©Endress+Hauser
Specs at a glance
Output / communication
0/4-20mA, Hart, Profibus.
Field of application
Liquisys COM223 is a standard transmitter for use with COS41 and COS61 oxygen sensors. It improves your operational safety thanks to continuous plausibility, process and sensor checks. Select from numerous hardware and software modules, such as relays or fieldbus communication, to adapt it exactly to your measuring task. This modularity also allows you to upgrade the transmitter at any time. A simple menu and calibration make configuration and operation fast and easy.
The Liquisys COM223 transmitter works with Oxymax COS41 and Oxymax COS61 dissolved oxygen sensors in environmental applications, such as:
O2 control in the aeration basin
O2 control and monitoring of drinking water
Surface water monitoring
Process water treatment and monitoring
O2 control in fish farming for optimum growth conditions
Liquisys COM223 features the following protocols and interfaces:
0/4...20 mA
HART
PROFIBUS DP
PROFIBUS PA
Benefits
More operational safety: Continuous process check system, customized alarm configuration, calibration plausibility check.
Reliable oxygen control: Current input for flow rate monitoring with controller shut off or for feedforward control.
Easy to operate and service: Simple single-point calibration in air, air-saturated water or in the medium, direct access for manual contact control.
Reduced maintenance: Automatic cleaning function (with Chemoclean) triggered by alarm or limit switch.
Fit for every application: Numerous extensions, e.g. P(ID) controller, timer, etc., allow for flexible adaption to all processes.
Success stories
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Simple products
Easy to select, install and operate
Technical excellence
Simplicity
Standard products
Reliable, robust and low-maintenance
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High-end products
Highly functional and convenient
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Specialized products
Designed for demanding applications
Technical excellence
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FLEX selections
Technical excellence
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Fundamental selection
Meet your basic measurement needs
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Lean selection
Handle your core processes easily
Technical excellence
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Extended selection
Optimize your processes with innovative technologies
Technical excellence
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Xpert selection
Master your most challenging applications
Technical excellence
Simplicity
Measuring principle
Amperometric oxygen measurement
Application
Water, waste water, process
Characteristic
4-wire transmitter with a two-line display
Design
Dissolved oxygen transmitter in a panel housing.
Dimension
96mm x 96mm x 146mm(built in depth)
Temperature sensor
Display and current output
Output / communication
0/4-20mA, Hart, Profibus.
Certificates, declarations and approvals
Most downloaded
Product family: Liquiline, Liquiline M, Liquisys chlorine, Liquisys oxygen, Liquisys pH/ORP
Russian version - 02/2025
Product root: CCM223-, CCM253-, CM14-, CM42-, CM442-, CM442R-, CM444-, CM444R-, CM448-, CM448R-, CM44P-, CM72-, CM82-, COM223-, COM2
53-, CPM223-, CPM253-
Region: Eurasian Economic Union
Approval agency: EAC
Approval number: ЕАEС KZ 7500525.13.12.00639
Language:
Russian
Version:
11/02/2025
File size:
1.2 MB
File name:
KZ 7500525.13.12.00639.pdf
21 documents
Liquisys M COM223/253
Technical Information
Transmitter for oxygen sensors
EN
German French Italian Polish Russian Turkish Chinese
31/12/2014
24/10/2013
20/06/2011
15/09/2005
01/07/2005
Language:
English
Version:
31/12/2014
File size:
822 KB
File name:
TI00199CEN_1514.pdf
Operating Instructions Liquisys M CXM223/253 PROFIBUS
Field Communikation for Liquisys M CXM223/253
EN
German French Italian Polish
01/12/2011
01/08/2009
01/09/2007
01/07/2006
01/10/2005
Language:
English
Version:
01/12/2011
File size:
1.7 MB
File name:
BA209CEN_1311.pdf
Operating Instructions Liquisys M CXM223/253 HART
Field Communication with Liquisys M CXM223/253
EN
German French
01/10/2005
01/07/2002
Language:
English
Version:
01/10/2005
File size:
541.4 KB
File name:
BA208CEN.pdf
Model 840 / 842
Operating instructions
Transmitter for dissolved oxygen
Language:
English
Version:
01/07/2002
File size:
1.7 MB
File name:
BA199e10.pdf
Liquisys M COM223/253
Operating Instructions
Transmitter
EN
Czech Danish German Spanish French Italian Japanese Dutch Polish Portuguese Russian Chinese
01/09/2015
24/10/2013
20/06/2011
15/09/2005
01/07/2005
Language:
English
Version:
01/09/2015
File size:
2.4 MB
File name:
BA00199CEN_1515.pdf
Transmitter for dissolved oxygen
EN
Bulgarian Czech Danish German Greek Spanish Estonian Finnish French Croatian Hungarian Indonesian Italian Japanese Korean Lithuanian Latvian Dutch Norwegian Polish Portuguese Romanian Russian Slovak Slovenian Swedish Thai Turkish Chinese
02/10/2025
18/07/2025
Language:
English
Version:
02/10/2025
File size:
750.8 KB
File name:
KA01762CEN_0225-00.pdf
Ex-safety instructions CXM2X3
Safety instructions for electrical apparatus for explosion-hazardous
EN
German French
07/06/2005
27/09/2004
29/02/2004
Language:
English
Version:
07/06/2005
File size:
2.5 MB
File name:
XA194CA3.pdf
Additional information for CSA Liquisys
Additional information for CSA Liquisys
Language:
English
Version:
24/09/2013
File size:
84.3 KB
File name:
CXM2X3_Beiblatt for CSA.pdf
Instructions for service kits Liquisis M
Special documentation
Language:
English
Version:
01/05/2000
File size:
156.7 KB
File name:
SD083CA2.pdf
Product family: Liquisys oxygen
Product root: COM223-
EN
German French Chinese
15/07/2025
Language:
English
Version:
15/07/2025
File size:
335 KB
File name:
HE_02183_01.25_COM223.pdf
60 spare parts & accessories
60 spare parts & accessories
60 spare parts & accessories
Kit CXM2X3 Relaismod. 2rel
KIT CXM2X3 relay mod. 2rel / CSA
Drawing number
Order code
290
51511446
Kit CXM2X3 Relaismodule 4rel
Drawing number
Order code
300
51500321
KIT CXM2X3 relay mod. 4rel / CSA
Drawing number
Order code
300
51511447
Kit CXM2X3 Relais Mod. 2rel.+I/CSA
Drawing number
Order code
290
51504304
Kit CXM2X3 Relais Mod. 4Rel+I/CSA
Drawing number
Order code
300
51504305
KIT CXM2X3 power supply 100..230 V AC
Drawing number
Order code
10
51500317
KIT CxM2x3 power supply 24 AC/DC
Drawing number
Order code
20
51500318
Kit CXM223 housing assembly
Drawing number
Order code
330
51501075
KIT CXM223 Mechanical housing parts
Drawing number
Order code
310
51502124
Kit CXM223 End frame Profibus DP
Drawing number
Order code
340
51502513
KIT CXM223 Terminal strip
Drawing number
Order code
430
51501078
KIT MKO1 Transmitter O2/Temperature
Drawing number
Order code
250
51501207
KIT MKO1 Transmitter O2/Temp./pressure
Drawing number
Order code
250
51501208
KIT MKO5 Transmitter O2/Temp./pressure
Drawing number
Order code
260
51506938
KIT COM2x3 Central module I1
Drawing number
Order code
40
51501225
KIT COM2x3 Central module I1 HART
Drawing number
Order code
60
51501223
KIT COM2x3 Central module I2
Drawing number
Order code
50
51501222
KIT COM2x3 central module I2 HART
Drawing number
Order code
70
51501226
KIT COM2X3 central module Profibus PA
Drawing number
Order code
80
51501227
Kit COM2X3 central module Profibus DP
Drawing number
Order code
90
51502500
Kit COM2x3: Central mod. PB DP; H/W 2.1x
Drawing number
Order code
90
71134729
Kit CxM2x3: Relay mod. for PBDP; H/W2.1x
Drawing number
Order code
290
71134732
KIT COM223 terminal strip set
Drawing number
Order code
424
51501204
KIT COM223 terminal strip Profibus PA
Drawing number
Order code
424
51502127
Kit COM223 terminal strip, Profibus DP
Drawing number
Order code
424
51502492
Kit CxM223: Front foil + 6 key lifters
Drawing number
Order code
335
71071440
Upgrade "Plus-Package" for LIQUISYS-M
Upgrade Kit from COS41 to COS31+COS61
Drawing number
Order code
260
51517800
Upgrade "Plus-Package" for COM 2X3
Upgrade cleaning for LIQUISYS-M
Mounting bracket 96x96 Housing
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