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Conductivity / resistivitytransmitter – 4/20 mA “2 wire”Monec 8964 and Monec 8964data sheetFeaturesMicroprocessor operated industrial transmitter”2 wire” 4 – 20 mA transmitterInputs and outputs isolatedDigital display by LCDMeasurement of either conductivity or resistivityProgramming keyboard with tactile keys, UV resistantSelf–checking, including error reportingPt100 for temperature measurement and compensationLinear, non–linear temperature compensation for ultra pure water•IP 65 (DIN40050) protected enclosureModel 8964 EEx ia IIC T5 n° 91 C 6045 X (L.C.I.E.) intrinsically safeequipment according to CENELEC

SpecificationsTransmitter Sensors inputs 2 electrodes Kohlrausch cellMeasuring rangeCellScope of measurementconstant Conductivity Resistivity0.01 0.01 µS/cm–100 µS/cm 10 kV.cm–100 MV.cm0.10 0.11 µS/cm–101 mS/cm 1 kV.cm– 10 MV.cm1.00 1 µS/cm–010 mS/cm 0.1 kV.cm– 1 MV.cm10000 10 µS/cm–100 mS/cm 0.01 kV.cm–100 kV.cmElectricalMeasuring frequency Select between 70 Hz and 1100 HzTemperature– Automatically with Pt100 or manually in steps of 0.1°CselectableCompensation– Non–linear compensation for measurement in ultrapure waterTemperature coefficient Adjustable in steps of 0.1 %/°C within 0 – 10%/°CReference temperature 25°C (77°F)Error of measurement ± 2%Temperature accuracy ± 0.3°C (32.5°F)Power requirements 15.5 at 30 VDC intrinsically safe operation requires a certifiedpower supply with U < 30 V and I < 100 mAResponse time (t90) t90 < 5 sMeasuring cycle (t90) < 5 sSignal outputs4–20 mA, load 725 V max. Linear or logarithmicIsolation input/output 2000 VDCAccuracyLinear output 0.5% FSD. Logarithmic output 1.5% FSDDisplays4 digits LCD display, 14 mm height of digitsDisplay accuray ± 1 digitCalibrationSlope adjustement (constant cell adjustment)Measuring range – Linear: within 90% to 1/10000 of the upper endOutput signal– Logarithmic: 2 decadesSample holdDuring calibration, the retained output signal represents the lastmeasurement prior to calibrationData protection in case All parameters are software storedof power failureTerminalsSpring–type wire 2.5 mm 2 max.ProgrammingPolycarbonate membrane – switch keyboard including 4 tactile keysConnections I Model 8964 (2 wire) Power supply: 15.5 V < U < 32 V, current: 20 mA min.II Model 8964In order to meet the specifications for intrinsic safety, theauxiliary power must be supplied by a certified, intrinsically safepower supply.Protection “ia” or “ib”: U < 30 V icc < 100 mA, linearProtection “ib”: U < 30 V icc < 25 mA, non–linearAt 30 V, the permissible load is 725 V as shown by the followingequation:R LV =Ual - 15.52 x 10 –2R = Load in VU = Minimun voltage in VMaterial Material: Epoxy–coated cast aluminiumProtection:IP65 according to DIN 40050 (Nema 4) for wall mountingDimensions:165 H x 165 W x 93 D mm (6.5 H x 6.5 W x 3.7 D in)Dimensions includinginstalled cable glands: 192 H x 165 W x 93 D mm (7.6 H x 6.5 W x 3.7 D in)Cable glands: 1 x PG 11 – 1 x PG 13.5Material: Stainless SteelStorage temperature: –20 to +75°C (–4 to 167°F)Ambient temperature: –10 to +50°C (–4 to 122°F)Weight:1.9 kg (4.2 lbs)Packaging:The transmitter is shipped in a carton

Galvanic separation! Operating principleI+I-Output4-20mAPowersupplyOpticalreceiverAmplifier gaincontrolOscillatorG = 1 or 1/100Rx4,5 VOV- 4,5 VAmplitudedetection(phasesensitive)AmplifierimpedancematcherG = 1 or 10EEPROMOpticaltransmitterAnalog-todigitalConverterLCD Display7.00EPROMMicro controllerSelectKeyboardTemperaturemeasurementEnterTwo–wire transmitters are characterized by two4–20 mA leads serving both as a power supply and as asignal transmission line. Powered by a continuous voltagewhich is half used, it regulates its current consumptionfollowing the measuring value to display. Therefore“2 wire” provides enough current to power the instrumentand display the measurement.The measuring cell is powered by a sinusoidal of knownamplitude. This voltage is delivered by a generator oflow output impedance in order to minimize the effects ofcable capacity. An amplifier converts the current goingthrough the probe into a voltage measured through asynchronous detection device. It removes the effects ofexternal capacities and interferences.PtConnection diagram43 2159687Power Supply/Transmitter/ProbeIntrinsically safe installations inhazardous areas require an appropriatelycertified power supply.1. Ex zone2. Two–wire transmitter3. Signal cable4. Sensor5. Two–wire cable connectingthe transmitter with thepower supply6. Two–wire power supply7. Output signal 4–20 mA8. Mains 220 VAC, 50/60 Hz9. Safe zoneThe terminals have the followingfunctions:1. measurement cable shield,2. measurement input connected to theprobe’s external electrode,3. oscillator output connected to theprobe’s central electrode,4 and 5. Pt100 probe connection,6 current output (–),7. current output (+),8. earth.

International HeadquartersZellweger Analytics SA - Polymetron division33, rue du Ballon93165 Noisy-le-Grand cedex - FranceTel : (33) 1 48 15 80 80 - Fax : (33) 1 48 15 80 00Members of theZellweger Analytics Division(6’)Dimensions in mm (in)(3.7’)GermanyZellweger Analytics GmbHSollnerstrasse 65bD-81479 MünchenTel : (49) 89-79-19-20Fax : (49) 89-79-19-243ItalyZellweger Analytics S.r.l.Via Primaticcio, 168I-20147 MilanoTel : (39) 2-48-339.1Fax : (39) 2-48-30-23-14IndiaForbes Zellweger AnalyticsA 34/35, MIDC Estate“H” BlockPimpri, Pune 411 018Tel : (91) 212-770-171Fax : (91) 212-777-049BeneluxZellweger AnalyticsChaussée de Louvain AB-1932 ZaventemBelgiumTel : (32) 27-14-03-11Fax : (32) 27-14-03-44SingaporeZellweger Analytics Ltd.84 Tuas Avenue 11Singapore 639 098Tel : (65) 862-77-01Fax : (65) 862-38-58SpainZellweger Analytics SA.Avda Remolar, 31El Prat de Llobregat8820 BarcelonaTel : (34) 93-379- 96-11Fax : (34) 93-379-85-51United KingdomZellweger Analytics Ltd.Parsonage Road, TakeleyBishops Stortford,Herts CM22 6PUTel : (44) 1-279-870-182Fax : (44) 1-279-870-377USAZellweger Analytics Inc.100 Park AvenueLeague CityTexas 77573Tel : (1) 281-316-7700Fax : (1) 281-316-7800(6’)! Product list(6.5’)Pos. Description Model Item No.1 Two-wire transmitter 8964 08964=A=10002 Two-wire transmitter 8964 08964=A=1500Instruction Manuals3 English BAF 8964 621=089=0644 German BAE 8964 621=189=0645 French BAD 8964 621=289=064(6.7’)(7.9’)! AccessoriesThis publication is not intended to formthe basis of a contract and thecompany reserves the right to amendthe design and specifications of theinstruments without notice.DistributorDescriptionModelItem No.Cable to connect the transmitter with the probe:• 4–conductor, shielded cable, 2664 588 800.29050(4 x 0.5 mm2)• Power supply sl “ia” 21000=A=0021220 V / 24 VCC100 H x 50 W 75 D mm (4 H x 2 W x 3 D in), mounting DIN rail! Standard accessories• 1 cable gland PG 11• 1 cable gland PG 13,5• 1 Instruction manual in English, German or French. (Please specify)These accessories are included with each instrument.TE 8964=A=100 - Rev. B - FR. 50622048726