MM850079-04 MicroCal 1IS

EUROTRON ITALIANA s.r.l.Via Manin 350/1920099 S.S.Giovanni (MI) - ItalyTel. (02) 2408741 Fax (02) 2440286

eurotron

MicroCal 1 I.S.Multifuntion Indicator-Simulator

Instruction Manual Ed. 04

_______________________________________________ ___________________________________________________Instruction Manual n. MM850079 ed. 04

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INTRODUCTORY NOTE

ATTENTION:THIS MANUAL MUST BE REFERRED TO INSTRUMENTS WITH SERIAL NUMBER 02075 ONWARDS.

This publication contains operating instructions, as well as a description of the principles of operation, ofthe MicroCal 1 I.S. portable calibrator.The information covers all models of the instrument, including the basic equipment and its options andaccessories.The manual is a complete ÒUSER GUIDEÓ, providing step-by-step instructions for operating theMicroCal 1 I.S. in each of its designed functions.

The information contained in this publication is derived in part from proprietary and patent data ofEUROTRON Italiana. This information has been prepared for the sole purpose of assisting operatingpersonnel in the efficient use of the instrument.Publication of this information does not convey any rights to use or reproduce it for any purpose otherthan in connection with the installation, operation, and routine maintenance of the equipment describedherein.

The I.S. omologation rule indicates that Instrinsic Safety Enquirement should be repaired only by themanufacturer directly or by a Laboratory authorized by the manufacturer.Therefore any alterations, modifications and/or repairs made by un-authorized body will automaticallyvoid the omologation and will transfer the product's liability to the company that has carried out the work

The instrument is powered by an internal sealed group of rechargeable batteries. An external batterycharger module, with power voltage set at 110 V ac or 220 V ac, is supplied as standard.Always check battery charger data; to modify power supply or to replace main plug, see paragraph 8.2,and correct data written on the battery charger label.

WARNING

ALL OPERATIONS RELATED TO BATTERY CHARGE MUST BE PERFORMED IN A SAFE AREA.


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CONTENT

1 GENERAL 51.1 Intrinsic safety 51.2 Performance 61.3 Instrument code 71.4 Specifications 81.4.1 Table of ranges and accuracies 101.4.2 Extended ranges and related accuracies. 11

2 GENERAL FEATURES 122.1 Input and output flexibility 122.2 Self calibration 122.3 Keyboard 122.4 Display 122.5 Scale factor function 122.6 Square root function 122.7 Average measurements 132.8 Multi step or continuous ramp simulation 132.9 Case 13

3 PHYSICAL DESCRIPTION 14

4 FUNCTIONAL DESCRIPTION 154.1 Power supply 154.2 Operative keyboard 164.3 Input circuit 174.4 Microprocessor 174.5 Firmware 174.6 Digital display 174.7 Digital to analog converter 184.8 Battery charger. Operation from mains supply. 184.9 Resistance and Rtd measurements (only 3901 I.S.-Rtd model) 184.10 Resistance and Rtd simulation (only on model 3901 I.S.-Rtd) 194.11 Thermocouples input/output circuit 20

5 UNPACKING 21

6 PRE-OPERATIONAL CHECK 22

7 ELECTRICAL CONNECTIONS 237.1 Wiring practice 24

8 OPERATION & APPLICATIONS 258.1 Rechargeable batteries. 258.2 Battery charger / Power supplied from power line ac 258.3 - Power "ON" 268.4 Battery voltage indication. 268.5 Operating mode set-up. 278.5.1 IN / OUT function selection278.5.2 Parameter or sensor selection 288.5.3 °C/°F selection 288.5.4 Decimal point position 298.5.5 Average readings 298.5.6 IN / OUT data memories 298.5.7 Ramp program 308.5.8 Rj compensation mode check 318.5.9 Scale factor program 32


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8.5.10 Installation parameter mode 348.5.10.1 Program release code 348.5.10.2 Reference junction compensation set-up 358.6 Faulty operating conditions 35

9 MAINTENANCE 379.1 Safety recommendations 379.2 Spare parts 379.3 Storage 37

10 CERTIFICATES 3810.1 Warranty 3810.2 Certificate of conformity 3810.3 CESI certificate of conformity 38

11 SUPPORT DOCUMENTATION 39

12 APPENDIX 40


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1 GENERAL

1.1 Intrinsic safety

In many industrial processes where flammable materialsare handled, any leak or spillage may give rise to anexplosive atmosphere.To protect both plant and personnel, precautions must betaken to ensure that this atmosphere cannot be ignited.Intrinsic safety (IS) is a technique that achieves safety bylimiting the electrical-spark energy (and surfacetemperature) that can arise in hazardous areas to levelsthat are insufficient to ignite an explosive atmosphere.IS is therefore inherently safe as evidenced by the fact thatit is the only technique that is accepted for Zone O (highrisk) hazardous areas where the explosive gas atmosphereis present continuously or for long periods.It is also safe for personnel since the voltages are low andit allows field equipment to be maintained and calibratedÒliveÓ.The basic principles of IS are very simple.All flammable materials are grouped according to the sparkenergy needed to ignite them.An IS device is designed and certified as being safe for aparticular group of gases as follows:

methane propane ethylene hydrogen acetyleneI IIA IIB IIC IIC

Hazardous-area apparatus are classified according to the maximum surface temperature that it canproduce under fault conditions, and the user must check that this is safe for the gases used in hisprocess.

T1 T2 T3 T4 T5 T6450¡C 300¡C 200¡C 135¡C 100¡C 85¡C

In the hazardous area simple accessories that do not generate or store significant electrical energy canbe used without certification: i.e. they include thermocouples and resistance thermometers.

THE MICROCAL 1 I.S. INDICATOR-SIMULATOR HAS SUCCESSFULLY MET THE VERIFICATION AND TEST REQUIREMENTS

PRESCRIBED BY EN 50.014 AND EN 50.020 STANDARDS WITH A CLASSIFICATION

EEx ia IIC T6

CESI, an approved certifying authority of the EEC, has ensured the design compliance to the abovementioned intrinsic safety standards.


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1.2 Performance

The portable calibrator MicroCal 1 I.S. is a multifunction instrument designed to meet, in a modern andpractical way, the needs of instrumentation engineers, both in laboratory and field work.Accurate, compact, rugged, easy to use; the ideal solution for measuring and simulating:

- millivolts- milliamperes- ohms- thermocouples- resistance thermometers

The MicroCal 1 I.S. has been developed using the most advanced microprocessor technology toprovide high accuracy on extended ranges and a powerful operating flexibility.Linearization algorithms of the characteristic curves of thermocouples and resistance thermometers areheld in the microprocessor memory in accordance with IEC/ANSI and DIN standards (thermocouplestype T, K, J, S, R, E, B, N, C, U, L, F and resistance thermometers Pt 100 and Ni 100).Resistance and resistance thermometer measurement and simulation requires an auxiliary module thatis available only on instrument model 3901 I.S.-Rtd.The above module is based on a proprietary circuit (Eurotron patent n. 206327).An unique automatic Rj compensation system allows the MicroCal 1 I.S. to provide accurate input andoutput readings over wide ( -5¡C to +50¡C ) operating conditions.Furthermore, for external RJ joints the temperature is adjustable from -50¡C to +100¡C.The selection of the operative mode is made on a polycarbonate membrane keyboard with an workinglife up to one million operations per key.Two thick film membrane slidewires (Patent Pending) are used to set the magnitude of the simulatedsignal.Both measured and simulated values are indicated on a high quality LCD dot matrix display whichassures good contrast even in poor light conditions.A menu-driven procedure allows the generation of three memory stored values, or a continuous stepramp output.The instrument carries out mathematical functions for averaging unstable input signals and, incombination with scale factor, square root calculation.The case, made of shock-resistant and self-extinguishing ABS, is ergonomically designed for easypractical use.The instrument is powered by an internal sealed group of rechargeable batteries, equipped with fuseand protection resistor; an external battery charger is supplied as a standard accessory .


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1.3 Instrument code

Table A Type of instrument

A Basic instrument for mV, mA and thermoelectric signals (thermocouples)measurement and simulation,manufactured upon intrinsically safety standardsCESI-CENELEC EEx ia IIC T6, supplied in a leather carrying case.

Rtd Same specifications as 3901 I.S.-A but with a built- in active module (EurotronPatent n. 206327) for resistance and resistance thermometer measurement andsimulation, manufactured upon intrinsically safety standards CESI-CENELECEEx ia IIC T6.

Table B Battery charger power supply

1 110-120 Vac 50/60 HzUSA type mains plug

2 220-240 V 50/60 HzSCHUKO type mains plug

3 220-240 V 50/60 HzU.K. type mains plug

4 220-240 V 50/60 HzEuropean type mains plug

9 Special

3901- I.S. - A - B


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1.4 Specifications

•• IN/OUT parameters:mV,mAtype J, K, T, R, S, B, N, C, E, U, L thermocouples(only on 3901 I.S.-Rtd) : Ω Pt100 and Ni100 resistance thermometers

•• Reference junction compensation:automatic with Pt100 sensor external with manual setting from -50°C to +100°C

•• Rj compensation drift:± 0.015°C/°C

•• In/Out rangessee following tables

•• Resolution:see following tables

•• Limits of error:see following tables

•• Common mode rejection:> 130 dB at 50/60 Hz

•• Normal mode rejection:> 60 dB at 50/60 Hz

•• Temperature stability:span ±0.005% of the reading/°Czero ±0.2 µV /°C

•• Output impedance (emf output and Tc):less than 0.5 Ω with maximum current of 0.5mA

•• Input impedance:>10 MΩ

•• Source resistance:1 µV error for 1000 Ω source resistance

•• Resistance thermometer excitation current:0.25 mA

•• Rtd cable compensation:up to 100 Ω

•• Shunt resistance (mA ranges):20 Ω

•• Maximum resistance load:100 Ω ( 20 mA )


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•• Maximum input over voltage dc:± 5V

•• Display:high contrast dot matrix LCD (7x5 dots per character-16 characters)

•• Engineering unit indication:up to 4 characters directly on the display

•• Scale factor:zero and span programmable within -10000 +10000

•• Square root:in combination with scale factor (display limited 0...+2500)

•• Calibration:automatic procedure

•• Power supply:internal sealed group of rechargeable ( Ni-Cd ) batteries manufactured as per intrinsic safetystandards

•• Batteries life:6 hours on measuring function5 hours on measuring function for Rtd option2 hours for 20 mA simulation

•• Recharge time:12 hours with instrument switched off (at 90% of charge)

•• Batteries voltagevalue indicated on the display

•• Program release identification:release code show on the display

•• Ambient temperature range:from -5°C to +50°C

•• Storage temperature range:from -25°C to 60°C

•• Case:ABS with internal metal coating

•• Dimensions120x60x230 mm

•• Weights:net 1 Kggross with packaging 2.5 Kg


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1.4.1 Table of ranges and accuracies

IN /OUT Ranges Resol.

Calib.Accuracy

(±±)Conf.

Convers.Accuracy

(±±)

RSSAccuracy

(±±)

RSSoverall

accuracyas % ofspan (±±)

Overallaccuracyas % ofspan (±±)

J -180 +930°C-292 +1706°F

0.1°C1°F

0.1°C0.18°F

0.1°C0.18°F

0.15°C0.27°F

0.21°C0.39°F

0.019%0.019%

0.032%0.032%

K -160 +1250°C-256 +2444°F

0.1°C1°F

0.1°C0.18°F

0.1°C0.18°F

0.2°C0.36°F

0.25°C0.44°F

0.018%0.016%

0.029%0.027%

T -160 +400°C-256 +752°F

0.1°C1°F

0.1°C0.18°F

0.1°C0.18°F

0.2°C0.36°F

0.25°C0.44°F

0.044%0.044%

0.072%0.072%

R 0 +1760°C+32 +3200°F

1°C1°F

0.4°C0.72°F

0.15°C0.27°F

0.6°C1.1°F

0.74°C1.3°F

0.042%0.042%

0.066%0.066%

S 0 +1760°C+32 +3200°F

1°C1°F

0.4°C0.72°F

0.15°C0.27°F

0.6°C1.1°F

0.74°C1.3°F

0.042%0.042%

0.066%0.066%

**B +550 +1820°C+1022 +3308°F

1°C1°F

0.4°C0.72°F

0.15°C0.27°F

0.7°C1.26°F

0.82°C1.5°F

0.065%0.065%

0.099%0.099%

C 0 +2300°C+32 +4172°F

1°C1°F

0.5°C0.9°F

0.15°C0.27°F

0.8°C1.44°F

0.96°C1.72°F

0.042%0.042%

0.064%0.064%

U(T DIN)

-160 +400°C-256 +752°F

0.1°C1°F

0.1°C0.18°F

0.1°C0.18°F

0.2°C0.36°F

0.25°C0.44°F

0.044%0.044%

0.072%0.072%

L(J DIN)

-200 +700°C-328 +1400°F

0.1°C1°F

0.1°C0.18°F

0.1°C0.18°F

0.2°C0.36°F

0.25°C0.44°F

0.020%0.026%

0.033%0.042%

N 0 +1250°C+32 +2372°F

0.1°C1°F

0.1°C0.18°F

0.1°C0.18°F

0.2°C0.36°F

0.25°C0.44°F

0.020%0.018%

0.033%0.034%

E -200 +700°C-328 +1400°F

0.1°C1°F

0.1°C0.18°F

0.1°C0.18°F

0.2°C0.36°F

0.25°C0.44°F

0.028%0.028%

0.045%0.045%

F 0 +1100°C+32 +2462°F

0.1°C1°F

0.1°C0.18°F

0.1°C0.18°F

0.2°C0.36°F

0.25°C0.44°F

0.023%0.018%

0.037%0.033%

Pt100IN (1)

-200 +850°C-328 +1562°F

0.1°C1°F

0.1°C0.18°F

0.1°C0.18°F

0.1°C0.18°F

0.18°C0.32°F

0.017%0.017%

0.029%0.029%

Pt100OUT (1)

-200 +850°C-328 +1562°F

0.1°C1°F

0.1°C0.18°F

0.1°C0.18°F

0.2°C0.36°F

0.25°C0.44°F

0.024%0.024%

0.039%0.039%

Ni100IN (1)

-60 +250°C-76 +482°F

0.1°C1°F

0.1°C0.18°F

0.1°C0.18°F

0.15°C0.27°F

0.21°C0.39°F

0.067%0.067%

0.12%0.12%

Ni100OUT (1)

-60 +250°C-76 +482°F

0.1°C1°F

0.1°C0.18°F

0.1°C0.18°F

0.25°C0.45°F

0.29°C0.52°F

0.093%0.093%

0.15%0.15%

ΩΩ INΩΩOUT(1)

0.0 400.0Ω19.0 390.0Ω

0.1Ω0.1Ω

0.05Ω0.1Ω

------

0.1Ω0.1Ω

0.12Ω0.15Ω

0.028%0.039%

0.038%0.055%

mV 0.0 1000.0 100µV 0.1mV --- 0.1mV 0.15mV 0.015% 0.025%

mV 0.00 100.00 10µV 0.01mV --- 0.01mV 0.015mV 0.015% 0.025%

mA (2) 0.00 +20.00 10µA 0.005mA --- 0.01mA 0.012mA 0.056% 0.076%

• The "MicroCal 1" has measurement and simulation range limits extended above the stated positive and negative limits. The portionof extended ranges has incremental errors (see next pages).

• ** Thermocouple type "B" always requires an external Rj compensation.• The overall accuracy statements do not contemplate the uncertainty of the cold junction calibration equal to ±0.15°C at the reference

temperature.• Accuracy shown are based on test at 23°C ±1°C for 30 days without autocalibration program.• (1) Available only on model 3901-Rtd. Simulation mode stated accuracy for exitation current of 1mA ±±0.1 mA.• (2) For I.S. approval the instrument can generate a signal 0 to +20.00 mA on a load maximum resistence of 100ΩΩ .


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1.4.2 Extended ranges and related accuracies.

IN /OUT Ranges Resol.

Calib.Accuracy

(±±)Conf.

Convers.Accuracy

(±±)

RSSAccuracy

(±±)

RSSoverall

accuracyas % ofspan (±±)

Overallaccuracyas % ofspan (±±)

J -210 +930°C 1°C 0.15°C 0.1°C 0.25°C 0.31°C 0.028% 0.044%

K -260 +1340°C 1°C 0.8°C 0.1°C 1.3°C 1.53°C 0.096% 0.14%

T -265 +400°C 1°C 0.8°C 0.1°C 1.3°C 1.53°C 0.23% 0.34%

R -50 +1760°C-58 +3200°F

1°C1°F

0.5°C0.9°F

0.15°C0.27°F

0.8°C1.44°F

0.96°C1.72°F

0.053%0.053%

0.081%0.081%

S -50 +1760°C-58 +3200°F

1°C1°F

0.5°C0.9°F

0.15°C0.27°F

0.8°C1.44°F

0.96°C1.72°F

0.053%0.053%

0.081%0.081%

**B +400 +1820°C+752 +3308°F

1°C1°F

0.5°C0.9°F

0.15°C0.27°F

0.8°C1.44°F

0.96°C1.72°F

0.068%0.068%

0.11%0.11%

U -200 +400°C 1°C 0.2°C 0.1°C 0.3°C 0.38°C 0.063% 0.11%

N 0 +1300°C 1°C 0.15°C 0.1°C 0.3°C 0.35°C 0.027% 0.043%

E -265 +700°C 1°C 0.5°C 0.1°C 0.8°C 0.95°C 0.099% 0.15%

F 0 +1350°C 1°C 0.15°C 0.1°C 0.3°C 0.35°C 0.026% 0.041%

• ** Thermocouple type "B" always requires an external Rj compensation.• The overall accuracy statements do not contemplate the uncertainty of the cold junction calibration equal to ±0.15°C at the reference

temperature.• Accuracy shown are based on test at 23°C ±1°C for 30 days without autocalibration program.The negative full span is correlated to the cold joint temperature.For Tc E, J, L the stated negative span is achievable with cold joint at 0°C : for higher cold joint temperatures the negative span isprogressively limited.


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2 GENERAL FEATURES

2.1 Input and output flexibility

Advanced flexibility of performance has been achieved using microprocessor technology.Each instrument, through a menu-driven procedure, allows measurement or simulation of mV, mA orany normalized IEC/ANSI and DIN thermoelectric sensor J, K, T, R, S, B, C, U, L, N, E, F ( Ni100,Pt100, Ω on model 3901 I.S.- Rtd only).The microprocessor performs automatic polynomial linearization and cold junction compensation toassure high accuracy.°C or °F selection is made directly on the membrane keyboard.

2.2 Self calibration

The hardware-firmware design allows for an automatic calibration of the instrument. A precisereference source (from 0 to 1,000 mV ) and a 0°C reference system are necessary .The calibration procedure is protected by a security code.The calibration of instruments equipped with the optional circuit for resistance and resistancethermometers requires, in addition, a standard resistor of 400 Ω (±0.02% accuracy) and an ohmmeter.

2.3 Keyboard

A tactile polycarbonate membrane keyboard, with a working life of one million operations per key, sealsthe internal electronics from the surrounding environment.Contact closure of membrane keys is acknowledged, as a coded signal, directly by the microprocessor.Two membrane slidewires (Patent Pending) permit operator to select any simulation parameter value.

2.4 Display

The alphanumeric dot matrix LCD display (7x5 dots per character-16 characters) allows easy readingeven in poor light conditions.Active functions (measured or simulated value) engineering unit and type of sensor or parametersymbol.

2.5 Scale factor function

Easy menu driven set-up to read or simulate electrical signal value in terms of engineering units.Four alphanumeric characters, selected from an internal library, are settable on the display to show thesymbol of the parameter ( i.e. mbar, % RH, % CO, etc. ).The display will indicate the scaled input/output value.

2.6 Square root function

Can be programmed during the installation procedure (linear ranges only) to obtain direct readings offlow from a dP transmitter signal. The display limits are 0 and +2500.


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2.7 Average measurements

The measurement of unstable input signals is accomplished with a progressive averaging each 32conversions (approximately 10 seconds).

2.8 Multi step or continuous ramp simulation

Menu-driven set up to generate continuous step ramp output.The total time, the start point, the end point and the step size are requested by the set-up procedure torun the program.A manual repeat increment is also possible.

2.9 Case

The case is designed for easy hand held operation and transportation.The body is injection moulded, shock-resistant and self-extinguishing ABS with internal metal coating .A leather carrying case with shoulder strap and i.s. label is supplied with the instrument as a standardaccessory.


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3 PHYSICAL DESCRIPTION

The MicroCal 1 I.S. portable calibrator consists of a rugged and compact case, a mother board with allbase functions, an auxiliary board for resistance and Rtd (only on model cat. 3901 I.S.-Rtd), a tactilepolycarbonate membrane keyboard, an LCD display and a scaled group of four nickel-cadmiumrechargeable batteries.The internal surface of the case is metal coated with a special process to improve the characteristics ofelectrical noise shielding and thermal equalization of all internal circuits.On the MicroCal 1 I.S. the battery container is located on the lower part of the case, and is accessiblethrough a cover fastened by a metal screw.The case has been designed and manufactured using modern CAD/CAM techniques givingconsideration to the manufacturing process and ergonomic characteristics for easy operation andtransportation.The two halves of the case are joined together and fastened by four metal screws located on the backside.The leather case, with shoulder strap, assures better protection of the instrument against mechanicalknocks or scratches; the leather case is supplied with a label which states the serial number of thecalibrator.


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4 FUNCTIONAL DESCRIPTION

The block diagram of the MicroCal 1 I.S. portable calibrator is shown below.

External batterycharger

Powersupply

DisplaydriverDisplay

Rj signals

Referencejunction

Digitalinterface

KeyboardMicro

processorD/A

(converter)

Signal outrelayrelay

SwichingIN/OUT

Comparatorand bufferOuput

signalOuputsignal

Gaincontrol

IN/OUTterminals

The instrument functional blocks of the instrument are as follows:

• power supply• microprocessor (central unit + memory)• input circuit• cold junction compensator (Rj)• LCD display• operative keyboard• digital to analog converter

4.1 Power supply

The instrument is powered by an internal sealed group of Ni-Cd rechargeable batteries, equipped withfuse and protective resistance.

BATTERY RECHARGE OPERATIONS MUST BE MADE IN SAFE AREA.

Battery group must be replaced only by another EE520056 battery pack.The voltage of the four batteries in series (approximately 5 V) is connected to the input of an hybridcircuit.Pressing the <ON> key will provide the two levels of voltage for the circuitry of the instrument:

+ 5 V for logic and analog circuits


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- 5 V for analog circuits

4.2 Operative keyboard

The front panel is a tactile polycarbonate membrane keyboard, and has a working life of one millionoperations per key. The contact closure of the membrane keyboard is acknowledged as a coded signalby the microprocessor that recognizes the operators instructions .Keys are interconnected on a 4 x3 matrix; the microprocessor identifies directly the active key .The values of the <UP> and <DOWN> keys ( membrane slidewires) are acknowledged through theconverters built in the microprocessor chip.

ON Power ON switchOFF Power OFF switchUP / DOWN Membrane slidewires to set the simulation value or to scroll the menu of input

tables and library of engineering characters.STO Memory load keys< > Parameters selection or decimal point positionSTART Low limit setting on ramp simulationEND High limit setting on ramp simulationSTEP Step value setting on ramp simulationTIME Total time setting on ramp or step simulation0,1,2 IN/OUT memories°C/°F Technical unit selectionSELECT Set-up procedureAVERAGE Average measurementIN / OUT IN/OUT mode selectionAUTO RAMP Ramp program startPROG X Scale factor programBATTERY Battery voltage indicationENTER Memory load keySHIFT Key secondary function


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4.3 Input circuit

The input circuit is based on an output buffer wired as an error amplifier.The input signal drives the negative channel ( - ) of the output buffer/input amplifier.The microprocessor recognizes if the digital to analog converter is generating a voltage signal higheror lower than the input signal and gives correcting instructions to keep the input amplifier output on thenearest value to zero.In the above conditions the microprocessor will acknowledge the value of the input signal as equivalentto the setting of the digital to analog converter.

+

-IN

D/A µ P Display

Ouput buffer / input amplifier

4.4 Microprocessor

The microprocessor handles all the logic functions of the instrument, performs the linearization for nonlinear transducers, compensates for the reference junction temperature, drives the digital display, andacknowledges all operator instructions.The heart of the circuit is a single-chip microcomputer that utilizes HCMOS technology to provide thelow power characteristics and high noise immunity of CMOS plus the high speed operation of HMOS.The microcomputer provides highly sophisticated, on- chip peripheral functions including: 256 bytes ofstatic RAM, an 8 channel analog to digital (A/D) converter ( used to read the Rj value, the setting of theinput comparator, the battery package voltage and the value of the two membrane slidewires <UP> and<DOWN> ), a serial communication interface (SCI) subsystem, and a serial peripheral interface (SPI)subsystem.The microprocessor works with 8-bit communication bus to the EPROM and EEPROM memories and isinterfaced with a decoder, a latch of address and an inverter-driver.

4.5 Firmware

The operating system firmware handles all logic instructions to the internal peripheral circuits andperforms the mathematical computations of the linearization equations.The block diagram in the fig. 4.5 shows the modular architecture of the operating system firmware.The application system software is resident on the non-volatile memory (EEPROM) of themicroprocessor chip.It is used to store the installation parameters (auto-calibration data, programs data, etc.).

4.6 Digital display

The digital display mounted on an auxiliary board, uses high contrast LCD technology (STN liquid).The character generation is made by a secondary dedicated microprocessor driven by two integratedcircuits with signal input from the bus of the main microprocessor.


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The 16 characters are displayed with a 7x5 dot matrix.

4.7 Digital to analog converter

A 14-bit digital to analog device, driven directly by the microprocessor converts the digital value of theselected parameter into an analog current output.The current signal is converted into a voltage signal across a resistance strip network.Two low thermal emf relays select one of the four available output voltage values as a function of theselected range.The four ranges are:

-10.....+20 mV Tc type R, S, B, C and the negative portion of all Tc thermocouples 0......+54 mV all other thermocouples- 0.2...+100 mV 100 mV range and Rtd (only on model cat. 3901 I.S.-Rtd)- 2......+1000 mV 1000 mV range or 0-20 mA range

P D/A

Keyboard

1000 mV

100 mV

54 mV

22 mV

Out

µ

The above signal, through an output buffer, is sent to an integrated circuit that will generate the voltageor current requested by the operator keyboard settings.

4.8 Battery charger. Operation from mains supply.

The auxiliary module, supplied as a standard accessory, allows operation from 110 -120 V ac or 220-240V ac 50/60 Hz.The calibrator, if needed, can be operated directly from a line source through the charger only in safeareas.The plastic case of the battery charger incorporates the line voltage plug and a cable with connector forconnection to the instrument.The charger circuit is designed with an insulating transformer and a voltage stabilizer circuit.The step-down transformer reduces the power line (110-120 V ac or 220-240 V ac nominal) to a valueof 10 V ac.The above voltage is full wave rectified filtered and stabilized.The output voltage of 7.9 V dc is the ideal value to recharge the internal Ni-Cd battery module.

4.9 Resistance and Rtd measurements (only 3901 I.S.-Rtd model)


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The resistance thermometer (Rtd) is connected to terminals A - B - C in a 3 - wire configuration (seefigure 4.9).Two constant current generators are provided by the auxiliary module for supplying the Rtd.The first half of "IC 1" generates the negative current IA= - 0.25 mA that flows from terminal B toterminal. A through the Rtd and line resistances RLA and RLB.IA is kept constant by the microprocessor that controls the zero voltage level.The second half of "IC 1", with the associated resistors, generates the positive current Ic that flowsfrom terminal C to terminal B through line resistances RLC and RLB.Current Ic is kept exactly = 2 x IA, so the resultant current IB = IC - IA flows through RLB.The input measured signal across terminals A and B is the algebric sum of drop voltages across Rtdand line resistances RLA and RLB. As drop voltages across RLA and RLB are exactly the same (providing that line resistances RLA and RLB are equals ), but with opposite poles, the resultant voltageacross terminals A and B is proportional to Rtd resistance variation, with no influence of line resistance.The measured signal is then handled by the microprocessor that linearizes it and displays thecorresponding value in engineering units.

Rtd

IC1/1

IC1/2

RLA

RLB

RLC

A

B

C IC = + 0.5 mA

IB = IC - IA = + 0.25 mA

IA = - 0.25 mA

4.10 Resistance and Rtd simulation (only on model 3901 I.S.-Rtd)

The MicroCal 1 I.S. portable calibrator cat. 3901 I.S.-Rtd is equipped with an electronic circuit for theactive simulation (Patent n. 206327) of platinum resistance thermometers (Pt100), nickel resistancethermometers (Ni100) and resistances.It is based on the assumption that the instrument to be calibrated will supply the excitation current to thesensor; this current must be between 0.2 and 3 mA ( typical working values ).A lower value will generate an insufficient precision level and a higher current won't permit the simulationof high resistance values (maximum voltage drop on the simulated resistance is 2 V).The excitation current must be applied to the pertinent terminals as indicated in par. 7.1 (simulation).That current, flowing through resistance "Ra" (precision ± 0.01%) will generate a voltage drop that will beamplified and sent to the D/A converter.The output amplifier will simulate the variation of the output resistance as a function of the value set bythe operator through the keyboard.The connection between "+" and "-" terminals must be left open.

P D/A

Keyboard

µ Set Out

Ref

Ouput amplifier

Ra

Instrumentto be

calibrated

Input amplifier


______________________________________20____________________________________________

4.11 Thermocouples input/output circuit

A thermocouple, a temperature sensor, in its most common form consists of two wires of differentcomposition, joined together at one end.The two wires are joined together at two points which have different temperatures.One of the joints is at a known temperature. This joint is, by definition, the reference junction.The reference junction is also often, but less preferably, called the "cold" junction.The temperature of the reference junction can be held constant or its variation electricallycompensated in the associated measuring instrumentation.The second junction is the measuring junction (or "hot" junction).A thermocouple is useful for temperature sensing because it generates a measurable electricalsignal.The signal is proportional to the difference in temperature between the measuring and referencejunctions and is defined, by means of tables, based on the International Practical Temperature Scale.

Measuring junction

Tc wires

Copper wires

emf output

Reference Junction

The portable calibrator MicroCal 1 I.S. has the reference junction located in the negative blackterminal. To improve overall accuracy the terminals are designed with a very low thermal capacity.Inside the body of the negative polarity terminal is placed a thin film Pt100 resistance thermometerthat dynamically measures, with high accuracy, the temperature of the reference junction.The microprocessor uses the above signal (Pt100) to adjust the input signal to compensate for the Rjtemperature.Reference junction compensation can be internal or external, depending upon the applicationrequirements.


______________________________________21____________________________________________

5 UNPACKING

Remove the instrument from its packing case and remove any shipping ties, clamps or packingmaterials.Carefully follow any instructions given on any attached tags.Inspect the instrument for scratches, dents, damage to case corner etc. which may have occurred duringshipment.If any mechanical damage is noted, report the damage to the shipping carrier and then notifyEUROTRON directly or its nearest agent, and retain the damaged packaging for inspection.A label, inside the battery container, indicates the serial number of the instrument.Refer to this number for any inquiry for service, spare parts supply or application and technical supportrequirements.EUROTRON will keep a data base with all information regarding your instrument.


______________________________________22____________________________________________

6 PRE-OPERATIONAL CHECK

The MicroCal 1 I.S. portable calibrator is powered by a sealed group of four Ni-Cd rechargeablebatteries.The external battery charger, supplied as a standard accessory, may be ordered for either 110-120 V acor 220-240 V ac power source.To modify the charger's power voltage follow the instructions in par. 8.2.Before using the instrument carefully verify the nominal voltage value of the charger; in case ofmodification do not forget to correct the pertinent label.The instrument should be used in environments where the temperature does not exceed the specifiedlimits (from -5°C to +50°C) and where the relative humidity is lower than 95%.In case of ÒlowÓ battery condition (voltage lower than 4.6) the display will show the appropriate symbol.

Out 1248.3°C TcK:

An empty symbol means that the battery package has enough energy for about 30 minutes ofoperations.

A black symbol means that the batteries charge is below the minimum acceptable level: operation of theinstrument is no longer possible.In this condition the instrument battery pack must be recharged.

WARNING.

BATTERY RECHARGE OPERATIONS MUST BE MADE ONLY IN SAFE AREAS.


______________________________________23____________________________________________

7 ELECTRICAL CONNECTIONS

Appropriate extension wires should be used between the thermocouple (or instrument undercalibration) and the MicroCal 1 I.S. unless the thermocouple leads permit direct connection.Make sure that both thermocouple and compensating cable are connected with the correct polarity.If in doubt, the polarity of the compensating leads can be checked by connecting a length of lead tothe indicator, shorting the free ends of the wires together and noting that the indicator reading increaseswhen the wires connection is heated.Colour codes of compensating cables change in different countries. Check the appropriate table.For Rtd connection use cable of adequate gauge to lower the overall input resistance.The use of a cable with a good resistance balance between conductors is also necessary.

Thermocouple Wires Coulor code

E Chromel ( + ) Chromel PurpleConstantan ( - ) Constantan Red

J Iron ( + ) Iron WhiteConstantan ( - ) Constantan Red

K Chromel ( + ) Chromel Yellow Alumel ( - ) Alumel Red

R Pt 13% Rh ( + ) Copper BlackPlatinum ( - ) Alloy 11 Red

S Pt 10% Rh ( + ) Copper BlackPlatinum ( - ) Alloy 11 Red

T Copper ( + ) Copper BlueConstantan ( - ) Constantan Red

B Pt 6% Rh ( + ) CopperPt 30% Rh ( - ) Copper

N Nicrosil ( + ) Nicrosil OrangeNisil ( - ) Nisil Red


______________________________________24____________________________________________

7.1 Wiring practice

Although the MicroCal 1 I.S portable calibrator is designed to be insensitive to transient or noise, thefollowing recommendations should be followed to reduce ac pick up in the signal leads and to insuregood general performance.The input leads should not be run near ac line wiring, transformer and heating elements.Input/output leads should, if possible, be twisted and shielded with the shield grounded at the end of thecable.When shielded cables are used the shield must be connected to the positive terminal.The fig. 7.1 show some examples of input/output wiring and connections.

Microcal 1

+

Microcal 1

+

Microcal 1

+

Microcal 1

+

Microcal 1

+

Microcal 1

+

Microcal 1

+

Microcal 1

+

Recorder Rtd (2 wire)

Recorder Rtd (3 Wire)

compensating cable twisted together

Recorder Rtd (4wire)

A

B

C

D

A

B

C

+

-

Rtd (2 wire) Rtd (4 wire)

Rtd ( 3 wire)

MEASURE

SIMULATION

Examples of input /output wiring and connections

A

B

C

A

B

C

A

B

C

B

A

C

A

B

C

C

B

A

C

B

A

C

B

A

Thermocouples, mV, mA

Not connected

Recorder for Tc, mV, mA


______________________________________25____________________________________________

8 OPERATION & APPLICATIONS

The MicroCal 1 I.S. portable calibrator has been factory calibrated before shipment.During start-up the operator should only select and load the pertinent application mode as describedbelow.If the instrument has been manufactured with special thermocouple characteristic curves see notes inthepar. 12 - APPENDIX.

8.1 Rechargeable batteries.

The MicroCal 1 I.S portable calibrator is powered by an internal sealed group of four Ni-Cd rechargeablebatteries, equipped with fuse and protection resistor.The instrument is shipped with an average level of charge.After unpacking, a full charge of the batteries is recommended; connect the instrument to the chargermodule ("OFF" condition) for a period of 12 hours minimum.The Ni-Cd rechargeable batteries do not suffer when used in cyclic operations.Cyclic operation is understood as a method of operation by which the battery is continually charged anddischarged.Note that a battery, at its lower limit of discharge, risks a non uniform cell polarization. This conditionmakes it difficult to recharge with the charger supplied.Avoid leaving the instrument, with batteries totally or partially discharged, for a long time withoutrecharging.To charge the batteries use only the supplied charging module.The module incorporates protection and current limiting devices not normally found in other commercialchargers.

When the MicroCal 1 I.S is connected to the battery charger module, by pressing <SHIFT>+<BATTERY> keys the indication of fig. 8.1.A. will be displayed.

Battery: Line Op

If a numeric value appears, it indicates a correct recharge of the batteries.Replace the battery charger module; if the indication persists contact EUROTRON-Technical AssistanceDepartment.

8.2 Battery charger / Power supplied from power line ac

The external battery charger is configured, before shipment, for a mains supply of 110-120Vac or 220-240Vac, upon order specification.The nominal voltage value is indicated on the front label of the charger; if power supply voltage has to bemodified, correct the indication on the front label.To replace the power plug, loosen the three bottom screws .To modify the power supply voltage place the jumper, mounted on the circuit board of the charger, asindicated in figure 8.2.A :

A B

C


______________________________________26____________________________________________

Jumper Apower line at 220-240 V 50/60 Hz

Jumpers B and Cpower line at 110-120 V 50/60 Hz

WARNING

THE ABOVE OPERATIONS MUST BE PERFORMED IN A SAFE AREA.

8.3 - Power "ON"

CAUTION:

ALL VALUES IN THE FOLLOWING FIGURES ARE ONLY LISTED AS AN EXAMPLE.

During set-up and load memory remember that the instructions of the manual related to key operationhave the following meaning:

<A> + <B> Press the <A> key and keeping the touch on the key, press then the <B> key.<A> , <B> Press in sequence first the <A> key and then the <B> key.

• To power the instrument press the <ON> key.The indication of fig. 8.3.A will appear for a few seconds.

™ Microcal 10 ™

• With power -ON-, the instrument will run an autodiagnostic routine for the self-checking of criticalcircuits and components.

• A positive check will be shown, with the indication of fig. 8.3.B for about one second.

Test OK Ver 4.200

• The number of the right site of the display indicates the version of the memory installed on theinstrument.

• The instrument will go to the previously selected operating mode, as per fig. 8.3.C.

In 1280.6°C TcK:

Faulty conditions will be indicated as described in par. 8.6.

8.4 Battery voltage indication.

• To recall the battery voltage on the display press the <SHIFT> + <BATTERY> keys.


______________________________________27____________________________________________

The indication will be as per fig. 8.4.A.

Battery: +4.9 V

The "low" limit of the battery voltage, for the correct operation of the instrument, is +4.6 V.

• Press any key to reset the operative mode.

• During normal operating modes (measure or simulation), "low battery" condition will be shown asper fig. 8.4.B.

Out 1248.3°C TcK:

An empty symbol means that the battery has enough energy for about 30 minutes of operation.A black symbol means that batteryes charge is below minimum: battery must be recharged.

8.5 Operating mode set-up.

To select the required operating mode follow the procedures indicated below.

8.5.1 IN / OUT function selection

• Switch the instrument -ON-.

• After diagnostic routine the calibrator will be forced into the "IN" function with the active parameterpreviously selected (i.e. with the indication of fig. 8.5.1.A, relative to a measured value of +1032 °Cwith thermocouple type K).

In 1032.2°C TcK:

• Open input terminals will cause a fluctuation of the reading up to "Underflow" or "Overflow"conditions.

• To select the simulation mode press the <IN / OUT> key (the indication will be as per fig. 8.5.1.Brelative to a simulated value of 0 °C for thermocouple type K).

Out 0.0°C TcK:

• The output value can be adjusted by pressing <UP> or <DOWN> keys.

• Keep the key pressed to cause a continuous variation of the simulated value; the speed of variationwill change by moving the pressure to the extremity of the keys.

• By touching a point, near the two central zones, the value will increase or decrease by one singledigit.


______________________________________28____________________________________________

• Press simultaneously <UP> and <DOWN> keys to set to zero the simulated value.

8.5.2 Parameter or sensor selection

To select the electrical parameter or the sensor required by the application, in any measuring orsimulation function, follow the procedure indicated below:

• Switch the instrument -ON-

• Press the <SELECT> key: the display will show one of the menu pages, as indicated in fig. 8.5.2.A.The symbol "?" indicates the possibility to carry a special linearization upon customer request.In this case the appropriate symbol will replace the "?" on the display.

mV mA X J K T ª

mV mA X R S B C

mV mA X U L N E

mV mA X ? F ÿ ΩΩ

• Press <UP> or <DOWN> key to select the appropriate page.

• Select the required parameter or sensor, by moving left or right the flashing cursor with keys < < > or< > > (i.e. to activate the thermocouple type T choose the page and cursor position as indicated infig. 8.5.2.B).

mV mA X J K T ª

• Press the <ENTER> key to load the selection in the memory ; the instrument will return to theprevious function with the new selected parameter.

• By pressing any other key, instead of <ENTER>, the instrument will not acknowledge any variationand return to the previous parameter or sensor.

Note"Ω", "Ni"(Ni100) and "Pt" (Pt100) are always on the menu but their activation is possible only oninstruments model 3901 I.S.-Rtd.

8.5.3 °C/°F selection

• To change the technical unit from °C to °F (or viceversa) press the keys <SHIFT> + <°C / °F> , (i.e.from the reading in °C of fig. 8.5.3.A we will obtain the reading in °F of fig. 8.5.3.B.).


______________________________________29____________________________________________

In -12.0°C TcK:

When changing engineering units from °F to °C we obtain integer values.

In 10.0°F TcK:

When in simulation mode, the change of engineering unit from °C to °F ( and viceversa ) will onlyconvert decimal values into integer ones.

8.5.4 Decimal point position

The decimal point position, to increase or decrease the resolution upon the application, is made bypressing keys < < > or < > > .The instrument will automatically convert values in °C from decimal to integer (and viceversa) when theyare in the range limits stated in par 1.2.1 and 1.2.2 .Decimal conversion is not possible for values in °F (always integer values) or in mA (always with twodecimal points), while for values in mV the conversion increases (or decreases) the decimal value by onedecimal point.

8.5.5 Average readings

The use of the "Average" function is advised with unstable input signals.The average represents a progressive integration of the input signal on the last 32 conversions(approximately 10 seconds).

• To enable the "Average" mode press keys <SHIFT> + <AVERAGE>

The display will show the indication of fig. 8.5.5.A .

Avg 128.6°C TcK :

• To disable the "Average" mode press again <SHIFT> + <AVERAGE> keys.

8.5.6 IN / OUT data memories

The availability of a 3-step memory represents an important feature either in simulation or inmeasurement modes.In the measurement mode it can be useful to store 3 input values pertinent to special test conditions.In the simulation mode, the permanent availability of 3 calibration values can be useful , i.e. , during thecalibration of the scale of a recorder.

• Either in measure or simulation mode to load memory press keys:<SHIFT> + <0><SHIFT> + <1><SHIFT> + <2>

• The memory loaded values can be manually recalled by pressing the pertinent <0>,<1>, <2> keys.


______________________________________30____________________________________________

8.5.7 Ramp program

The instrument, through an easy to follow menu-driven set-up, can be programmed for simulating acontinuous or step ramp output.By programming the incremental steps to its minimum value (0.1°C or 1°C resolution) the step ramp canbe assimilated to a continuous ramp.Select first the technical unit (°C or °F), the type of thermocouple and then follow the procedure indicatedbelow.

The procedure will consider the simulation in "°C" for thermocouple type "K".

• To enter the set-up procedure press the <SHIFT> + <TIME> keys; the display indicated in fig. 8.5.7.Awill appear

Time +50 Sec

• Press <UP> or <DOWN> keys to adjust the total time of the program from 0 to 1000 seconds.

• Set the -TIME- to 0 sec to obtain a manual repeat increment each time the <AUTORAMP> key ispressed.

• To load the value in the memory press <ENTER> + <TIME> keys.

• Press <START>, <END> or <STEP> keys to read the previously set parameters of "start limit", "endlimit" and "step value" as indicated below .

• Press the <START> key to obtain the indication as per fig. 8.5.7.B.

Start +0.0°C TcK

• Press the <UP> or <DOWN> keys to set a new value.

• Press <ENTER> + <START> keys to load the new value in the memory.

• Use the same procedure to set the "end limit" and the "step value" through <END> and <STEP> keys.

• Press <END> key to obtain the indication as per fig. 8.5.7.C.

End +1000.0°C TcK

• Press the <UP> or <DOWN> keys to set a new value .

• To load the new value in the memory press <ENTER> + <END> keys.

• Press the <STEP> key to obtain the indication as per fig. 8.5.7.D.

Step +10.0°C TcK

• Press the <UP> or <DOWN> keys to set a new value.


______________________________________31____________________________________________

• Press <ENTER> + <STEP> keys to load the new value in the memory

• To exit the set up procedure press either < < > or < > > key.The instrument will return to the function previously in use.

• To start the ramp program set the instrument in simulation mode (see par.8.6.1) and press <AUTO-RAMP> key.On the display will appear the indication of fig.8.5.7.E.

Prg +210.0°C TcK

Keep in mind that the program will cycle continuously until any other key is pressed.

Application NoteDuring the set-up procedure the operator must consider the limitation on steep ramps due to theminimum time required by the step generation (30ms).For a correct set-up take into consideration the following equation:

Time StepEnd Start

×−

> 0 03.

If the above requirement is not full filled the operator can still estimate the actual time using the followingequation:

TimeEnd Start

Step=

−× 0 03.

Example:In the case of the following set-up:

Start = 0End = 1000°CStep = 1°CTime = 10 sec.

10 11000 0

101000

0 01×−

= = .

The result of the equation does not meet the correct requirements as 0,01 is lower than 0,03. Thereforethe total time of ramp will be:

Time =−

× =1000 0

10 03 30. sec

To obtain a total time of 10 sec., the operator should set the step value at 3°C.

8.5.8 Rj compensation mode check

The internal / external reference junction compensation is only enabled for temperature measurement orsimulation with thermocouples.A feature is provided to check the type of reference junction mode previously installed.


______________________________________32____________________________________________

• During both simulation or measuring mode press the <SELECT> key to enter the type of sensor orparameter selection page (as shown in par. 8.5.2).

• Press the <IN/OUT> key to obtain the indication of fig.8.5.8.A.

RJ : Internal

The above reading indicates that the instrument is preset with an internal automatic referencejunction compensation.If a numeric value is displayed in place of the code "INTERNAL", this means that an externalreference junction compensation has been selected .The reference junction compensation mode can be reprogrammed as indicated in par. 8.5.10.2.

8.5.9 Scale factor program

The "scale factor" mode is a method to read or to simulate electrical signals values in terms ofengineering units.The example explains the procedure of installing the "scale factor" function for the calibration of apotentiometric recorder with a scale from 0.0 mbar to 400.0 mbar corresponding to an electrical linearinput signal from 4 to 20 mA.

• Press <SHIFT> + <PROGRAM X> keys; the display will be as per fig. 8.5.9.A.

LO: 0.0 Prog

• Press one of the < < > or < > > keys if a decimal point shift is required.

• Press the <UP> or <DOWN> keys to adjust to the required value.

• Press the <ENTER> key to load in the memory the value and to advance the program one step : thedisplay will be as per fig. 8.5.9.B.

HI: 400.0 Prog

• Press the <UP> or <DOWN> keys to adjust the full scale value.

• Press the <ENTER> key to load in the memory the value: the display will indicate one of the menupages shown in fig. 8.5.9.C.

Type : 0-100 mV

Type : 0-1000 mV

Type : 4-20 mA

Type : 0-20 mA

Type : 0-400 Ω


______________________________________33____________________________________________

• Select, through <UP> or <DOWN> keys, the page required and load in the memory the neededparameter by pressing the <ENTER> key

Note :The indication "Type: 0-400Ω" will be available only on instrument model 3901 I.S -Rtd.

The display will indicate one of the two menu pages shown in fig. 8.5.9.D. The first page indicatessquare root mode.

Mode : Linear

Mode : Square

• Press the <UP> or <DOWN> key to select the required page.Load the selection in the memory with <ENTER> key.The program will advance to the next step with an indication as per fig. 8.5.9.E.

WORD: ßßßß

This procedure allows the setting of four alphanumeric characters as a symbol of the measured orsimulated parameter.

• By pressing keys < < > or < < > the desired character, identified by being underlined, will beactivated.

• Press <UP> or <DOWN> keys to scroll the internal library of characters and symbols (seeFig.8.5.9.F) and select the pertinent one.

Library of characters

7 8 O P g h

! 6 9 N Q f i

" 5 : M R e j )

# 4 ; L S d K |

$ 3 < k T c l )

% 2 = J U b m z

& 1 > I V a n y

' 0 ? H W \ o x

( / @ G X _ P w

) . A F Y ^ q v

* - B E Z ] r u

+ , C D [ s t

.....

.

.

.

.....

.

.

.

.....

.....

..

..... .


______________________________________34____________________________________________

i.e. by a proper setting you can obtain words as per fig.8.5.9.G.

WORD: mbar

WORD: % RH

If the application does not require a dedicated symbol, but the display of the electrical parameter (i.e.mV, mA, Ω), leave on the display the four arrows (see fig. 8.5.9.E)With a random display indication remember that the four arrows will be settable, through single digitsetting, by pressing the <UP> key on its higher side, for a few seconds.

• Press the <ENTER> key to load in the memory the symbol.

• The "scale factor" mode will be activated by the <SELECT> key.Move the flashing cursor on the portion "X"; then press the <ENTER> key.The display will indicate the scaled input / output value.

8.5.10 Installation parameter mode

• To start this procedure press the <ENTER> key before switching the instrument -ON-.The display is as in fig. 8.5.10.A; the numerical value indicated is only an example.

CAL : +10088 N-0

ATTENTION

IN ALL BELOW PROCEDURE STEPS AVOID PRESSING KEYS <SELECT>, <ENTER> OR <0>.THE ABOVE KEY COMBINATIONS SHOULD BE USED ONLY DURING THE

CALIBRATION PROCEDURE

8.5.10.1 Program release code

From the above step of the procedure it is possible to display the memory program release code .

• Press the <IN/OUT> key.The reading on the display indicates that the instrument is equipped with a memory release code4.200 (see fig. 8.5.10.1.A).

Version 4.200 ™

The above information is extremely useful to understand the update status of the instrument and tosimplify information exchange with EUROTRON engineers during repair or service operations.

• Press any key to exit the procedure. The display will be as in fig. 8.5.10.A.

• Switch the instrument -OFF- to end this step of the program procedure.


______________________________________35____________________________________________

8.5.10.2 Reference junction compensation set-up

• From step 8.5.10 you can set the appropriate Rj compensation. The display is as in fig. 8.5.10.2.A

CAL 10088 N=0

• Press the <AUTORAMP> key : the display will be as in fig. 8.5.10.2.B.

RJ : Internal

• If the application requires an internal automatic reference junction compensation call the code"INTERNAL" by pressing the <UP> key.

• If the application requires a remote reference junction compensation (i.e. the internal temperature ofa remote, field mounted, temperature controlled junction box) set the required temperature valuethrough the <UP> or <DOWN> keys.

• Press the <ENTER> key to load in the memory the required type of reference junction compensation.The display will indicate the reading of fig. 8.5.10.2.A.

• Switch the instrument -OFF- to end the program procedure

8.6 Faulty operating conditions

During start up, measuring and simulation modes, faulty conditions of the instrument will be announced,with coded messages as follows:

Error Checksum 1 Indicates a possible loss of data on “AUTORAMP”

program or on the manual memories

Error Checksum 2 Indicates a possible loss of data on “PROGRAM X”

Error Checksum 3 Indicates a possible loss of data on “AUTORAMP”,

“PROGRAM X” and/or on the manual memories

Error Checksum 4Indicates a possible loss of calibration data

Error Checksum 5Indicates a possible loss of calibration data, and/or“AUTORAMP” data and/or on the manual memories

Error Checksum 6Indicates a possible loss of calibration data, and/or“PROGRAM X”data


______________________________________36____________________________________________

Error Checksum 7Indicates a possible loss of calibration data, and/or“AUTORAMP” data, “Xscaling” and from the threemanual memories

!!! ERROR 9 !!! Indicates a data writing on the EEPROM memory not

verified.

IF THE FAULTY CONDITION IS CRITICAL FOR THE TYPE OF APPLICATION, IT IS RECOMMENDED TO RE-RUN THE PERTINENT

SET UP PROCEDURE.

- UNDER - Indicates “underflow” conditions

+ OVER + Indicates “overflow” conditions

ERROR 2 Indicates an environment temperature (in

correspondence with <IN/OUT> terminals) exceedingthe stated limits

ERROR 6 Indicates that the load is exceeding the stated limits.

When in mA “OUT” function, the external load mustnot exceed 1000 Ω.When in mV or Tc “OUT” function the current flowmust not exceed 0.5 mA.

ERROR 7 Indicates a possible error during scale factorcomputation

ERROR 0 For Tc E, J and L the stated negative span isachievable with internal cold joint compensation at0°C or external with max 50°C adjustment.For higher cold joint temperatures the negative spanis progressively limited.The error code indicates that either the simulatedvalue or the cold joint temperature is exceeding thelimits.

The above indicated faulty conditions can be announced both during the autodiagnostic routine or inmeasure or simulation modes.

IF THE FAULTY CONDITION IS CRITICAL FOR THE TYPE OF APPLICATION, IT IS RECOMMENDED TO RE-RUN THE PERTINENT

SET UP PROCEDURE.


______________________________________37____________________________________________

9 MAINTENANCE

The MicroCal 1 I.S. portable calibrator has been factory tested and calibrated before shipment.The calibration should be verified and re-adjusted if the instrument is showing an error exceeding thedeclared specifications or when a critical active or passive component is replaced (either at componentlevel or at board level)EUROTRON will supply, on request, a technical reference manual, with all instructions andrecommendations for calibration.EUROTRON engineers will give prompt support for any requests of assistance.The I.S. omologation rule indicates that Instrinsic Safety Enquirement should be repaired only by themanufacturer directly or by a Laboratory authorized by the manufacturer.Therefore any alterations, modifications and/or repairs made by un-authorized body will automaticallyvoid the omologation and will transfer the product's liability to the company that has carried out the work

9.1 Safety recommendations

Primary elements (i.e. thermocouples, resistance thermometers, etc.) are normally linked to electricalpotentials equal or near to the ground potential. However, in some applications, there may be present acommon mode voltage to earth.Check for voltage between input terminals and ground, as this voltage can be transmitted to otherdevices connected to the calibrator.

9.2 Spare parts

EE 620007 Battery holderEE 620008 Ni-Cd rechargeable battery 1.25 V ( min. 4 pcs.)EE 730008 SCHUKO type power plugEE 730009 European type power plugEE 730010 UK type power plugEE 730011 USA type power plugBB 880003 Leather carrying case with shoulder strap

BB 290003 Battery charger module set at 220/240V ac SCHUKO mains plugsBB 290002 Battery charger module set at 110/120 V ac

USA mains plugBB 290011 Battery charger module set at 220/240 V ac

UK mains plugBB 290012 Battery charger module set at 220/240 V ac

European mains plugBB 530001 Auxiliary module for TTL/RS 232 conversion

9.3 Storage

If the instrument is left unused for a long time, it is recommended to remove the batteries.Store the instrument in the original package, at a temperature from -30¡C to +60¡C, with R.H. less than90%.If the instrument has been unused for a month check the battery voltage, and charge the Ni-Cd batteriesfor at least 12 hours.


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10 CERTIFICATES

10.1 Warranty

Each instrument is shipped with a certificate of warranty that indicates the validity conditions of thewarranty itself.

EUROTRON2 years

Warranty

EUROTRON warrants its products against defects in materials and workmanship for a period of 2 yearsfrom the date of original retail purchase.Any misuse, abuse, or non EUROTRON authorized alterations, modifications and/or repairs to theEUROTRON product will void the warranty. If you discover a defect, EUROTRON will, repair or replacethe product, provided you return the product during the warranty period, transportation prepaid, toEUROTRON.This warranty applies to the original purchaser only.Please include a copy of the original invoice or a small service charge may be applied.Prior to returning the product for warranty consideration, call EUROTRON Technical Support for areturned material authorization number and shipping instructions.

10.2 Certificate of conformity

Each instrument is shipped with a numbered Letter of Conformity, to grant that the characteristics of theinstrument correspond to the required ones, and that the instrument calibration is traceable to theNational and International Standards.

StatementThis is to certify that the above instrument has been manufactured and inspected to documentedprocedures and where applicable calibrated against standards which are traceable to National andInternational Standards.The instrument has been found to conform in all respects to specifications, drawings, workmanshipstandards and work order requirements.

10.3 CESI certificate of conformity

Each I.S. instrument manufactured by EUROTRON is supplied with a copy of CESI certificate whichstates that the instrument is in conformity with the European standardEN 50.014 - 1977 + A1ÖA4 ( CEI 31.8 )EN 50.020 - 1977 + A1 ( CEI 31.9 )for electrical instrumentation to be used in hazardous areas.


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11 SUPPORT documentation

The following publications are available on request:

EE 800041 Thermoelectric sensors conversion tables

EE 850080 Reference technical manual.


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12 APPENDIX

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MM850079-04 MicroCal 1IS

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