
Specs at a glance
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Input
One channel transmitter for Memosens and analog (pH, ORP, conductivity)
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Output / communication
1/2 x 4 to 20 mA, HART, Profibus, FF
Additional second output possible, also later -
Ingress protection
IP66/67, NEMA 4X
Field of application
Liquiline M CM42 is the robust transmitter for pH/ORP, conductivity or oxygen measurement in all process applications. It is the best choice for demanding environments be it hygienic applications, hazardous areas or functional safety areas. Liquiline’s intuitive operating concept simplifies commissioning, handling, and maintenance saving you time every day. Easy switching of parameters and seamless system integration give you the flexibility to adapt it exactly to your measuring task.
The Liquiline CM42 transmitter is suitable for all process applications, for example in these industries and their utilities:
Chemicals
Food & Beverages
Life Sciences
Power & Energy
Oil & Gas
Primaries & Metal
Liquiline CM42 features the following protocols and interfaces:
0/4...20 mA
HART
PROFIBUS PA
FOUNDATION Fieldbus
With its international explosion protection approvals, such as IECEx, ATEX, FM, CSA, TIIS and NEPSI, the transmitter is suitable for hazardous area use.
Benefits
Simple commissioning with quick setup and navigator
The Memosens technology allows plug & play with pre-calibrated Memosens sensors
Less storage thanks to modular design
Predictive maintenance system detects when a sensor has to be cleaned, calibrated or replaced
Videos
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Memosens converts the measured value to a digital signal and transfers it to the transmitter without a contacting connection. This video shows how Memosens optimizes process control and maintenance.
Extended selection
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High-end products
- Highly functional and convenient
Technical excellence
Simplicity

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Standard products
- Reliable, robust and low-maintenance
Technical excellence
Simplicity
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Specialized products
- Designed for demanding applications
Technical excellence
Simplicity
Variable
FLEX selections | Technical excellence | Simplicity |
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Fundamental selection Meet your basic measurement needs |
Technical excellence
|
Simplicity
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Lean selection Handle your core processes easily |
Technical excellence
|
Simplicity
|
Extended selection Optimize your processes with innovative technologies |
Technical excellence
|
Simplicity
|
Xpert selection Master your most challenging applications |
Technical excellence
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Simplicity
Variable |
Predecessor
Success stories
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Measuring principle
ISFET
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Application
Chemical processes, pharmaceuticals industry, foodstuff technology, applications in hazardous areas
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Characteristic
Liquiline M CM42 is a modular two-wire transmitter for all areas of process engineering
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Measuring principle
Potentiometric pH measurement
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Design
Depending on the ordered version, Liquiline M CM42 has one or two analog current outputs or it can be connected to field busses as per FOUNDATION Fieldbus, PROFIBUS PA and HART protocol
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Material
Plastic or stainless steel housing with EPDM sealings
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Dimension
Plastic housing:
144 x 144 x 148 mm
5.67 x 5.67 x 5.83 inch
Stainless Steel:
174 x 174 x 134 mm
6.85 x 6.85 x 5.28 inch -
Temperature sensor
Applicable:
Pt100, Pt1000, NTC 30K -
Ex certification
: ATEX, IECEx, FM, CSA, NEPSI, EAC, UKEx, JPN Ex
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Ingress protection
IP66/67, NEMA 4X
-
Input
One channel transmitter for Memosens and analog (pH, ORP, conductivity)
-
Output / communication
1/2 x 4 to 20 mA, HART, Profibus PA, FF
Additional second output possible, also later
-
Measuring principle
Sensor ORP / Redox
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Application
Chemical processes, pharmaceuticals industry, foodstuff technology, applications in hazardous areas
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Characteristic
Liquiline M CM42 is a modular two-wire transmitter for all areas of process engineering
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Measuring principle
ORP measurement
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Design
Depending on the ordered version, Liquiline M CM42 has one or two analog current outputs or it can be connected to field busses as per FOUNDATION Fieldbus, PROFIBUS PA and HART protocol
-
Material
Plastic or stainless steel housing with EPDM sealings
-
Dimension
Plastic housing:
144 x 144 x 148 mm
5.67 x 5.67 x 5.83 inch
Stainless Steel:
174 x 174 x 134 mm
6.85 x 6.85 x 5.28 inch -
Temperature sensor
Applicable:
Pt100, Pt1000, NTC 30K -
Ex certification
ATEX, IECEx, FM, CSA, NEPSI, EAC, UKEx, JPN Ex
-
Ingress protection
IP66/67, NEMA 4X
-
Input
One channel transmitter for Memosens and analog (pH, ORP, conductivity)
-
Output / communication
1/2 x 4 to 20 mA, HART, Profibus, FF
Additional second output possible, also later
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Measuring principle
Conductive
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Application
Chemical processes, pharmaceuticals industry, foodstuff technology, applications in hazardous areas
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Characteristic
Liquiline M CM42 is a modular two-wire transmitter for all areas of process engineering
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Measuring principle
Resistance measurement
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Design
Depending on the ordered version, Liquiline M CM42 has one or two analog current outputs or it can be connected to field busses as per FOUNDATION Fieldbus, PROFIBUS PA and HART protocol
-
Material
Plastic or stainless steel housing with EPDM sealings
-
Dimension
Plastic housing:
144 x 144 x 148 mm
5.67 x 5.67 x 5.83 inch
Stainless Steel:
174 x 174 x 134 mm
6.85 x 6.85 x 5.28 inch -
Temperature sensor
Applicable:
Pt100, Pt1000 -
Ex certification
ATEX, IECEx, FM, CSA, NEPSI, EAC, UKEx, JPN Ex
-
Ingress protection
IP66/67, NEMA 4X
-
Input
One channel transmitter for Memosens and analog (pH, ORP, conductivity)
-
Output / communication
1/2 x 4 to 20 mA, HART, Profibus PA, FF
Additional second output possible, also later
-
Measuring principle
Amperometric oxygen measurement
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Application
Chemical processes, pharmaceuticals industry, foodstuff technology, applications in hazardous areas
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Characteristic
Liquiline M CM42 is a modular two-wire transmitter for all areas of process engineering
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Measuring principle
Connection of oxygen sensors with Memosens coupling
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Design
Depending on the ordered version, Liquiline M CM42 has one or two analog current outputs or it can be connected to field busses as per FOUNDATION Fieldbus, PROFIBUS PA and HART protocol
-
Material
Plastic or stainless steel housing with EPDM sealings
-
Dimension
Plastic housing:
144 x 144 x 148 mm
5.67 x 5.67 x 5.83 inch
Stainless Steel:
174 x 174 x 134 mm
6.85 x 6.85 x 5.28 inch -
Ex certification
ATEX, IECEx, FM, CSA, NEPSI, EAC, UKEx, JPN Ex
-
Ingress protection
IP66/67, NEMA4X
-
Input
One channel transmitter for Memosens and analog (pH, ORP, conductivity)
-
Output / communication
1/2 x 4 to 20 mA, HART, Profibus PA, FF
Additional second output possible, also later
-
-
Technical Information (TI)
Liquiline M CM42
English version - 10/2020
New version available in English
Two-wire transmitter for hazardous and non-hazardous areas
EN 15/10/202025/06/201425/06/201301/01/201101/12/2008Language:
English
Version:
15/10/2020
File size:
4.5 MB
File name:
TI00381CEN_1620.pdf
-
-
-
Short Instruction (KA)
Liquiline CM42
English version - 05/2021
New version available in English
Two-wire transmitter for pH/ORP, conductivity or oxygen
EN 31/05/2021Language:
English
Version:
31/05/2021
File size:
3.6 MB
File name:
KA01481CEN_0121.pdf
-
-
-
Technical Information (TI)
Liquiline M CM42
-
Technical Information (TI)
English version - 10/2020Two-wire transmitter for hazardous and non-hazardous areas
EN 15/10/202025/06/201425/06/201301/01/201101/12/2008Language:
English
Version:
15/10/2020
File size:
4.5 MB
File name:
TI00381CEN_1620.pdf
-
-
-
Short Instruction (KA)
Liquiline CM42
-
Short Instruction (KA)
English version - 05/2021Two-wire transmitter for pH/ORP, conductivity or oxygen
EN 31/05/2021Language:
English
Version:
31/05/2021
File size:
3.6 MB
File name:
KA01481CEN_0121.pdf
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-
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Ex Safety Instruction (XA)
Liquiline M CM42
-
Ex Safety Instruction (XA)
English version - 01/2021Supplement to:
BA00381C and BA00382C
Safety instructions for electrical apparatus in explosion-hazardous
areas
EN 01/01/202130/04/2016Language:
English
Version:
01/01/2021
File size:
786 KB
File name:
XA01504CEN_0221.pdf
-
-
-
Ex Safety Instruction (XA)
Liquiline M CM42
-
Ex Safety Instruction (XA)
English version - 10/2021Supplement to: BA00381C
Safety instructions for electrical apparatus in explosion-hazardous
areas
UK Ex II (1)2G Ex ib[ia Ga] IICT6/T4 GbLanguage:
English
Version:
29/10/2021
File size:
939.2 KB
File name:
XA02725CEN_0121.pdf
-
-
-
Ex Safety Instruction (XA)
XA Liquiline M CM42
-
Ex Safety Instruction (XA)
English version - 12/2023Two-wire transmitter for hazardous areas
KOR Ex ib [ia Ga] IIC T6/T4 GbEN 08/12/202311/07/2023Language:
English
Version:
08/12/2023
File size:
422.5 KB
File name:
XA03133CEN_0223-00.pdf
-
-
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Ex Safety Instruction (XA)
Liquiline M CM42
-
Ex Safety Instruction (XA)
English version - 06/2022NEPSI Ex ib [ia Ga] IIC T4/T6 Gb
Safety instructions for electrical apparatus in explosion-hazardous
areasEN 13/06/2022Language:
English
Version:
13/06/2022
File size:
534.9 KB
File name:
XA02858CEN_0122-00.pdf
-
-
-
Ex Safety Instruction (XA)
XA Liquiline M CM42
-
Ex Safety Instruction (XA)
English version - 05/2025Two-wire transmitter for hazardous areas
ATEX II 3G Ex ec [ic Gc] IIC T6 Gc
NEPSI Ex ec [ic Gc] IIC T6 GcEN 27/05/2025Language:
English
Version:
27/05/2025
File size:
536.3 KB
File name:
XA03517CEN_0125-00.pdf
-
-
-
Ex Safety Instruction (XA)
Liquiline M CM42
-
Ex Safety Instruction (XA)
English version - 03/2023Two-wire transmitter for hazardous areas
JPN Ex ib [ia Ga] IIC T6 GbEN 29/03/2023Language:
English
Version:
29/03/2023
File size:
420.9 KB
File name:
XA03099CEN_0123-00.pdf
-
-
-
Ex Safety Instruction (XA)
XA Liquiline M CM42
-
Ex Safety Instruction (XA)
English version - 10/2024Two-wire transmitter for hazardous areas
INMETRO Ex ib [ia Ga] IIC T6/T4 GbEN 31/10/2024Language:
English
Version:
31/10/2024
File size:
440.4 KB
File name:
XA03395CEN_0124-00.pdf
-
-
-
Ex Safety Instruction (XA)
XA Liquiline CM42
-
Ex Safety Instruction (XA)
English version - 12/2023Two-wire transmitter for hazardous areas
FM IS NI Cl.I Div.1&2, Groups A-D
CSA IS NI Cl.I,II,III Div.1&2, Groups A-GEN 14/12/202329/11/202101/07/202131/07/202028/02/2019Language:
English
Version:
14/12/2023
File size:
1.2 MB
File name:
XA01687CEN_0623-00.pdf
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