3.4 Zirconia Oxygen Sensor
The Zirconia Oxygen Sensor is used to measure the concentration of oxygen present in the gas sample as a
percentage. Sensing is performed by a layer of zirconium dioxide heated to a high temperature. The sample
gas is presented on one side and a reference gas to the other. The diffusion of oxygen through the layer
produces a “Nernst Voltage” which is proportional to the natural log ratio of oxygen concentrations of the
gases across the layer. The sensing element is consumable, which should be replaced every four years to
provide uninterrupted service. It has a high rate of data throughput which can produce accurate results every
twenty seconds per cage. This sensor is commonly employed in large, multi-channel CLAMS and Oxymax
systems.
3.4.1 Zirconia Oxygen Sensor Specifications
O
2
Range: 13.5%-24.5%
O
2
Resolution: 0.00005%
Physical Size (WxHxD): 30cm x 20cm x 35cm
Physical Weight: 5kg
Power Requirements: 24VDC 2.7A, 24W
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