
Specs at a glance
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Measurement range
0.01 to 100 mg/l
0.00 to 1000 %SAT
0 to 2000 hPa -
Process temperature
-5 to 50 °C
(20 to 120 °F) -
Process pressure
max. 10 bar
(max. 145 psi)
Field of application
Oxymax COS51D is a reliable and highly accurate oxygen sensor for all kinds of water & wastewater applications (including hazardous areas). Designed to be low-maintenance with a long operating life, the sensor offers outstanding value for money. Thanks to Memosens digital technology, the Oxymax COS51D combines maximum process and data integrity with simple operation. It resists corrosion and moisture, enables lab calibration and facilitates predictive maintenance.
Oxymax COS51D measures the dissolved oxygen concentration in:
Wastewater treatment plants:
- O2 control in the aeration basin
- Process water treatment and monitoringWater works:
- Status monitoring of drinking water (oxygen enrichment, corrosion protection, etc.)
- Water quality monitoring in rivers, lakes or seasUtilities of all industries:
- O2 control in the biological treatment
- Process water treatment and monitoring
The sensor is suitable for hazardous area use (ATEX, FM, CSA).
Benefits
Maximum measurement accuracy
Logging of sensor load data for easy traceability
Intelligent, self-monitoring sensor
Minimum calibration effort thanks to simple air calibration
Long maintenance intervals
Approved for hazardous area use
Videos
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The concentration of oxygen dissolved in a liquid can be measured using the amperometric or optical measuring principles. This video shows what it is about and how these measuring principles work.
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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 |
Predecessor
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Measuring principle
Amperometric oxygen measurement
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Application
Aeration tank, river monitoring, water treatment, fish farming, sewage treatment plants
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Characteristic
Amperometric 3-electrode longterm-stable sensor to measure dissolved oxygen
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Measurement range
0.01 to 100 mg/l
0.00 to 1000 %SAT
0 to 2000 hPa -
Measuring principle
Closed membrane covered amperometric 3-electrode system
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Design
Digital signal transmission
Calibration datas stored in the sensor -
Material
Sensor body: POM
Membrane cap: POM -
Dimension
Diameter: 40mm (1.57 inch)
Shaft length: 144 mm (5.67 inch) -
Process temperature
-5 to 50 °C
(20 to 120 °F) -
Process pressure
max. 10 bar
(max. 145 psi) -
Connection
Memosens connector
Process: G1, NPT 3/4"
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