DO70G optical dissolved oxygen sensor is designed for using in water treatment plants such as sewage treatment works and effluent activated sludge process.
This optical sensor has a fast response time and good long term stability, and features replaceable sensor cap and cable for easy maintenance. A temperature sensor is incorporated for compensation. The DO70G sensor can be used in either the PB350G/PB360G floating ball holder or in the DOX8HS submersion type holder.
Details
- A Optical DO sensor that uses a phase measurement method and realizing stable measurements over a long period of time.
- Measuring range of 0 to 25 mg/l.
- A sensor cap that is easily replaceable by anyone.
Dissolved Oxygen | 0 to 25 mg/l (ppm) |
Liquid Temperature | 0 to 50℃ |
Liquid Pressure | 0 to 500 kPa |
Flow speed | 20 cm/s or more |
Sensor for Temperature Compensation | 22k NTC |
Cable Length | 3, 5, 10 m |
Weight | Sensor; Approx. 0.1 kg Cable; 3 m; Approx. 0.4 kg / 5 m; Approx. 0.6 kg / 10 m; Approx. 1.1 kg |
Repeatability | 0.1 mg/l or 3% FS, whichever is greater |
Temperature Compensation Error | Within ±3% FS for a ±5℃ change in the range of 0 to 40℃ |
Response Time | Within 120 sec. (90 % response) |
Resources
Having too much oxygen in the process is not a problem for the biological system; however the cost for generating the oxygen is one of the largest expenses. By obtaining a good representative average of the dissolved oxygen present in the basin could save the plant large amounts of money. For this reason multiple measurements points are sometimes put into place.
In a batch tank, analyzers such as dissolved oxygen (DO) analyzers, oxidation-reduction potential (ORP) meters, and mixed liquor suspended solid (MLSS) analyzers are used. To reduce the maintenance frequency, measures must be taken to prevent dirt accumulation on the sensor. As the liquid level in a tank can vary greatly, great care should be taken when selecting the sensor installation position in a tank.
When used to measure the dissolved oxygen in an aeration tank, sensors tend to quickly become contaminated and need frequent cleaning.
Removal of free oil and grease from a wastewater stream reduces the potential for equipment problems to occur further downstream. There are three forms of oil encountered in wastewater treatment at a refinery.
Downloads
Brochures
Instruction Manuals
General Specifications
- DO70G Sensor for Dissolved Oxygen Analyzer (713 KB)
- Sensor Holders (3.2 MB)
Drawings
- DOX10 Power Supply Unit (372 KB)
- DO70G Optical Dissolved Oxygen Sensor (361 KB)
- DOX8W Calibration Set (230 KB)
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