Partech (Electronics) Ltd.

Model OxyTechw2 OPT - Optical Sensor for Dissolved Oxygen Monitoring



The OxyTechw² OPT Sensor has been designed to provide highly reliable Dissolved Oxygen measurements using the industry accepted optical luminescent technology. Optical measurement of dissolved oxygen offers some improvement over older galvanic type sensors, this includes extended times between maintenance, no drift, a faster response and allows installation in applications where there is low or no flow.


For installation in activated sludge plants (ASP's) we recommend that the sensor is installed using our specially designed mounting system, with a flexible joint in the mounting shaft. The flexible joint moves the sensor in the process, keeping the membrane clean by reducing bio-fouling without the use of a compressor and with the added benefit of allowing rags to fall away from the assembly. This motion is similar to that achieved by using a floating ball assembly, with the added advantage of placing the sensor below the surface of the liquor. This means that the sensor is below the level of the floating fats and greases that accumulate at the surface and results in the Dissolved Oxygen reading being more representative of the whole tank.

The OxyTechw² OPT provides the reliable, accurate measurement that is required to operate activated sludge plants at the optimum Dissolved Oxygen concentration, maintaining the balance between the running costs of blowers and aerators and the need to produce high quality effluent.

  • Activated Sludge Control
  • River Quality Monitoring
  • Aquaculture

  • No minimum flow
  • Fast Response
  • Minimal Maintenance


Dimensions 25 mm diameter x 148.5 mm long
Weight 0.45 kg
Protection Class IP68
Material of Construction 316L Stainless Steel
Cable Entries Integral Cable Gland
Cable Type 6 core, Polyurethane Coated
Cable Length 10 metres standard, 100 metres maximum
Service Requirement Membrane Cap Replacement yearly
Periodic cleaning and calibration are required at a frequency determined by the application

Environmental Data

Operating Temperature  0 - 50ºC
Storage Temperature  -10 to 60ºC
Pressure Rating  5 Bar
Location  Indoor

Interface to Monitor

Sensor Output ModTechw², RS485
Power 12 VDC from Monitor

Measurement Principal

Principal of Operation Optical measurement of luminescence
Blue LED light source
Temperature Measurements NTC

Measurement Characteristics

Accuracy +/- 0.1 mg/l or +/- 1% SAT
Resolution 0.01
Repeatability Better than +/- 1% FSD on real sample
Response Time 90% of step change in less than 60 seconds
Flowrate No flow required
Range 0-20.00 mg/l or ppm
0-200 %SAT

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