This issue is crucial. The core reasons for the failure of gas analyzer sensor calibration are concentrated in three categories: calibration conditions, sensor status, and operation process, as follows:

1、 The calibration conditions do not meet the requirements

There are issues with standard gases, such as inaccurate concentration, expired gas, or impurities and excessive moisture.

The calibration environment is out of control, with temperature, humidity, and atmospheric pressure exceeding the allowable range for sensor calibration, affecting detection accuracy.

Leakage or blockage of gas pipelines, or adsorption of target gases by pipeline materials, resulting in inaccurate access of standard gases to sensors.

2、 Abnormal status of the sensor itself

Sensor aging and wear, such as electrolyte drying in electrochemical sensors, decreased activity in catalytic combustion sensors, and inability to respond properly to standard gases.

The sensor is contaminated, and oil stains, dust, or corrosive substances in the measured gas adhere to the surface of the sensor, affecting the detection sensitivity.

Loose sensor wiring and circuit faults result in abnormal signal transmission and inability to read calibration data properly.

3、 Operation and equipment setup issues

The calibration process is not standardized, such as direct span calibration without zero point calibration as required, insufficient calibration time, or improper gas flow rate.

Equipment parameter settings are incorrect, such as selecting the wrong calibration mode, mismatched range and standard gas concentration, or previous calibration data not being reset to zero.

Instrument hardware failures, such as motherboard and signal processing module abnormalities, result in calibration data being unable to be calculated and stored properly.