Endress+Hauser Liquiline M CM42 Manual

TI381C/07/en/10.06
51517610
Technical Information
Liquiline M CM42
Two-wire transmitter for Ex and non-Ex areas
Analog sensors: pH/ORP/conductivity/concentration/resistivity
Digital sensors: pH/ORP/oxygen
1
Application
Liquiline M CM42 is a modular two-wire transmitter for all
areas of process engineering.
Depending on the ordered version, Liquiline has one or two
analog current outputs or it can be connected to field buses as
per FOUNDATION Fieldbus, PROFIBUS PA and Hart protocol.
Liquiline is developed acc. to the international safety standard
IEC 61508.
The extremely robust, corrosion-resistant plastic version and
the hygienic stainless steel version are designed for the
following applications:
• Chemical processes
• Pharmaceuticals industry
• Foodstuff technology
• Applications in hazardous locations
Your benefits
•Cost-saving:
– Simple commissioning with Quick Setup and Navigator
(multifunction button)
– Thanks to Memosens technology, a calibration in the plant
is not required
– Predictive maintenance system detects when a sensor has
to be cleaned, calibrated or replaced
– Less storage thanks to modular design
•Safe:
– Active display of cable interruption with Memosens
version
– Red alarm LED reports error immediately
– User-guided commissioning, graphic display and plain text
guidance
– ATEX, FM, CSA, NEPSI
– Code-protected commissioning and calibration
• Industry solutions:
– Modular concept: sensor module replaceable
– Asset management (Fieldcare, W@M)

2
Table of contents
General features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Modular design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Quick setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Navigator and plain text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Sensor monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Process check system (PCS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Memosens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Software packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Special features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
pH / ORP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Oxygen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Measuring system . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
pH / ORP (analog sensors) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Conductivity (analog sensors) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
pH/ORP (digital sensors) Oxygen (digital sensors) . . . . . . . . . . . . . 9
Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Output signal range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Ex specification current output 4/20 mA . . . . . . . . . . . . . . . . . . 10
Ex specification PROFIBUS PA and FOUNDATION Fieldbus . . . . 11
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Housing grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Supply and signal circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Sensor connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Sensor connection: pH / ORP . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Sensor connection: conductivity . . . . . . . . . . . . . . . . . . . . . . . . . 18
Sensor connection: pH/ORP/ISFET/oxygen (digital sensors) . . . . 19
Performance characteristics. . . . . . . . . . . . . . . . . . . . 20
pH / ORP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
pH/ORP/oxygen (digital sensors) . . . . . . . . . . . . . . . . . . . . . . . . 21
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Mounting plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Weather protection cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Mounting options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Installation in Ex area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Ambient temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Ambient temperature limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Ingress protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Mechanical construction . . . . . . . . . . . . . . . . . . . . . . 25
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Human interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Operating elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Certificates and approvals . . . . . . . . . . . . . . . . . . . . . 26
4approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Ex approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Ordering information. . . . . . . . . . . . . . . . . . . . . . . . . 27
Product structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Mounting kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Weather protection cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Active barrier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Fieldbus accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Measuring cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Operating Instructions CM42 . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

3
General features
Modular design
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. The
first 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
Sensor monitor Pressing the DIAG key takes you to the sensor monitor. All the important sensor data, incl. warning and alarm
limits, are graphically displayed in one go.
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 such
behaviour.
a0001296
Inside Liquiline (version with sensor module, without wiring)
a0004956
CPU and sensor module
a0001984
Navigator
a0001985-en
Plain text display
a0001771-en
Sensor monitor (example)

4
Memosens The measuring point is safer with Memosens:
• No-contact, inductive signal transmission, thus optimum galvanic separation
• No contact corrosion
• Completely water-tight
• Automatic error message if data flow interrupted
• Sensor calibration possible in laboratory
• Look-ahead maintenance thanks to recording of sensor data, e.g.:
– Total hours of operation
– Hours of operation for very high or very low pH values
– Hours of operation for high temperatures above 80 °C (176 °F) and 100 °C (212 °F)
– Number of steam sterilisations
Software packages You can select the software functionality to suit your needs. Consequently, you can avoid a "software overload"
while still having all the required features.
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
• Advanced Plus:
In addition to the Advanced package, the requirements of the FDA are taken into consideration
Software
package
Features
pH /ORP Conductivity Dissolved oxygen
Basic Analog sensors
– Offset and two-point
calibration
– Sample calibration
– Calibration with standard
buffers
– Manual buffer
– Temperature compensation
– Temperature adjustment
– Isotherm intersection
– Simulation of current output
–Self-diagnosis
–Clock
Digital sensors
features like analog sensors plus:
– Sensor information
Analog sensors
– Sample calibration
– Temperature calibration: one-point
– Temperature compensation: linear,
NaCl, Ultrapure water (NaCl, HCl)
– Simulation of current output
–Self-diagnosis
– Concentration measurement
–Clock
Digital sensors
– Slope calibration
– in air (100% rH)
– in water (100% air
saturated)
– in air (with input of the
absolute air pressure und
of the relative humidity)
– Zero point calibration
– Sample calibration
– Temperature adjustment
– Simulation of current output
–Self-diagnosis
–Clock
– Sensor information
Advanced
Software package "Basic" and also:
Analog sensors
– Medium compensation
– Calibration stability settings
– Calibration timer
– Sensor statistics
– Logbooks
– Data logger
Digital sensors
features like analog sensors plus:
– Operating hours counter
– Sterilizations counter
Analog sensors
– Logbooks
– Data logger
– Calibration with separate
installation factor
(inductive measurement only)
– Polarization detection
(conductive measurement only)
– Temperature compensation via
user table
– Two-point temperature
adjustment: offset and slope
– Free assignment of current
outputs: main value and
temperature
Digital sensors
– Polarization voltage setting
– Medium compensation
– Calibration stability settings
– Calibration timer
– Sensor statistics
– Logbooks
– Data logger
– Operating hours counter
– Sterilizations counter
Advanced
Plus
Software package "Advanced" and also:
– 21CFR11
–Audittrail
– 21CFR11
– USP alarm and pre-alarm (United
States Pharmacopeia),
EP (European Pharmacopoeia)
–Audittrail
– 21CFR11
–Audittrail

5
Safety Safety integration level acc. to IEC 61508 (SIL 2)
Liquiline is the first analysis transmitter to be developed to IEC 61508.
The development to SIL 2 reduces the probability of hidden errors and stands for the highest degree of
reliability.
Alarm LED
A bright, red LED draws your attention to an error (21.5 mA alarm).
Code protection
You can specify passwords linked to relevant access rights for various user groups:
• Specialist
• Maintenance
To guarantee the highest degree of safety and security in the pharmaceuticals sector, you can specify user roles
with IDs and passwords as per 21CFR11.
Reordering validated software
You can order new devices with older, validated software so you do not have to constantly validate new
software versions of new devices. This is possible as long as allowed by the hardware version.
Special features
pH / ORP Suitable sensors
Connection of all types of pH sensors:
• Analog and digital glass electrodes
• Analog and digital ISFET sensors
• Pfaudler electrodes
Sensor Condition Check (SCC)
This function monitors the state of the electrodes or the degree of electrode ageing. The "Electrode OK", "Low
wear" or "Replace electrode" messages inform you on the state of the electrode. The electrode state is updated
after 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 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.

6
Conductivity Polarization monitoring
Polarization effects in the boundary layer between the sensor and the solution to be measured limit the
measuring range of conductive conductivity sensors.
The transmitter can detect and indicate polarization effects using an innovative, intelligent signal evaluation
process.
United States Pharmacopeia (USP) and European Pharmacopoeia (EP)
The requirements on ultrapure water in the pharmaceutical industry are specified by the American USP and
the 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 Plus" software package provides the limit value functions for pharmaceutical waters acc. to USP
and EP:
• 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 value
functions. The measured values are compared with the tables described in the standards. If a limit value is
exceeded, an alarm is displayed. Additionally, a pre-alarm can be defined to indicate undesired operation states
before they occur.
Oxygen Suitable sensors
Amperometric sensors:
• with Memosens technology
• 12 and 40 mm design
Aplication-optimized calibration models
The transmitter offers separate functions for zero-point calibration and slope calibration. This allows for
optimum adaption to the process.
The calibration models range from simple slope calibration in vapour-saturated air to slope calibration with
indication 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. The
counter for the membrane cap can be reset after each cap replacement.

7
Measuring system
!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.
a0002012
Measuring system: Examples
pH / ORP
•CM42-P/R...
• Measuring cable CPK9
• Assembly Cleanfit CPA471
• Sensor Orbisint CPS11
Conductivity, inductive
measurement
• CM42-I...
• Assembly Dipfit CLA111
•SensorIndumaxCLS50
Conductivity, conductive
measurement
• CM42-C...
• Measuring cable CPK9
•SensorCondumaxCLS16
Digital sensor
• CM42-M/N/O...
•MeasuringcableCYK10
• Assembly Unifit CPA442
• Sensor CPS11D (pH: glass)/
CPS471D (pH: ISFET)/
COS21D (oxygen)

8
Input
pH / ORP (analog sensors) Measured variable
• pH value
• Oxidation-reduction potential (ORP)
•Temperature
Measuring range
Cable specification
Applicable temperature sensors
• Pt100
• Pt1000
•NTC30K
Ex specification
Conductivity (analog sensors) Measured variable
• Conductivity
• Resistivity (conductive measurement only)
• Concentration
Measuring range
pH value –2 to 16
ORP –1500 to +1500 mV
Temperature –25 to + 150 °C (–10 to 300 °F)
Without SCS 50 m (160 ft) max. cable length
With SCS 20 m (65 ft) max. cable length
Intrinsically safe sensor circuit with type of protection: EEx ia IIC
Max. output voltage Uo
Max. output current Io
Max. output Po
Max. external inductance Lo
Max. external capacity Co
Glass electrode
10.08 V
4.1 mA
10.2 mW
200 μH
150 nF
ISFET
10.08 V
50.7 mA
128 mW
200 μH
150 nF
Conductivity, conductive measured
Two-electrode sensor
Four-electrode sensor
0.1 μS.k1)) to 20 mS.k
0.1 μS.k to 1.5 S.k
1) k = cell constant in cm-1
Example: 2-electrode sensor, k=0.01 cm–1, resulting measuring range: 0.001 to 200 μS/cm
Conductivity, inductive measured 1.7 μS.k2)) to 1 S.k
2) k=cell constant in cm–1 Example: sensor, k=2 cm–1, resulting measuring range: 3.4 μS/cm to 2 S/cm
Resistivity, conductive 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

9
Cable specification
Temperature sensor
• Pt100
• Pt1000
Ex specification, conductive sensors
Ex specification, inductive sensors
pH/ORP (digital sensors)
Oxygen (digital sensors)
Measured variable
• pH value
• Oxidation-reduction potential
• Oxygen
•Temperature
Measuring range
Conductivity/resistivity, conductive
measured1))
Two-electrode sensor
10 μS.k to 20 mS.k / 0.1 MΩ/k to 50 Ω/k
5 μS.k to 20 mS.k / 0.2 MΩ/k to 50 Ω/k
0.1 μS.k to 20 mS.k / 20 MΩ/k to 50 Ω/k
1) with CYK71 or CPK9 cables or sensor fixed cable
100 m (330 ft) max. cable length
50 m (160 ft) max. cable length
15 m (50 ft) max. cable length
Conductivity, conductive measured
Four-electrode sensor
10 μS.k to 1.5 S.k
0.1 μS.k to 20 mS.k
100 m (330 ft) max. cable length
15 m (50 ft) max. cable length
Conductivity, inductive measured2))
2) with CLK5 cable or sensor fixed cable
55 m (180 ft) max. cable length
Intrinsically safe sensor circuit with type of protection: EEx ia IIC T6
Max. output voltage Uo
Max. output current Io
Max. output Po
Max. external inductance Lo
Max. external capacity Co
10.08 V
23 mA
57 mW
330 μH
50 nF
Intrinsically safe sensor circuit with type of protection: EEx ia IIC
Max. output voltage Uo
Max. output current Io
Max. external Po
10.08 V
64 mA
128 mW
For connection of the inductive sensors CLS50, CLS54
pH value –2 to 16 (glass electrodes)
0 to 14 (ISFET sensors)
ORP –1500 to +1500 mV
Oxygen 0.0 to 100.0 mg/l
0 to 1000 %SAT
0 to 2000 hPa
Temperature –25 to + 150 °C (–10 to 300 °F)

10
Cable specification
Ex specification
Output
Output signal 1x 4 to 20 mA, potentially isolated against sensor circuit1)
2x 4 to 20 mA, potentially isolated against sensor circuit2)
0.8 to 1.2 mA peak to peak3)
PROFIBUS PA4)
FOUNDATION Fieldbus5)
Signal on alarm ≥21.5 mA
digital via field bus6)
Load Max. load with an supply voltage of 24 V: 500 Ω
Max. load with an supply voltage of 30 V: 750 Ω
Output signal range
Ex specification
current output 4/20 mA
With Memosens 100 m (330 ft) max. cable length
Intrinsically safe sensor circuit with type of protection: EEx ia IIC T6
Max. output voltage Uo
Max. output current Io
Max. output Po
5.04 V
80 mA
112 mW
For connection to the special measuring cable CYK10
1) current output 1
2) current output 1 and current output 2 (optional)
3) only for HART communication
4) for version with PROFIBUS PA
5) for version with FOUNDATION Fieldbus
6) with Profibus PA or FOUNDATION Fieldbus only
pH adjustable, ΔpH > 0.5
ORP adjustable, ΔU > 5 mV
Oxygen adjustable
Conductivity, conductive measured none
Conductivity, inductive measured none
Temperature adjustable, minimum 2 °C (2 °F)
Intrinsically safe supply and signal circuit with type of protection:
EEx ia IIC T6 passive
Max. input voltage Ui
Max. input current Ii
Max. input Pi
Max. internal inductivity Li
Max. internal capacity Ci
30 V
100 mA
750 mW
221 μH (output 1)
24 μH (output 2)
1.2 nF (output 1)
negligible (output 2)

11
Ex specification PROFIBUS PA
and FOUNDATION Fieldbus
Wiring
Housing grounding Plastic housing
"Caution!
You must connect the "Fixing plate" to the foundation ground with a separate functional ground line (≥2.5 mm2
i14 AWG).
Stainless steel housing
"Caution!
You must connect the outer ground connection of the housing to the foundation ground with a separate line
(GN/YE) (≥2.5 mm2i14 AWG).
Suitable for use in a FISCO system
Max. input voltage Ui
Max. input current Ii
Max. input Pi
Max. internal inductivity Li
Max. internal capacity Ci
17.5 V
380 mA
5.32 W
negligible
negligible
a0003617
Housing grounding
1
2
Fixing plate
≥2.5 mm2(i14 AWG) functional ground
a0003616
Housing grounding
1
2
Outer ground connection
≥2.5 mm2(i14 AWG) line (GN/YE)

12
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").
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.
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 three 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.
3. Using the fieldbus connection socket (accessories)
a0005037
View in device (CPU module)
a0005038
Wiring diagram
+
–
133
134
4 ... 20 mA
+
–
233
234
4 ... 20 mA
Out 1
Out 2
a0002365
View in device (CPU module)
a0003100
Wiring diagram

13
Version 1: "Hard grounding"
• Place the cable shield on the "Fixing plate".
• Connect the cable wires as per the assignment.
Version 2: "Capacitive grounding"
• Strip back the shield braiding, push the extension wire of the C module (pos. 1) onto the exposed shield and
fasten the clip:
• Place the extension wire on the "Fixing plate".
• Connect the cable wires as per the assignment.
Version 3: Fieldbus connection socket (accessories):
• 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".
a0004060
View in device (CPU module)
a0001640
Wiring diagram
a0004071
View in device (CPU module)
a0004073
Wiring diagram

14
Cable specification
Max. cable cross-section: 2.5 mm2(i14 AWG), GND 4 mm2(i12 AWG)
Supply voltage
Sensor connection Explanation of abbreviations in the following diagrams:
!Note!
• Cable colours 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.
a0002378
View in device (CPU module)
a0004062
Wiring diagram
Current output 4 to 20 mA without Hart®:
Current output 4 to 20 mA with Hart®:
PROFIBUS / FOUNDATION Fieldbus:
(max.22mA)
12.5 to 30 V DC
12.5 to 30 V DC1))
9 to 32 V DC (non-hazardous location) /
9 to 17.5 V DC (hazardous location)
1) Permissible residual ripple acc. to IEC 60381-1:1985 3.3: <100 mVpp in the frequency range of
50 Hz to 3 kHz
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
ϑTemperature signal
d.n.c. Do not connect!

15
Sensor connection: pH / ORP Glass electrodes with PML (symmetrical)
Glass electrodes without PML (asymmetrical)
a0001088
View in device
a0001079
Wiring diagram
a0001089
View in device
a0001080
Wiring diagram
BK
BN
GN
WH
YE
CPK9
318
320
112
113
111
317
CM42
319
316
315
J
PM
Ref
pH
Sensor
CPK1
BK
BN
GN
WH
YE
318
320
112
113
111
317
CM42
319
315
316
CPK9 / CPK1
J
d.n.c.
Ref
pH
Sensor
pH
CPK1

16
ISFET sensors with PML (symmetrical)
ISFET sensors without PML (asymmetrical)
a0001090
View in device
a0001076
Wiring diagram
a0001084
View in device
a0001077
Wiring diagram
BK
BN
GN
WH
YE
CPK12
317
318
112
113
111
319
CM42
315
316
320
RD
Src
J
Ref
PM
Drn
Sensor
BK
BN
GN
WH
YE
317
318
112
113
111
319
CM42
315
316
320
RD
Src
Ref
Drn
J
d.n.c.
CPK12 Sensor

17
Pfaudler electrode, absolute
type 03 / type 04
Pfaudler electrode, relative
type 18 / type 40 / Reiner type
a0006051
Wiring diagram
a0006052
Wiring diagram

18
Sensor connection:
conductivity
Conductive sensors, two-electrode sensors
Conductive sensors, four-electrode sensors
a0001086
View in device
a0001083
Wiring diagram
a0002363
View in device (sensor module)
a0002371
Wiring diagram
BK
BN
GN
WH
YE
CPK9 / CYK71
221
222
112
113
111
CM42
220
219
J
Sensor
d.n.c.
221
222
112
113
111
CM42
220
219
J
Sensor

19
Inductive sensors
Sensor connection:
pH/ORP/ISFET/oxygen
(digital sensors)
a0001085
View in device
a0001082
Wiring diagram
a0001087
View in device
a0001078
Wiring diagram

20
Performance characteristics
pH / ORP Reference temperature
25 °C (77 °F)
Measured value resolution
Maximum measured error7)
Repeatability
Conductivity Reference temperature
25 °C (77 °F)
adjustable from –5 to 100 °C (23 to 212 °F)8)
Measured value resolution
pH (glass electrodes and ISFET sensors) 0.01 pH
ORP: 1 mV
Temperature: 0.1 °C (0.1 °F)
SCS glass electrodes:
Glass:
Reference:
100 kΩ
100 Ω
Leak current, ISFET sensors: 100 nA
7) acc. to DIN IEC 746 part 1, under nominal operating conditions
pH (glass electrodes and ISFET sensors) 0.02 pH
ORP: 1 mV
Temperature:
NTC30k:
Pt100 / Pt1000:
0.5 K
0.25 K
SCS glass electrodes:
Glass:
Reference:
200 MΩ
200 Ω
Leak current, ISFET sensors: 100 nA
pH < 0.01
8) with software package "Advanced" or "Advanced Plus"
Conductivity < 0.1% from the measured value (4 digits)
minimum, at:
cell constant k ≤0.15 cm-1
cell constant k ≤1.5 cm-1
cell constant k > 1.5 cm-1
0.001 μS/cm
0.01 μS/cm
0.1 μS/cm
Temperature (Pt100 / Pt1000) 0.01 °C (0.01 °F)
Resistivity
minimum
< 0.1% from the measured value (4 digits)
1 kΩ.cm