Application
The continuous measurement of the dissolved oxygen
concentration is very important in many areas of water
management:
• Sewage treatment plants:
Oxygen measurement and regulation in the activated sludge
basin for a highly efficient biological cleaning process
• Water monitoring:
Oxygen measurement in rivers, lakes or seas as an indicator of
the water quality
• Water treatment:
Oxygen measurement for status monitoring of drinking water
for example (oxygen enrichment, corrosion protection etc.)
• Fish farming:
Oxygen measurement and regulation for optimum living and
growth conditions
Your benefits
• Maximum measurement accuracy:
– Long maintenance intervals
– Intelligent sensor self monitoring
• Membrane covered sensor, i.e.:
– high O2 selectivity
– Minimum maintenance effort
– Minimum calibration effort thanks to simple calibration in

air

Measuring system A complete measuring system comprises at least:
• Oxygen sensor
• Transmitter, e.g. Liquisys M COM223/253
• Special measuring cable
• Assembly, e.g. flow assembly COA250, immmersion assembly CYA611 or retractable assembly COA451
Optional:
• Universal suspension assembly support CYH101 for immersion operation
• Junction box VBM (with cable extension)
• Automatic spray cleaning system Chemoclean

Measuring range with Liquisys M COM 223/253-DX/DS:
0.05 ... 20.00 mg/l (ppm)
0.00 ... 200 % SAT
0 ... 400 hPa