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Liquiline CM442R is a state-of-the-art transmitter for pH, ORP, conductivity, oxygen, chlorine, turbidity, sludge level, SAC, nitrate and many other parameters.

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An optional display enables configuration, maintenance and operation of the measuring point on-site.

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Liquiline transmitters with Heartbeat Technology offer status-oriented maintenance and easy verification of the measuring point and help you to carry out optimization measures.
Liquiline CM442R is a state-of-the-art transmitter for pH, ORP, conductivity, oxygen, chlorine, turbidity, sludge level, SAC, nitrate and many other parameters.
Specs at a glance
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Input
1 to 2x Memosens digital input
2x 0/4 to 20mA Input optional
2x Digital input optional -
Output / communication
2 to 8x 0/4 to 20 mA current outputs
Alarmrelay, 2x relay, ProfibusDP, Modbus RS485,
Modbus TCP, Ethernet -
Ingress protection
Transmitter: IP20
Optional Display: IP66
Field of application
Liquiline CM442R allows you to connect up to 2 Memosens sensors of your choice from over 12 measurement parameters. With its extremely compact design, it fits into any cabinet - and even offers inputs, outputs, controllers, and math modules, e.g. for cleaning control. The transmitter belongs to the Liquiline platform with standardized system integration, operation, and spare parts. Heartbeat Technology helps you find the ideal balance between measurement point availability and maintenance costs.
Liquiline CM442R is suitable for all industries and their utilities, such as:
Food & Beverages
Life Sciences
Power & Energy
Water & Wastewater
Chemicals
Marine
It features the following communication protocols and interfaces:
0/4...20 mA
HART
PROFIBUS DP
Modbus RS485/RTU
Modbus TCP
EtherNet/IP
PROFINET
Webserver
The transmitter can be extended with a module whose explosion protection approvals, such as IECEx, ATEX and CSA, allow the connection of sensors installed in hazardous areas.
Benefits
Saves space, saves money:
Extremely small footprint, saves space in cabinets – perfect for skids.High-speed installation:
No cut-out in cabinet door, one-click DIN-rail mounting, minimized wiring.Simple and safe commissioning:
Saving configuration on SD card enables fast set-up on duplicate installations.Easy to operate and service:
Intuitive user interface, hot plug & play with pre-calibrated Memosens sensors, universal components fit all parameters.Process control from a distance:
Integrated web server that allows the operator to remotely view diagnostic data, perform configurations, or access device parameters in any web browser - even via Smartphone.Higher availability, lower costs:
Heartbeat Technology enables status-oriented maintenance and easy verification of the entire measuring point and helps to carry out optimization measures.Drive connectivity: Liquiline Edge Module CYY7 transfers process data to Netilion, independently of the fieldbus. This allows remote overview and the use of IIoT services. It’s available in new products or as upgrade to installed Liquiline platforms.
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 |
---|---|---|
Fundamental selection Meet your basic measurement needs |
Technical excellence
|
Simplicity
|
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
|
Simplicity
Variable |
Success stories
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Measuring principle
Potentiometric
-
Application
Modular 4 wire controller
Multichannel: 1/2 digital channels for Memosens protocol
Multiparameter: pH, redox, ISFET, conductivity inductive and conductive, dissolved oxygen, nitrate and turbidity
Two sensors connectable in any combination
Functionality modular extendable at any time
Plug and play for modules and sensors -
Characteristic
Robust plastic housing
All non-ex applications -
Design
2x Memosens input, 2 to 4x current output, alarmrelay
2x relay, SD card for software update and copy & paste of setup -
Material
DIN rail housing: PC-FR
Display seal: EPDM -
Dimension
99 x 100 x 97 mm
3.9 x 3.94 x 3.82 inch -
Process temperature
0 to 60 °C (32 to 140 °F)
-
Ingress protection
Transmitter: IP20
Optional Display: IP66 -
Input
1 to 2x Memosens digital input
2x 0/4 to 20mA Input optional
2x Digital input optional -
Output / communication
2 to 8x 0/4 to 20 mA current outputs
Alarmrelay, 2x relay, ProfibusDP, Modbus RS485,
Modbus TCP, Ethernet -
Additional certifications
EAC, cCSAus
-
Measuring principle
Sensor ORP / Redox
-
Application
Modular 4 wire controller
Multichannel: 1/2 digital channels for Memosens protocol
Multiparameter: pH, redox, ISFET, conductivity inductive and conductive, dissolved oxygen, nitrate and turbidity
Two sensors connectable in any combination
Functionality modular extendable at any time
Plug and play for modules and sensors -
Characteristic
Robust plastic housing
All non-ex applications -
Design
2x Memosens input, 2 to 4x current output, alarmrelay
2x relay, SD card for software update and copy & paste of setup -
Material
DIN rail housing: PC-FR
Display seal: EPDM -
Dimension
99 x 100 x 97 mm
3.9 x 3.94 x 3.82 inch -
Process temperature
0 to 60 °C (32 to 140 °F)
-
Ingress protection
Transmitter: IP20
Optional Display: IP66 -
Input
1 to 2x Memosens digital input
2x 0/4 to 20mA Input optional
2x Digital input optional -
Output / communication
2 to 8x 0/4 to 20 mA current outputs
Alarmrelay, 2x relay, ProfibusDP, Modbus RS485,
Modbus TCP, Ethernet -
Additional certifications
EAC, cCSAus
-
Measuring principle
Conductive
-
Application
Modular 4 wire controller
Multichannel: 1/2 digital channels for Memosens protocol
Multiparameter: pH, redox, ISFET, conductivity inductive and conductive, dissolved oxygen, nitrate and turbidity
Two sensors connectable in any combination
Functionality modular extendable at any time
Plug and play for modules and sensors -
Characteristic
Robust plastic housing
All non-ex applications -
Design
2x Memosens input, 2 to 4x current output, alarmrelay
2x relay, SD card for software update and copy & paste of setup -
Material
DIN rail housing: PC-FR
Display seal: EPDM -
Dimension
99 x 100 x 97 mm
3.9 x 3.94 x 3.82 inch -
Process temperature
0 to 60 °C (32 to 140 °F)
-
Ingress protection
Transmitter: IP20
Optional Display: IP66 -
Input
1 to 2x Memosens digital input
2x 0/4 to 20mA Input optional
2x Digital input optional -
Output / communication
2 to 8x 0/4 to 20 mA current outputs
Alarmrelay, 2x relay, ProfibusDP, Modbus RS485,
Modbus TCP, Ethernet -
Additional certifications
EAC, cCSAus
-
Measuring principle
Amperometric oxygen measurement
-
Application
Modular 4 wire controller
Multichannel: 1/2 digital channels for Memosens protocol
Multiparameter: pH, redox, ISFET, conductivity inductive and conductive, dissolved oxygen, nitrate and turbidity
Two sensors connectable in any combination
Functionality modular extendable at any time
Plug and play for modules and sensors -
Characteristic
Robust plastic housing
All non-ex applications -
Design
2x Memosens input, 2 to 4x current output, alarmrelay
2x relay, SD card for software update and copy & paste of setup -
Material
DIN rail housing: PC-FR
Display seal: EPDM -
Dimension
99 x 100 x 97 mm
3.9 x 3.94 x 3.82 inch -
Process temperature
0 to 60 °C (32 to 140 °F)
-
Input
1 to 2x Memosens digital input
2x 0/4 to 20mA Input optional
2x Digital input optional -
Output / communication
2 to 8x 0/4 to 20 mA current outputs
Alarmrelay, 2x relay, ProfibusDP, Modbus RS485,
Modbus TCP, Ethernet -
Additional certifications
EAC, cCSAus
-
Measuring principle
Total chlorine
-
Application
Modular 4 wire controller
Multichannel: 1/2 digital channels for Memosens protocol
Multiparameter: pH, redox, ISFET, conductivity inductive and conductive, dissolved oxygen, nitrate and turbidity
Two sensors connectable in any combination
Functionality modular extendable at any time
Plug and play for modules and sensors -
Characteristic
Robust plastic housing
All non-ex applications -
Design
2x Memosens input, 2 to 4x current output, alarmrelay
2x relay, SD card for software update and copy & paste of setup -
Material
DIN rail housing: PC-FR
Display seal: EPDM -
Dimension
99 x 100 x 97 mm
3.9 x 3.94 x 3.82 inch -
Process temperature
0 to 60 °C (32 to 140 °F)
-
Input
1 to 2x Memosens digital input
2x 0/4 to 20mA Input optional
2x Digital input optional -
Output / communication
2 to 8x 0/4 to 20 mA current outputs
Alarmrelay, 2x relay, ProfibusDP, Modbus RS485,
Modbus TCP, Ethernet -
Additional certifications
EAC, cCSAus
-
Measuring principle
Single beam scattered light
-
Application
Modular 4 wire controller
Multichannel: 1/2 digital channels for Memosens protocol
Multiparameter: pH, redox, ISFET, conductivity inductive and conductive, dissolved oxygen, nitrate and turbidity
Two sensors connectable in any combination
Functionality modular extendable at any time
Plug and play for modules and sensors -
Characteristic
Robust plastic housing
All non-ex applications -
Design
2x Memosens input, 2 to 4x current output, alarmrelay
2x relay, SD card for software update and copy & paste of setup -
Material
DIN rail housing: PC-FR
Display seal: EPDM -
Dimension
99 x 100 x 97 mm
3.9 x 3.94 x 3.82 inch -
Process temperature
0 to 60 °C (32 to 140 °F)
-
Ingress protection
Transmitter: IP20
Optional Display: IP66 -
Input
1 to 2x Memosens digital input
2x 0/4 to 20mA Input optional
2x Digital input optional -
Output / communication
2 to 8x 0/4 to 20 mA current outputs
Alarmrelay, 2x relay, ProfibusDP, Modbus RS485,
Modbus TCP, Ethernet -
Additional certifications
EAC, cCSAus
-
Measuring principle
Ultrasonic sensor
-
Application
Modular 4 wire controller
Multichannel: 1/2 digital channels for Memosens protocol
Multiparameter: pH, redox, ISFET, conductivity inductive and conductive, dissolved oxygen, nitrate and turbidity
Two sensors connectable in any combination
Functionality modular extendable at any time
Plug and play for modules and sensors -
Characteristic
Robust plastic housing
All non-ex applications -
Design
2x Memosens input, 2 to 4x current output, alarmrelay
2x relay, SD card for software update and copy & paste of setup -
Material
DIN rail housing: PC-FR
Display seal: EPDM -
Dimension
99 x 100 x 97 mm
3.9 x 3.94 x 3.82 inch -
Process temperature
0 to 60 °C (32 to 140 °F)
-
Ingress protection
Transmitter: IP20
Optional Display: IP66 -
Input
1 to 2x Memosens digital input
2x 0/4 to 20mA Input optional
2x Digital input optional -
Output / communication
2 to 8x 0/4 to 20 mA current outputs
Alarmrelay, 2x relay, ProfibusDP, Modbus RS485,
Modbus TCP, Ethernet -
Additional certifications
EAC, cCSAus
-
-
Technical Information (TI)
TI Liquiline CM442R/CM444R/CM448R
English version - 03/2025
New version available in English
Cabinet controller with a maximum of eight measuring channels based on digital Memosens technology
EN 12/03/202528/08/202410/08/202203/05/202211/05/2020Language:
English
Version:
12/03/2025
File size:
6.7 MB
File name:
TI01112CEN_1325-00.pdf
-
-
-
Technical Information (TI)
TI Liquiline CM442R/CM444R/CM448R
-
Technical Information (TI)
English version - 03/2025Cabinet controller with a maximum of eight measuring channels based on digital Memosens technology
EN 12/03/202528/08/202410/08/202203/05/202211/05/2020Language:
English
Version:
12/03/2025
File size:
6.7 MB
File name:
TI01112CEN_1325-00.pdf
-
-
-
Operating Instruction (BA)
Memosens
-
Operating Instruction (BA)
English version - 05/2022Sensor inputs with Memosens protocol
EN 30/05/202228/02/2019Language:
English
Version:
30/05/2022
File size:
3.3 MB
File name:
BA01245CEN_0822-00.pdf
-
-
-
Operating Instruction (BA)
BA Liquiline CM442R/CM444R/CM448R
-
Operating Instruction (BA)
English version - 03/2025Universal four-wire multichannel controller
Cabinet installationEN 19/03/202525/09/202310/08/202208/10/202120/04/2021Language:
English
Version:
19/03/2025
File size:
8.7 MB
File name:
BA01225CEN_1825-00.pdf
-
-
-
Operating Instruction (BA)
Istruzioni di funzionamento Liquiline CM442R/CM444R/CM448R
-
Operating Instruction (BA)
Italian version - 06/2013Controllore universale multicanale a quattro fili per installazione in
armadio
di controllo
Manutenzione e diagnosticaEN 27/06/2013Language:
Italian
Version:
27/06/2013
File size:
1.4 MB
File name:
BA01227CIT_0113.PDF
-
-
-
Short Instruction (KA)
KA Liquiline CM442R/CM444R/CM448R
-
Short Instruction (KA)
English version - 09/2023Universal four-wire multichannel controller for cabinet installation
EN 25/09/202312/08/202208/10/202120/04/202130/11/2019Language:
English
Version:
25/09/2023
File size:
3.9 MB
File name:
KA01160CEN_1123-00.pdf
-
-
-
Installation Instructions (EA)
SD card kit
-
Installation Instructions (EA)
English version - 03/202132 GB, industrial flash drive
EN 23/03/2021Language:
English
Version:
23/03/2021
File size:
506.7 KB
File name:
EA01354CEN_0121.pdf
-
-
-
Installation Instructions (EA)
Kit CM44xR
-
Installation Instructions (EA)
English version - 02/2023External display
EN 24/02/202327/06/2013Language:
English
Version:
24/02/2023
File size:
1.1 MB
File name:
EA01080CEN_0223-00.pdf
-
-
-
Installation Instructions (EA)
Kit CM44x/CSXxx/CA80XX
-
Installation Instructions (EA)
English version - 11/2022Module 485MB or 485DP
For Ethernet configuration, PROFIBUS DP, Modbus RS485EN 28/11/2022Language:
English
Version:
28/11/2022
File size:
1.8 MB
File name:
EA01447CEN_0122-00.pdf
-
-
-
Installation Instructions (EA)
Installation Instructions Liquiline CM44xR
-
Installation Instructions (EA)
English version - 03/2014Service display for rail mounted device
EN 06/03/2014Language:
English
Version:
06/03/2014
File size:
138.3 KB
File name:
EA01100CA2_0113.pdf
-
-
-
Installation Instructions (EA)
Kit 2DS Ex-i module for CM44x(R) / CM44P
-
Installation Instructions (EA)
English version - 07/2022Replacement / repair of the 2DS Ex-i module for CM44x(R) / CM44P
EN 04/07/2022Language:
English
Version:
04/07/2022
File size:
3.5 MB
File name:
EA01413CEN_0122-00.pdf
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