DISSOLVED OXYGEN SENSOR COG-2

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COG-2 is a galvanic sensor designed for measurements of oxygen saturation in the air and dissolved oxygen concentration in natural water, sewage or saline water. It is recommended to be used in deeper immersion. Standard cable length is 5 m. The metal weight holds the sensor on the appropriate level. The cable may be longer after individual arrangements with the customer.

Characteristic features:

• High measurement accuracy at an affordable price in comparison with offers of other manufacturers.
• Wide measuring range which enables usage in highly oxygenated (supersaturated) water.
• Long term signal stability facilitates work and lowers the costs of maintenance and usage.
• Large membrane surface prolongs the working time with one membrane before its replacement.
• Easy maintenance and short calibration time make working easier.
• The sensor may work for many years provided that the periodical maintenance operations are carried out.
• For oxygen measurement in the air one point calibration at 20,9 % is possible, for oxygen measurement in water one- and two- point calibration - at 0 %, and next in the air – at 100 % can be made.
• In case of measurements of dissolved oxygen in mg/l unit the temperature, salinity and atmospheric pressure influence needs to be taken into consideration. The Elmetron meters enable manual or automatic adjustments and corrections.
• High accuracy and repeatability of the readings can be obtained under condition of a flow of the sample in close proximity to the membrane (a few cm/s). The lack of flow will result in lowering the reading value due to gradual oxygen consumption, by the sensor, in proximity to the membrane. In vessels without flow a slow, circular movement imitates it and provides stability of reading, using a stirrer can also solve this problem.
• Using the zinc as an anode material is less harmful for the environment than using a lead and enables fulfilling the RoHS directive requirements. Negatively loaded silver cathode has higher resistance to contamination with sulphides, what makes the sensor very useful in measurements of heavily contaminated liquids such as industrial and municipal waste water.
• Gases such as chlorine, sulphur dioxide, hydrogen sulphide, amines, ammonia or carbon dioxide may cause interference in the measurements.
• The Teflon foil membrane provides great chemical resistivity, high selectivity and good oxygen permeability. The membrane is mounted in a cap, which is easy to replace.
• The sensor is equipped with an internal temperature compensation system, which makes corrections dependent on the temperature and membrane permeability.
• The COG-2 is equipped with a built-in temperature sensor (Pt-1000), there is no need to use additional temperature sensor.
• The sensor is prepared to work with the Elmetron meters.