There are not many principles of gas sensors： catalytic combustion, electrochemistry, infrared and PID.
The cross-sensitivity mentioned by the subject includes cross interference and cross calibration. Strictly speaking, there is a measure when describing cross-sensitivity Called the cross coefficient (CF).
Taking catalytic combustion as an example, because of the problem of its principle, in theory, all the gases that can be burned can be detected, so two problems arise, how to reduce interference and how to detect some uncommon combustible gases. For each sensor shipped from the factory, it is necessary to use a standard gas to calibrate. Common standard gases are methane and propane. The sensor calibrated by each standard gas will react to all combustible gases, but only the calibration gas is accurately detected, so it is necessary to know the interference value of the sensor calibrated by a different gas to a certain gas. This is the cross coefficient. It is used to measure the severity of the influence of different gases on the sensor.
When the gas sensor is used, there will be one or one type of target gas to be responded by the sensor, and the gas other than this one or type of target gas makes the sensor respond, then this gas is the cross-interference gas. The response value of the cross-interference gas per unit concentration is the cross-interference sensitivity. How much gas can cause cross interference to the sensor, and how sensitive is the sensor to the interfering gas? This is the cross sensitivity. When other performances are similar, the less the type of cross-interference gas, the lower the cross-interference sensitivity, and the better the sensor.
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