 85% hydrogen-in-nitrogen mixture. If power is lost to the katharometer, a hydrogenpurity alarm condition occurs on the display unit.

Full scale output from the katharometer is obtained by a 100%hydrogen gas sample and no adjustment of the katharometeroutput is normally required. The maximum signal for the full scalereading is sealed during manufacture and must not be altered byusers.

8.4.2 Purge GasWhen a purge gas katharometer forms part of the 6553 System,the startup procedure is as follows:

Notes.

1. The procedure outlined here is not normallynecessary as the ranges have been set at thefactory.

2. Test for leaks in accordance with the requirements ofthe responsible authority after making any gasconnections.

1) Pass suitable calibration quality gas through the purge gas*katharometer, on the appropriate katharometer analyzerpanel. The gas should be at the normal working pressure ofthe sample gas. This provides the correct flowrate of purge/sample gas as set previously.

8 START-UP


24

2) Power up the monitor unit, and the purge gas katharometerunit by switching on the appropriate power supply unit.

3) Set the range selector switch on the gas monitor unit toposition (3).

4) The upper display unit indicates NOT IN USE.

5) The lower display unit indicates the selected measurementparameter – percentage by volume of air in purge gas*(%AIR IN * ) – on its lower display line. The upper display lineindicates a value for the parameter.

6) With suitable calibration gas passing through the samplesystem at the normal flowrate, the upper line of the lowerdisplay unit should stabilize within 2 hours to read 0.0.

7) If necessary, refer to Section 10.3.3 for a full calibrationsequence.

Note. A remote zero adjustment facility is available atthe lower 'zero' potentiometer adjacent to the displayunit. Adjustment is made by inserting a screwdriverthrough the hole behind the small escutcheon plate.

8) Reset the range selector switch on the gas monitor toposition 2. The upper display continues to indicate NOT INUSE.

9) The lower display unit indicates the selected measurementparameter – percentage by volume of hydrogen in purgegas* (%H2 IN * ) – on the lower line. The upper line indicatesa value for the parameter.

10) With purge gas* continuing to pass through the samplesystem, the upper line of the lower display unit shouldstabilize within a few minutes to read 0.0.


Note. No adjustment of the lower zero potentiometer isnecessary as any adjustment required will already havebeen made while calibrating the 'Air in purge gas*'range.

8.4.3 Hydrogen

Note. Test for leaks in accordance with therequirements of the responsible authority after makingany hydrogen connections.

1) Pass calibration quality hydrogen gas through the (H2)Katharometer Unit on the appropriate katharometer analyzerpanel, at the normal working pressure of the sample gassystem. This provides the correct flowrate of gas, as setpreviously.

2) Power up the monitor unit and the hydrogen katharometerunit by switching on the appropriate power supply unit.

3) If fitted, set the range selector switch on the monitor unit toposition (1).

4) The upper (hydrogen) display indicates the measurementparameter – percentage by volume of hydrogen in air (%H2IN AIR) – on the lower line. The upper display line indicates avalue for the parameter.

5) If fitted, the lower (purge gas) display unit indicates NOT INUSE.

6) With hydrogen calibration gas passing through the samplesystem at the normal flowrate, the upper display line of thetop display unit should stabilize within 2 hours to read 100.0.


Note. Remote zero adjustment is available – see Fig.2.1. Adjustment is made by inserting a screwdriverthrough the hole behind the small cover plate.

…8 START-UP


25

9 OPERATION

9.1.2 Filling with Hydrogen Coolant GasThis procedure is a reversal of the purging procedure.

Initially, inert purge gas* is introduced into the application plantuntil the air content is safely below the explosive limit for air inhydrogen. When this limit is reached, hydrogen is graduallyintroduced into the system to displace the other two gases.

With respect to the operation of the gas analyzer system, theprocedure is as follows:

Warning. Suitable safety precautions apply to theoperation of the gas cooling and sample systems.

Note. For optimum accuracy it is recommended thatthe filling operation commences within 24 hours ofcarrying out the calibration procedure.

1) Select position (3) of the range selector switch on the displayunit. The displays and functions are shown in Table 9.1.

2) When the changeover to introduce hydrogen into theapplication plant is made, select position (2) of the rangeselector switch on the display unit. The displays andfunctions are shown in Table 9.1.

3) When the display indicates that hydrogen filling is complete,position the range selector switch at (1). The hydrogenmeasurement analyzer system is now on-line in monitoringmode – see Section 9.2.

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2mralAtnioPteSyalpsiDlautcA noitcnuF yalpsiDlautcA noitcnuF

reppUyalpsiD

)1( x.xxx eulaVelbairaV H% 2 riAni ytiruPnegordyH deriuqersA deriuqersA

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401KAehtotelbacilppatoN

Table 9.1 Functions and Status of Display Units for Different Range Selector Switch Positions

9.1 NormalDuring normal operation the AK100 Gas Analyzer System isused to indicate the purity of hydrogen used as a coolant. Thedisplays shows the percentage of hydrogen in air, which shouldbe safely in excess of the explosive limit at the hydrogen richend.

There are no routine adjustments required to the gas analyzersystem after completion of start-up procedures and putting on-line in monitoring mode. The system requires only the carryingout of safety routines and minor adjustments to the meteringvalve to maintain the required flowrate.

A summary of the functions and status of the system for thedifferent range selector switch positions is shown in Table 9.1.

Note. Sections 9.1.1 and 9.1.2 only apply to theAK101.

9.1.1 Purging of Hydrogen Coolant GasInitially, inert purge gas* is introduced into the system. When thehydrogen concentration is safely below the explosive limit, air isintroduced into the system to completely displace the other twogases.

The AK100 Gas Analyzer System provides all the necessaryindications and output signals to enable this operation to becarried out safely.

In respect of the operation of the gas analyzer system(s), theprocedures are as follows:

Note. Suitable safety procedures apply to theoperation of gas cooling and sample systems.

1) Select position (2) of the range selector switch on the displayunit. The displays and functions are shown in Table 9.1.

2) Commence the purging operation.

3) When the changeover to introduce air into the applicationplant is made, select position (3) of the range selector switchon the display unit. The displays and functions are shown inTable 9.1.


26

Alarm 1 Setpoint

Alarm 2 Setpoint

Press to advanceto next parameter

Press to advanceto next page

SECURITY CODE

0 0 0 0 0

or

SECURITY CODE

SECURITY CODE

%H2 IN AIR

%H2 IN *

AIR IN *

Up

per

Dis

pla

yLo

wer

Dis

pla

y

SPT.2 H2 IN *

xxx.x

SPT.2 H2 IN *

xxx.x

9.2 Range 1 Operating PageRange 1 is selected for normal operations and the Operating Page indicates the purity of the hydrogen used as a coolant. The alarmset points can be viewed but not altered. To change the alarm set points or program other parameters refer to Section 10.

Hydrogen PurityShows the percentage of hydrogen in air.

These two keys are used to advance to all subsequent parameters and pages.

Alarm 1 Set PointThe set point value is programmmable – see Section 10.3, Set Up Outputs Page.

Alarm 2 Set PointThe set point value is programmmable – see Section 10.3, Set Up Outputs Page.

Advance to Access to Secure Parameters on page 28.

9.3 Range 2 Operating Page – AK101 onlySet to Range 2 the single Alarm Set Point value may be changed, this is displayed in the Operating Page.

9.4 Range 3 Operating Page – AK101 onlySet to Range 3 the single Alarm Set Point value may be changed, this is displayed in the Operating Page.

…9 OPERATION


27

UPPER DISPLAYRange 1

Operating Page

Upper Display

English

SECURITY CODE

SET UP OUTPUTS

Set Up Outputs PageElectrical

Calibration Page

Access toSecure Parameters

xxx.xLanguage Page

No Yes

Alter Sec. Code

Alarm 1 Setpoint

%H2 IN AIR

Adjust RTX Zero

Adjust RTX Span

Calibrate No

ELECTRICAL CAL

Secure Parameters

Note. All parameter values shown on the upperdisplay line are the default settings.

Alarm 2 Setpoint

RTX Type 4-20

0-20

0-10

100.0

75.0

50.0

25.0

0.0

EB

A1 Action EA

Yes

NOT IN USE

Lower Display

EB

A2 Action EA

A1 Setpoint

A2 Setpoint

Range 85% -100

mV Zero (0.00mV)

xxx.xxxx.x

mV Span (10.00mV)

xxx.x

Test Retrans (%)

Range 80% -100

Note.The following programming pages apply to both display units.

10 PROGRAMMING

Fig. 10.1 Overall Programming Chart for 6553 Display Unit (Range 1) – AK101 and AK104

28

**

** Only when 'Alarm H2 in CO2'selected in Set Up Outputs Page

LOWER DISPLAYRange 2

Operating Page

Lower Display

English

SECURITY CODE

SET UP OUTPUTS


Calibration Page


xxx.xLanguage Page

No Yes

Adjust RTX Zero

Adjust RTX Span

Calibrate No

ELECTRICAL CAL

Secure Parameters


RTX Type 4-20

0-20

0-10

AIR IN *

Alarm H2 IN *

Yes

NOT IN USE

Upper Display

EB

Relay Action EA

Alarm Setpoint

Test Retrans (%)

mV Zero (0.00mV)

xxx.xxxx.x

mV Span (10.00mV)

xxx.x

Alter Sec. Code

%H2 IN *

SPT. %H2 IN *

Note. Programming of the Language page, Set Up Outputs page and the Electrical Calibration page should be carried outwithin Range 2. If circumstances require, they can also be accessed from Range 3. It is not necessary to work through theSet Up Outputs page and the Electrical Calibration page in Range 3 once they have been set up in Range 2.

…10 PROGRAMMING

Fig. 10.2 Overall Programming Chart for 6553 Display Unit (Range 2) AK101 only


29

LOWER DISPLAYRange 3

Operating Page

Lower Display

English

SECURITY CODE

SET UP OUTPUTS


Calibration Page


Language Page

No Yes

Adjust RTX Zero

Adjust RTX Span

Calibrate No

ELECTRICAL CAL

Secure Parameters


RTX Type 4-20

0-20

0-10

AIR IN *

Alarm H2 IN *

Alarm Setpoint

Yes

NOT IN USE

Upper Display

EB

**

** Only when 'AIR IN *'selected in Set Up Outputs page

Relay Action EA

Test Retrans (%)

mV Zero (0.00mV)

xxx.xxxx.x

mV Span

Alter Sec. Code

%AIR IN *

SPT. AIR IN *

xxx.xxxx.x

see Note

Note.CO2 – 10.00mV.N2 – 1.00mV.Argon – 10.00mV.

10 PROGRAMMING…

Fig. 10.3 Overall Programming Chart for 6553 Display Unit (Range 3) – AK101 only


30

SECURITY CODE

English

SET UP OUTPUTS

A1 Action EA

EB

noitcAmralAnoitcADEL

tupnIroftnioPteSevobA

noitcADELtupnIrof

tnioPteSwoleB

noitcAyaleRtupnIrof

tnioPteSevobA

noitcAyaleRtupnIrof

tnioPteSwoleB

BE NO FFO dezigrene-eD dezigrenE

AE FFO NO dezigrenE dezigrene-eD

The set point band is defined as the actual value of the set point ± 1% of the set pointvalue. Alarm action occurs if the input value is above or below the set point band. If theinput moves within the set point band the last alarm action is maintained.

Continued on next page…

10.1 Range 1 (UPPER DISPLAY)

10.1.1 Access to Secure ParametersA 5-digit code is used to prevent unauthorized access to the secure parameters.

10.1.2 Language Page

Security CodeEnter the required code number, between 00000 and 19999, to gain access to thesecure parameters. If an incorrect value is entered, access to subsequent programmingpages is prevented and the display reverts to the Operating Page.

Note. The security code is preset at '00000' to allow access during commissioning butshould be altered to a unique value, known only to authorized operators – see AlterSecurity Code parameter in Set Up Outputs Page.

Advance to Language Page.

Language PageSelect the required language for the display.

Advance to Set Up Outputs Page.

10.1.3 Set Up Outputs Page

Alarm 1 ActionFor 'Fail-Safe' alarm operation the relay's alarm state must be the same as the power-down state, i.e. the relay is de-energized.

For high alarm operation the relay must be Energized Below the alarm set point (EB).

For low alarm operation the relay must be Energized Above the alarm set point (EA).

The alarm LEDs are illuminated in the alarm condition.

Select the required alarm action from the following table:

...10 PROGRAMMING

31

A1 Set Point

A2 Set Point

RTX Type 4-20

0-20

0-10

Alter Sec. Code

A2 Action EA

EB

Continued from previous page

Return totop of page

RTX Range 85%

Test Retrans (%)

100.0

75.0

50.0

25.0

0.0

Alarm 1 Set PointThe Alarm 1 Set Point can be set to any value within the input range being displayed. Theset point value is subject to hysteresis within the set point band as detailed above.Set the alarm set point to the required value.

Advance to next parameter

Alarm 2 ActionSee Alarm 1 Action.


Alarm 2 Set PointSee Alarm 1 Set Point.The decimal point position is set automatically. The alarm LEDs are illuminated in thealarm condition.


Retransmission Output TypeThe retransmission output is assigned to the hydrogen purity range.Select the retransmission output range required (4 to 20mA, 0 to 20mA or0 to 10mA).


Test Retransmission OutputThe instrument transmits a test signal of 0, 25, 50, 75 or 100% of the retransmissionrange. The % test signal selected is shown on the upper line of the display.

Example – for the range 0 to 20mA and 50% retransmission test signal, 10mA istransmitted.


Select the retransmission test signal required:Ranges 4689 500/501 100 to 85% and 100 to 80%

4689 500/503 85 to 100% and 80 to 100%


Alter Security CodeSet the security code to a value between 00000 and 19999.This value will then have to be entered to regain access to the secure parameters.

Advance to Electrical Calibration Page.

…10.1.3 Set Up Outputs Page (UPPER DISPLAY)

10 PROGRAMMING...

32

ELECTRICAL CAL

Calibrate No

xxx.xmV Zero (0.00mV)

xxx.xmV Span (10.00mV)

Adjust RTX Zero

Adjust RTX Span

Yes No

Yes

Notes.1) The 4689 instruments incorporate a two-point calibration sequence requiring both

zero and span inputs for a calibration. It is not possible to adjust the range zero or therange span scale points independently.

2) The i

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AK101 and AK104 Gas analyzer systems for Hydrogen-cooled ......This is the hydrogen purity...

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