3.3 Chemical Oxygen Sensor
The Chemical Oxygen Sensor is used to measure the concentration of oxygen present in the gas sample as a
percentage. Sensing is performed by an electrochemical cell. Sample air diffuses through a membrane on the
end of the cell which drives a chemical reaction, which generates a voltage. This voltage is proportional to the
oxygen concentration in the gas sample. The cell is consumable, which should be replaced every nine months
to provide uninterrupted service. It produces accurate results at a rate of two minutes per cage.
3.3.1 Chemical Oxygen Sensor Specifications
O
2
Range: 0%-27%
O
2
Resolution: 0.0001%
Physical Size (WxHxD): 30cm x 11cm x 35cm
Physical Weight: 3kg
Power Requirements: 24VDC 1A, 12W
1. Power – A green light which indicates connection to a source of DC power.
2. Data In – A yellow light which indicates the host computer is transmitting data.
3. Data Out – A blue light which indicates the Oxygen Sensor is transmitting data.
4. Temperature Stable – A green lights which indicates the status of the gas sampling circuit.
OFF: The sample heater is switched off.
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