Why gas detectors need to be calibrated and verified on a regular basis
1. In principle, the calibration of combustible gas detectors should use standard gases that have been certified and matched with the detected gas.
2. Before calibrating the combustible gas detector, it should be ensured that the surrounding environment of the combustible gas detector is free of combustible gases. If there is combustible gas, the rain cover should be removed first, and a certain amount of clean air should be filled before continuously introducing the sample gas to ensure the accuracy of the verification.
3. When the tested gas is a mixture of hydrocarbons, isobutane is the selected gas, followed by propane.
4. For hydrocarbon mixtures with significantly different heat generated during combustion of non hydrocarbon mixtures or gases with lower explosive limits, readily available and stable single component fuels such as butane, isobutane, propane, etc. can be used as sample gases when necessary. At this point, the range of the alarm must be adjusted based on a certain detection signal conversion relationship.
Common gas detectors include portable gas detectors, four in one gas detectors, VOC detectors, etc. When you purchase a gas detector, the merchant will generally guide you on how to adjust the gas detector and remind you that the gas detector needs to be calibrated regularly. Why is this?
1. The accuracy of the instrument is an important prerequisite for issuing an alarm when the concentration of toxic or harmful gases or flammable gases in the detection environment reaches the preset alarm limit. Accurate and timely alarm is the guarantee for ensuring personnel safety and production safety.
2. The accuracy of the detector mainly depends on the sensor. Electrochemical sensors and catalytic combustion sensors will gradually change or even become toxic and ineffective due to the influence of certain substances in the environment during use. So regular calibration of gas detectors is completely necessary.
3. At present, all gas detectors have not yet freed themselves from the method of relative measurement, which is why the instruments need to be maintained and calibrated in a timely manner. Only by correctly calibrating according to the manufacturer's requirements can the accuracy of the results detected by the instruments be guaranteed.
4. Regular calibration is also necessary to ensure that the error of instrument detection results does not exceed the normal range. Just like our watches, we often calibrate them to the standard time to ensure the accuracy of the time displayed on the watch. For gas detectors whose detection results involve personnel safety, accuracy is even more important.
