DISSOLVED OXYGEN SENSOR COG-1B
COG-1B dissolved oxygen sensor is designed for measurements of oxygen dissolved in natural water, waste water, sewage and in water solutions.
The sensor may be used with the immersing heads made by ELMETRON.
Special connector with thread enables screwing the sensor into in the heads.
The sensors are designed for cooperation with the on-line meters like 421 series or 801 and 804 controllers.
They can also be used in multi-parameter head - GXZ-3tk for the portable instruments like CX-401, CX-461 and CX-601 or CX-705 with field cases.
Characteristic features:
- The sensor is equipped with a teflon membrane with a great chemical resistivity, high selectivity and good oxygen permeability. Membrane is placed in an easy to replace cap.
- Negatively charged silver cathode has increased resistivity to sulphides contamination, what enables using the sensor in heavily polluted water like industrial or municipal waste water.
- The sensor is equipped with an internal temperature compensation system, which makes corrections dependent on the temperature and membrane permeability.
- May be calibrated in % of saturation in 1 or 2 points in 0% solution and than in 100% in the air.
- Gases like chlorine, sulfur dioxide, hydrogen sulfide, amines, ammonia or carbon dioxide may cause errors in measurements.
- Easy maintenance and short calibration time make working easier.
- This COG-1B may work for many years, just the user has to remember about simple periodical maintenance operations.
- The sensor ensures good accuracy of the measurement for a very competitive price in comparison with other manufacturer
The COG-1B sensor works on the galvanic cell principle. It consists of a silver cathode and a zinc anode placed in the electrolyte solution, separated from the measured solution by the membrane, which is permeable for the oxygen. The dissolved oxygen diffuses through the membrane and is reduced on the cathode, what generates voltage proportional to the partial pressure of the oxygen at current temperature.
Technical Data
| Measuring range % | 0 ÷ 600 % |
|---|---|
| Measuring range mg/l | 0 ÷ 60 mg/l |
| Accuracy | at calibration temperature ±1 % * |
| Temperature measurement accuracy | in range 0 ÷ 40 °C ±0.5 °C |
| Acceptable temperature of measured solution | 0 ÷ 40 °C |
| Temperature compensation range |
0 ÷ 40 °C (for mg/l measurement) |
| Signal of the probe for solutions (in 20 °C ) | In 100 % O2 saturation 20 ÷ 25 mV in 0 % O2 saturation max 0.3 mV |
| Time of response T 99 | below 1 minute |
| Internal compensation | yes (thermistor) |
| Cathode material | silver |
| Anode material | zinc |
| Membrane material | teflon foil |
| Body and membrane cap material | PVC |
| Electrolyte | KCl 0.5 mol/l |
| Body diameter | 12.0 mm ±0.5 mm |
| Body length (to thread) | 120 mm ±5 mm |
| Connector | chinch, with M16 thread |
| * | By the difference ±5 °C accuracy: ±3 %, by the difference ±10 °C accuracy: ±5 %. |