For measurement of oxygen (O2), the zirconia (ZrO2) lambda sensor is used by Protea. This sensor responds to the difference in oxygen concentration on the sample gas side of the sensor, compared to the reference side (ambient air). This response manifests itself as a non-linear induced voltage. This voltage is linearised and calibrated via electronics to give a concentration reading in %Volume.
The zirconia sensor is ideally suited as a complimentary analyser to the multi-gas measurements of infra-red systems where oxygen content is required for compliance and reporting purposes.