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What problems should be paid attention to when calibrating combustible gas detector?

Publication Date:2025/06/13

Combustible gas is the 1 kind of flammable and explosive gas. If it leaks, it is very dangerous. The combustible gas detector is a detector that responds to the concentration of single or multiple combustible gases. The combustible gas detector is installed in the workplace. When combustible gas leaks during the production process and the accumulated combustible gas concentration reaches or exceeds the explosion value, the concentration change of combustible gas in the air can be detected in time, and the danger can be transmitted to safety management personnel and field staff by sending out sound and light alarm signals. However, the combustible gas detector should be calibrated at least once a year according to regulations, and attention should be paid to the calibration environment and other related issues in the calibration to achieve better calibration results. Do you know what problems should be paid attention to when calibrating combustible gas detector ? The following is a brief introduction by Yiyuntian Electronics:


 combustible gas detector


The following issues should be noted when calibrating the combustible gas detector:


1. calibration environment

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Good ventilation is required.For the diffusion and escape of open combustible gas, if there is no good ventilation condition, it is easy to make the content of combustible gas in the air close to or reach the explosion limit concentration, which leads to inaccurate verification results. No interference with the measured components.


2. Calibration Flow Control


During the validation process, because most of the combustible gas detectors are catalytic combustion sensors, the flow directly affects the accuracy of the verification results. The alarm can maintain a high sensitivity within a certain flow range, too high or too low will have a greater impact on the sensitivity. When the flow rate is less than the measurement requirement, the original surface of the sensor cannot reach the true concentration, the combustible gas cannot be replenished in time after combustion, and the combustion cannot continue, so the sensitivity is very low.When the gas flow rate increases, the thermal effect increases accordingly, and the sensitivity increases gradually. When the gas flow rate continues to increase, the excessive flow will increase the heat dissipation of the component, but it will reduce the sensitivity. When the flow exceeds the measurement requirements, the accuracy is reduced. General instrument in the design, manufacturers have been through repeated tests to select the best gas flow.


Indication mismatch between master controller and field detector during 3. calibration


In general, the combustible gas detector is connected by the main controller and the detector in a branch system, detectors are distributed in multiple outlets. The main controller centrally controls multiple monitoring outlets. The gas concentration of each detector is independently displayed. When the gas concentration of the detector in the environment reaches or exceeds the preset alarm value, the main controller will issue an alarm to remind the personnel on duty to take safety measures to ensure safe production of the enterprise.


Calibration mask for 4. calibration

The calibration procedure stipulates that the diffuser must have a special calibration cover, each manufacturer has its own special calibration cover, but in actual calibration, the calibrator will be replaced by a self-sealing bag and a self-made calibration cover. It is best to use the original factory when calibrating, because the calibration response time includes the internal air and air intake mode of the instrument. The indication error of these two indicators still has a certain impact. Of course, in the calibration of the combustible gas detector, no matter what kind of calibration cover is used, the principle that the calibration cover cannot be too tight and the overflow port cannot generate positive pressure must be strictly observed, which will affect the calibration result. Strictly prohibit too loose, resulting in the entry of external gas, so that the actual value of the standard gas becomes smaller, affecting the verification results.


To sum up, we can see that with the continuous improvement of people's awareness of production safety, many factories, workshops and tank farms involving flammable and explosive gases will install combustible gas detectors, and relevant safety supervision departments will carry out inspections to ensure production safety.


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