Endress+Hauser Liquiline M OM42 Manual

Technical Information
Liquiline M OM42
Two-wire transmitter for Ex and non-Ex areas
Analog sensors: pH/ORP / Conductivity / Concentration / Resistivity
Digital sensors: pH/ORP / Oxygen / Conductivity
Application Your benefits
Liquiline M OM42 is a modular two-wire transmitter for all • Cost-saving:
areas of process engineering. – Simple commissioning with Quick Setup
andDepending on the ordered version, Liquiline has one or two Navigator (multifunction button)
analog current outputs or it can be connected to field buses as – Thanks to Memosens technology, a calibration in
per FOUNDATION Fieldbus, PROFIBUS PA and Hart protocol the plant is not required.
The extremely robust, corrosion-resistant plastic version and – Predictive maintenance system detects when a
the hygienic stainless steel version are designed for the sensor has to be cleaned, calibrated or replaced
following applications: – Less storage thanks to modular design
• Chemical processes • Safe:
• Pharmaceuticals industry – Active display of cable interruption with Memosens
• Foodstuff technology Version
• Applications in hazardous locations – User-guided commissioning, graphic display and
plain text guidance
– Approvals: ATEX, FM, CSA, NEPSI
– Code-protected commissioning and calibration
• Industry solutions:
– Modular concept: sensor module replaceable
TIIA3C/01/en – Asset management (Fieldcare, W@M)

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Table of contents
General features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Modular design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Quick setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Navigator and plain text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Sensor monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Process check system (PCS) . . . . . . . . . . . . . . . . . . . . . . . . . 4
Memosens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Software packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Special features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
pH / ORP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Oxygen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Measuring system . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Binary input (Memosens): pH/ORP, Oxygen, Conductivity . . . 9
Analog input: pH / ORP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Analog input: Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Output signal range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Ex specification current output 4/20 mA . . . . . . . . . . . . . . . . . .12
Ex specification PROFIBUS PA and FOUNDATION Fieldbus .13
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Housing grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Supply and signal circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Sensor connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Sensor connection: digital sensors (Memosens)
pH/ORP/ISFET/Oxygen/ Conductivity . . . . . . . . . . . . . . . . . . .18
Sensor connection: analog pH / ORP sensors . . . . . . . . . . . . 18
Sensor connection: analog conductivity sensors . . . . . . . . . . .22
Performance characteristics. . . . . . . . . . . . . . . . . . . . 24
pH / ORP (analog and digital sensors) . . . . . . . . . . . . . . . . . . .24
Conductivity (analog and digital sensors) . . . . . . . . . . . . . . . . .24
Oxygen (digital sensors) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Maximum measured error of current outputs . . . . . . . . . . . . . . 25
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Mounting plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Weather protection cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Mounting options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Installation in Ex area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Ambient temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Ambient temperature limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Ingress protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

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Mechanical construction . . . . . . . . . . . . . . . . . . . . . . . 29
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Human interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Operating elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Ordering information. . . . . . . . . . . . . . . . . . . . . . . . . . .31
Product structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Certificates and approvals . . . . . . . . . . . . . . . . . . . . . .32
4 approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Ex approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Mounting kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Weather protection cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Active barrier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Fieldbus accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Measuring cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Software update and upgrade . . . . . . . . . . . . . . . . . . . . . . . . . .36

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General features
Modular design
Inside Liquiline (version with sensor module, without wiring) CPU and sensor module
Quick setup To the first measuring value within 1 minute
After setting up the few parameters in the Quick Setup menu, the measuring point is ready
to measure. Thefirst measured value is reliably displayed.
Navigator and plain text The unique operating concept sets new standards:
• Fewer user errors thanks to very easy operation
• Quick configuration with the Navigator.
• Intuitive configuration and diagnosis due to plain text display
Navigator Plain text display
Sensor monitor You can find the sensor monitor in the DIAG menu. Important sensor data, incl. warning
and alarm limits, aredisplayed either graphically or numerically.
Sensor monitor (example)
Process check system (PCS) This function checks the measuring signal for stagnation. If the measuring signal does not
change for some time(several measured values), an alarm is triggered. Soiling, blockage
or similar could be the cause of suchbehavior.

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Memosens The measuring point is safer with Memosens:
• No-contact, inductive signal transmission, thus optimum galvanic separation
• No galvanic corrosion
• Completely water-tight
• Automatic error message if data flow interrupted
• Sensor calibration possible in laboratory
• Predictive maintenance thanks to recording of sensor data, e.g.:
– Total hours of operation
– Hours of operation for very high or very low measuring values
– Hours of operation for high temperatures
– Number of steam sterilizations
– Consumption counter
Software packages You can choose from the following from these software packages:
• Basic:
Standard application for the most common measuring points
• Advanced:
Highest degree of accuracy (medium compensation) and safety (Cal-Timer) in critical
applications
Software
Software Features
packagepH/ORP ConductivityDissolvedoxygen
BasicAnalogsensorsAnalogsensorsDigitalsensors
–Offsetandtwo‐point–Samplecalibration–Slopecalibration
calibration–Temperaturecalibration:one‐
point
–inair(100%rH)
–Samplecalibration–Temperaturecompensation:
linear,
–inwater(100%air
–CalibrationwithstandardNaCl,Ultrapurewater(NaCl,HCl)saturated)
buffers–Simulationofcurrentoutput–inair(withinputofthe
–Manualbuffer–Self‐diagnosisabsoluteairpressureund
–Temperaturecompensation–Concentrationmeasurementoftherelativehumidity)
–Temperatureadjustment–Clock–Zeropointcalibration
–IsothermintersectionDigitalsensors–Samplecalibration
–Simulationofcurrentoutputfeatureslikeanalogsensorsplus:–Temperatureadjustment
–Self‐diagnosis–Sensorinformation–Simulationofcurrent
output
–Calibrationstabilitysettings –Self‐diagnosis
–Clock –Clock
Digitalsensors –Sensorinformation
featureslikeanalogsensorsplus: 
–Sensorinformation
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  Softwarepackage"Basic"andalso:
AdvancedAnalogsensorsAnalogsensorsDigitalsensors
–Mediumcompensation–Logbooks–Polarizationvoltagesetting
–Calibrationtimer–Datalogbook–Mediumcompensation
–Sensorstatistics–Calibrationwithseparate–Calibrationstabilitysettings
–Logbooksinstallationfactor–Calibrationtimer
–Datalogbook(inductivemeasurementonly)–Sensorstatistics
Digitalsensors–Polarizationdetection–Logbooks
featureslikeanalogsensorsplus:(conductivemeasurementonly)–Datalogbook
–Operatinghourscounter–Temperaturecompensationvia–Operatinghourscounter
–Sterilizationscounterusertable–Sterilizationscounter
 –Two‐pointtemperature
 adjustment:offsetandslope
 Digitalsensors
 featureslikeanalogsensorsplus:
 –Operatinghourscounter
 –Sterilizationscounter
 –USPalarmandpre‐alarm
  
Safety Code protection
The device offers two different user administration modes:
• Standard
– There are 3 fixed user roles (Operator, Maintenance, Expert).
– The expert can only change the maintenance password (factory setting: 0000). To do
so, the expert must
log onto the device with a fixed password (4685) that cannot be changed.
– No other users can be created.
• Advanced
– You can create and manage a maximum of 15 user accounts. You need to be logged on
as the expert to
do so.
– You can assign each user one of four user roles (View, Operator, Maintenance, Expert).
– Several "Experts" are possible.
– One user ("Administrator") is already created at the factory (password: 4685).
PCS: Live check
The live check issues an alarm when the sensor signal does not change over a defined
period of time. This maybe caused by blocking, passivation, separation from the process,
etc.
Reordering validated software
You can order new devices with older, validated software so you do not have to constantly
validate newsoftware versions of new devices. This is possible as long as allowed by the
hardware version.

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Special features
pH / ORP Suitable sensors
Connection of all types of pH and ORP sensors:
• Analog and digital glass electrodes
• Analog and digital ISFET sensors
• Analog and digital ORP sensors
• Pfaudler electrodes
• Analog single electrodes (glass or antimony)
Sensor Condition Check (SCC)
This function monitors the state of the electrodes or the degree of electrode ageing. The
"Electrode OK", "Lowwear" or "Replace electrode" messages inform you on the state of
the electrode. The electrode state is updatedafter each calibration. When the "Replace
electrode" message appears, an additional error message is triggered.
Sensor Check System (SCS)
The sensor check system alerts to deviations of the pH glass impedance or reference
impedance (analog sensorsonly) from the normal range, thus indicating possible failure
due to pH electrode blocking or damage. In addition, the SCS detects glass breakage of
glass electrodes and leakages of ISFET sensors.

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Conductivity Suitable sensors
Connection of all types of conductivity sensors:
• Analog and digital conductive sensors:
– Two-electrode sensors
– Four-electrode sensors
• Analog and digital inductive sensors
Polarization monitoring
Polarization effects in the boundary layer between the sensor and the solution to be
measured limit themeasuring range of conductive conductivity sensors. The transmitter
can detect and indicate polarization effects using an innovative, intelligent signal
evaluationprocess.
United States Pharmacopeia (USP) and European Pharmacopoeia (EP)
The requirements on ultrapure water in the pharmaceutical industry are specified by the
American USP andthe European EP.
The transmitter meets the USP/EP requirements on conductivity measuring systems:
• Precise temperature measurement at point of conductivity measurement
• Simultaneous display of uncompensated conductivity values and temperature possible
• Display resolution 0.01 μS/cm
• Exact adjustment of the transmitter in the factory with traceable precision resistances
(optional)
• Exact adjustment of the sensors in the factory in accordance with ASTM D 1125-9 resp.
ASTM D 5391-99(optional)
• Temperature-dependent measured value monitoring acc. to USP and EP.
The "Advanced" software package provides the limit value functions for pharmaceutical
waters acc. to USP andEP:
• Water for Injection (WFI) acc. to USP <645> and EP
• Highly purified water (HPW) acc. to EP
• Purified water (PW) acc. to EP
The uncompensated conductivity value and the temperature are measured with the USP
and EP limit valuefunctions. The measured values are compared with the tables described
in the standards. If a limit value isexceeded, an alarm is displayed. Additionally, a pre-
alarm can be defined to indicate undesired operation statesbefore they occur.
Oxygen Suitable sensors
Amperometric sensors:
• With Memosens technology
• 12 and 40 mm design
Application-optimized calibration models
The transmitter offers separate functions for zero-point calibration and slope calibration.
This allows foroptimum adaption to the process.
The calibration models range from simple slope calibration in vapour-saturated air to slope
calibration withindication of absolute air pressure and relative humidity at measuring
place. The latter model allows you to calibrate during operation as well as during
sterilization or cleaning. The transmitter has individual calibrations and sterilizations
counters for sensor and membrane cap. Thecounter for the membrane cap can be reset
after each cap replacement.

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Measuring system
pH/ORP(analogsensor)Conductivity,inductiveConductivity,conductiveMemosens(digitalsensor)
•OM42‐P/R...measurement(analog)measurement(analog)•OM42‐K/M/N/O...
•MeasuringcableOPK9•OM42‐I...•OM42‐C...•MeasuringcableOYK10
•AssemblyCleanfitOPA471•AssemblyDipfitOLA111•MeasuringcableOPK9•(AssemblyUnifitOPA442)
•SensorOrbisintOPS11•SensorIndumaxOLS50•SensorCondumaxOLS16•SensorOPS11D(pH:glass)/
OPS471D(pH:ISFET)/
OOS21D/51D(oxygen)/
OLS15D/16D/21D
(conductivity,cond.meas.)
Note!
You can select from a wide variety of assemblies and sensors to set up your measuring point. You can find the
corresponding information in the chapter "Accessories" resp. in the referenced documentations.

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Input
Binary input (Memosens): Measured variable
pH/ORP, Oxygen, • pH value
Conductivity • Oxidation-reduction potential
• Oxygen
• Conductivity (conductive sensors)
• Resistivity
• Temperature
Measuring range
pHvalue
–2to16(glasselectrodes)
0to14(ISFETsensors)
ORP–1500to+1500mV
Dissolvedoxygen
0.0to100.0mg/l
0to1000%SAT
0to2000hPa
Conductivity,conductively
measured0.1μS.k1))to20mS.k
Resistivity,conductively
measured10MΩ/kto50Ω/k
Concentration
NaOH:0to15%(0to100°C/32to212°F)
HNO3:0to25%(0to80°C/32to180°F)
H2SO4:0to30%(0to100°C/32to212°F)
H3PO4:0to15%(0to80°C/32to180°F)
HCl:0to20%(0to65°C/32to150°F)
4usertables
Temperature–25to+150°C(–10to300°F)
1) k = cell constant in cm-1Example: 2-electrode sensor, k=0.01 cm–1, resulting measuring
range: 0.001 to 200 μS/cm
Cable specification
WithMemosens
100m(330ft)max.
cablelength
Ex specification
1) OM42-*G*********, OM42-*X*********, OM42-*Z*********
2) OM42-*V*********
Intrinsicallysafesensorcircuitwithtypeofprotection:ExiaIIC1)
Powerlimitedsensorcircuitwithtypeofprotection:ExnLIIC2)
Max.outputvoltageUo5.04V
Max.outputcurrentIo80mA
Max.outputPo112mW
ForconnectiontothespecialmeasuringcableOYK10

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Analog input: pH / ORP
Measuring range
pHvalue–2to16
ORP–1500to+1500mV
Temperature–25to+150°C(–10to300°F)
Cable specification
WithoutSCS50m(160ft)max.cablelength
WithSCS20m(65ft)max.cablelength
Applicable temperature sensors
• Pt100
• Pt1000
• NTC 30K
Ex specification
Intrinsicallysafesensorcircuitwithtypeofprotection:ExiaIIC1)
Powerlimitedsensorcircuitwithtypeofprotection:ExnLIIC2)
 GlasselectrodeISFET
Max.outputvoltageUo10.08V10.08V
Max.outputcurrentIo4.1mA50.7mA
Max.outputPo10.2mW128mW
Max.externalinductanceLo1mH1mH
Max.externalcapacityCo250nF250nF
Connectionclassacc.toNE1163)SensISCO1X‐
1) OM42-*G*********, OM42-*X*********, OM42-*Z*********
2) OM42-*V*********
3) OM42-*G*********
Note!
When pH/ORP glass electrodes are connected to terminals 317, 318, 320, 111,
112 and 113, the device
corresponds to connection class 1 as per NAMUR Recommendation NE116
(SensISCO). Terminals 315 and
316 may not be connected for this categorization.
The device is labeled SensISOO1X.
Input impedance
> 1*1012 ∧ (at nominal operating conditions)
Input leakage current
< 1*10-13 A (at nominal operating condition

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Analog input: Conductivity Measured variable
• Conductivity
• Resistivity (conductive measurement only)
• Concentration
1
) k = cell constant in cm-1Example: 2-electrode sensor, k=0.01 cm–1, resulting measuring
range: 0.001 to 200 μS/cm
2) k=cell constant in cm–1 Example: sensor, k=2 cm–1, resulting measuring range: 3.4μS/cm
to 2 S/cm
Ex specification
1) With OYK71 or CPK9 cables or sensor fixed cable
2) With OLK5 cable or sensor fixed cable
Temperature sensor
• Pt100
• Pt1000
Ex specification, conductive sensors
Intrinsicallysafesensorcircuitwithtypeofprotection:ExiaIIC1)
Powerlimitedsensorcircuitwithtypeofprotection:ExnLIIC2)
Max.outputvoltageUo10.08V
Max.outputcurrentIo23mA
Max.outputPo57mW
Max.externalinductanceLo300μH
Max.externalcapacityCo50nF
1) OM42-*G*********, OM42-*X*********, OM42-*Z*********
2) OM42-*V*********
Conductivity,conductivelymeasured
Two‐electrodesensor0.1μS.k1))to20mS.k
Four‐electrodesensor0.1μS.kto1.5S.k
Conductivity,inductivelymeasured1.7μS.k2))to1S.k
Resistivity,conductivelymeasured10MΩ/kto50Ω/k
ConcentrationConcentrationNaOH:0to15%(0to100°C/32to212°F)
 HNO3:0to25%(0to80°C/32to180°F)
 H2SO4:0to30%(0to100°C/32to212°F)
 H3PO4:0to15%(0to80°C/32to180°F)
 HCl:0to20%(0to65°C/32to150°F)
 4usertables
Conductivity/resistivity,conductively
measured1))
Two‐electrodesensor
10μS.kto20mS.k/0.1MΩ/kto50Ω/k100m(330ft)max.cablelength
5μS.kto20mS.k/0.2MΩ/kto50Ω/k50m(160ft)max.cablelength
0.1μS.kto20mS.k/20MΩ/kto50Ω/k15m(50ft)max.cablelength
Conductivity,conductivelymeasured
Four‐electrodesensor
10μS.kto1.5S.k100m(330ft)max.cablelength
0.1μS.kto20mS.k15m(50ft)max.cablelength
Conductivity,inductivelymeasured2))55m(180ft)max.cablelength

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Ex specification, inductive sensors
Intrinsicallysafesensorcircuitwithtypeofprotection:ExiaIIC1)
Powerlimitedsensorcircuitwithtypeofprotection:ExnLIIC2)
Max. output voltage Uo 10.08 V
Max. output current Io 64 mA
Max. external Po 128 mW
1) OM42-*G*********, OM42-*X*********, OM42-*Z*********
2) OM42-*V*********
Output
Output signal 1x 4 to 20 mA, potentially isolated against sensor circuit1)
2x 4 to 20 mA, potentially isolated against sensor circuit2)
PROFIBUS PA3)
FOUNDATION Fieldbus4)
Signal on alarm 3.6 to 22.0 mA
digital via field bus5
Load Max. load with an supply voltage of 24 V: 500 ∧
Max. load with an supply voltage of 30 V: 750 ∧
Output signal range
Ex specification
current output 4/20 mA
1) current output 1, potential isolation with Memosens: in sensor plug
2) current output 1 and current output 2 (optional)
3) for version with PROFIBUS PA
4) for version with FOUNDATION Fieldbus
5) withProfibus PA or FOUNDATION Fieldbus only
pHadjustable,ΔpH>0.5
ORPadjustable,ΔU>5mV
Dissolvedoxygen adjustable
Conductivity,conductivemeasured adjustable
Conductivity,inductivemeasured adjustable
Temperature adjustable,ΔԂ>2°C(2°F)
Intrinsicallysafesupplyandsignalcircuits,passive
Max.inputvoltageUi 30V
Max.inputcurrentIi 100mA
Max.inputPi 750mW
Max.internalinductivityLi 29μH(output1)
 24μH(output2)
Max.internalcapacityCi 1.2nF(output1)
 0.2nF(output2)

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Ex specification PROFIBUS PA
and FOUNDATION Fieldbus
SuitableforuseasafielddeviceinaFISCOsystem
Max.inputvoltageUi17.5V
Max.inputcurrentIi380mA
Max.inputPi5.32W
Max.internalinductivityLi<10μH
Max.internalcapacityCi<5nF
Wiring
Housing grounding Plastic housing
Caution!
You must connect the "Fixing plate" to the foundation ground with a separate functional
ground line (ε2.5 mm2i14 AWG).
Stainless steel housing
Housing grounding 1Fixing plate
2.ε2.5 mm2 (i14 AWG) functional ground
Caution!
You must connect the outer ground connection of the housing to the foundation ground
with a separate line(GN/YE) (ε2.5 mm2 i14 AWG).
Housing grounding
1Outer ground connection
2.ε2.5 mm2 (i14 AWG) line (GN/YE)

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Supply and signal circuit 4 ... 20 mA
Note!
Connect the transmitter via a two-wire cable.
The second current output is an option (see "Ordering information").
View in device (CPU module) Wiring diagram
4 ... 20 mA / Hart®
Note!
For safe communication via the HART protocol and for compliance with the
NAMUR NE 21, use a two-wire cable shielded on each end.
View in device (CPU module) Wiring diagram
PROFIBUS PA and FOUNDATION Fieldbus
Note!
Always use a fieldbus cable that is grounded on both sides (device and PCS).
You can connect Profibus and FOUNDATION Fieldbus devices in various ways:
1. Shielded two-wire cable, "Hard grounding"(generally to be preferred to
capacitive grounding)
2. Shielded two-wire cable, "Capacitive grounding" (shield grounded in device via
a capacitor, accessory"C module" necessary)
Use it, if there is a risk of high equalizing currents. Not applicable for
Exversions!
3. Using the fieldbus connection socket (accessories)

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"Hard grounding"
• Place the cable shield on the "Fixing plate".
• Connect the cable wires as per the assignment
View in device (CPU module) Wiring diagram
"Capacitive grounding"
• Strip back the shield braiding, push the extension wire of the C module (pos. 1)
onto the exposed shield andfasten the clip:
• Place the extension wire on the "Fixing plate".
• Connect the cable wires as per the assignment.
View in device (CPU module) Wiring diagram

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"Fieldbus connection socket"
• Screw the fieldbus connection socket (accessories) into the housing bushing.
• Trim the connection cores of the socket to approx. 15 cm (5.9 ").
• Connect the cable cores as per the assignment. In doing so, you must place the
cable shield (GN/YE) on the"Fixing plate".
View in device (CPU module) Wiring diagram
Cable specification
Max. cable cross-section: 2.5 mm2 (i14 AWG), GND 4 mm2 (i12 AWG)
Supply voltage
Minimum supply voltage at transmitter to output current
A with HART communication
B without HART communication
PROFIBUS/FOUNDATIONFieldbus:
9to32VDC(non‐hazardouslocation)
9to17.5VDC(hazardouslocation)
Powerconsumptionofthefieldbus 22mA

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Sensor connection Explanation of abbreviations in the following diagrams:
Abbreviation Meaning
pHSignalfrompHmembraneglass
RefSignalfromreferenceelectrode
SrcSource
DrnDrain
PMPotentialmatching
U+Digitalsensorsupply
U–
ComADigitalsensorcommunication
ComB
ԂTemperaturesignal
d.n.c.DonotConnect!
Note!
• Cable colors indicated as per IEC 757 (see CD-ROM).
• You must connect shielded connections and terminals with functional earth ())
(there is no protective earth(*) for plastic housings).
• Since inductive conductivity sensors work with magnetic fields, avoid any
magnetic interferences.
Sensor connection:
digital sensors (Memosens)
pH/ORP/ISFET/Oxygen/
Conductivity
View in device Wiring diagram
Sensor connection: Glass electrodes with PML (symmetrical)

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analog pH / ORP sensors
View in device Wiring diagram
Glass electrodes without PML (asymmetrical)
View in device Wiring diagram
ISFET sensors with PML (symmetrical)

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View in device Wiring diagram
ISFET sensors without PML (asymmetrical)
View in device Wiring diagram
Pfaudler electrodes With PM (symmetrical) With PM (symmetrical)