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.
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. 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 entire tank.
An additional option for use regarding in-line applications is a full bore measurement chamber suitable for use up to 6 Bar pressure.
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.
| Physical | |
|---|---|
| Dimensions (hxwxd) | Ø58mm, 88 mm long |
| Weight | 0.5 kg |
| Protection Class | IP68 |
| Enclosure Material | Polyoxymethylene (POM) with HDPE membrane |
| Cable Entry | Integral Cable Gland |
| Cable Length | 10 metres standard, 100 metres maximum |
| Interface to Monitor | |
| Power Supply | 12 VDC from Monitor |
| Sensor Output | ModTechw², RS485 |
| Environmental Data | |
| Operating/Storage Temperature | 0 to 50ºC |
| Location | Indoor/Outdoor |
| Pressure Rating | 5 Bar |
| Maintenance | |
| Service | No 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. |
| Calibration | The sensor is inherently stable, calibration should be carried out to suit the application. Our recommendation is every 6 months. |
| Measurement Characteristics | |
|---|---|
| Principal of Operation | Galvanic Oxygen Partial Pressure Cell, Self Polarising, Self Temperature Compensating Iron/Silver Electrode Combination |
| Temperature | NTC |
| Accuracy | +/- 0.1 mg/l or +/- 1%Sat |
| Repeatability | Better than +/- 1% FSD |
| Display Resolution | see 7300w² Monitor |
| Response Time | 90% of step change in less than 90 seconds |
| Flowrate | 1 cm/second |
| Units | mg/l, ppm, %Sat |
| Range | 0-20 mg/l (ppm) 0-200 %Sat |
| Part Number | Description |
|---|---|
| 224006 | OxyTechw² GAL Sensor (Range 0-20 mg/l, Cable Length: 10 metres) |
| 224007 | OxyTechw² GAL Sensor (Range 0-20 mg/l, Cable Length: 20 metres) |
| Mounting Shaft with Self Clean Option | |
| 224529 | FlexTech Shaft Assembly with Flexible Coupling (OxyTechw² GAL Sensor, 1.0 metres) |
| 224531 | FlexTech Shaft Assembly with Flexible Coupling (OxyTechw² GAL Sensor, 2.0 metres) |
| 224533 | FlexTech Shaft Assembly with Flexible Coupling (OxyTechw² GAL Sensor, 3.0 metres) |
| Mounting Shaft without Self Cleaning | |
| 224523 | FlexTech Shaft Assembly (OxyTechw² GAL Sensor, 1.0 metres) |
| 224525 | FlexTech Shaft Assembly (OxyTechw² GAL Sensor, 2.0 metres) |
| 224527 | FlexTech Shaft Assembly (OxyTechw² GAL Sensor, 3.0 metres) |
| Mounting Brackets | |
| 223980 | FlexTech Sensor Bracket (Handrail Ø40 to 60.3 mm) |
| 224567 | FlexTech Extension Bracket Assembly (500mm Long, Handrail Ø40 to 60.3 mm) |
| Service Pack | |
| 225690 | OxyTechw² GAL Sensor Refurbishment Kit |
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