Catalytic combustion sensor principle of flammable gas alarm

October 04, 2021

For gas concentration alarms such as flammable gas alarms, due to technical reasons, the display data fluctuations are relatively large. Normally, calibration is required at least once a year. In addition to calibration, there is still a problem of drift. Combustible gas detectors are catalytic combustion type gas detectors, which are catalytic combustion type sensors. They contain substances inside the sensor and output relevant currents through reactions of substances and gases. Therefore, they are easily affected by acid etching, moisture, etc. Drift, mainly zero drift. The zero drift is divided into upward drift and downward drift, and downward drift is implicit drift, which cannot be viewed by the device.

We mainly talk about dominant drift, which can be seen intuitively. The dominant drift is zero drift up, the number is getting bigger, if you do not deal with it in time, it will produce false alarms. The error of the general gas concentration alarm is 5%, and the alarm point is generally about 20% of the full scale. We use flammable. Gas alarms as an example: If the drift number of flammable gas alarms is 5 or less, we can temporarily adjust or zero the host alarm directly. If it exceeds 5-10, we consider zeroing through the probe zero adjustment knob if it exceeds 10, professionals may need to check the zero and calibration.
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