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OxyTechw² GAL Dissolved Oxygen Sensor

Galvanic Dissolved Oxygen Sensor

The OxyTechw² GAL Sensor has been designed to provide highly reliable Dissolved Oxygen measurements. The sensor employs the traditional galvanic principle.

The rugged 100 micron, HDPE membrane has been selected to provide exceptional resistance to damage. This, combined with Oxyguard’s unique electrolyte and anode material provides long term stability of 3 years and longer without the need for sensor refurbishment or membrane replacement.

The OxyTechw² GAL 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.

For installation in activated sludge plants (ASP’s) we recommend that the sensor is installed using our specially designed self cleaning mounting system, with a flexible joint in the mounting shaft, this 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 entire tank.

For specialist advice call:

+44 (0)1726 879800

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  • General Specification
  • Measurement Specification
  • Ordering Information and Spare Parts
Dimensions (hxwxd)Ø58mm, 88 mm long
Weight0.5 kg
Protection ClassIP68
Enclosure MaterialPolyoxymethylene (POM) with HDPE membrane
Cable EntryIntegral Cable Gland
Cable Length10 metres standard, 100 metres maximum
Interface to Monitor
Power Supply12 VDC from Monitor
Sensor OutputModTechw², RS485
Environmental Data
Operating/Storage Temperature0 to 50ºC
Pressure Rating5 Bar
ServiceNo routine service

Periodic cleaning is required at a frequncy determined by the application. Our self cleaning shaft option is highly recommended, this eliminates manual cleaning between calibrations.
CalibrationThe sensor is inherently stable, calibration should be carried out to suit the application. Our recommendation is every 6 months.
Measurement Characteristics
Principal of OperationGalvanic Oxygen Partial Pressure Cell, Self Polarising, Self Temperature Compensating

Iron/Silver Electrode Combination
Accuracy+/- 0.1 mg/l or +/- 1%Sat
RepeatabilityBetter than +/- 1% FSD
Display Resolutionsee 7300w² Monitor
Response Time90% of step change in less than 90 seconds
Flowrate1 cm/second
Unitsmg/l, ppm, %Sat
Range0-20 mg/l (ppm)
0-200 %Sat
Part NumberDescription
224006OxyTechw² GAL Sensor (Range 0-20 mg/l, Cable Length: 10 metres)
224007OxyTechw² GAL Sensor (Range 0-20 mg/l, Cable Length: 20 metres)
Mounting Shaft with Self Clean Option
224529FlexTech Shaft Assembly with Flexible Coupling (OxyTechw² GAL Sensor, 1.0 metres)
224531FlexTech Shaft Assembly with Flexible Coupling (OxyTechw² GAL Sensor, 2.0 metres)
224533FlexTech Shaft Assembly with Flexible Coupling (OxyTechw² GAL Sensor, 3.0 metres)
Mounting Shaft without Self Cleaning
224523FlexTech Shaft Assembly (OxyTechw² GAL Sensor, 1.0 metres)
224525FlexTech Shaft Assembly (OxyTechw² GAL Sensor, 2.0 metres)
224527FlexTech Shaft Assembly (OxyTechw² GAL Sensor, 3.0 metres)
Mounting Brackets
223980FlexTech Sensor Bracket (Handrail Ø40 to 60.3 mm)
224567FlexTech Extension Bracket Assembly (500mm Long, Handrail Ø40 to 60.3 mm)
Service Pack
225690OxyTechw² GAL Sensor Refurbishment Kit

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