How to calibrate a hydrogen gas detector?
Within 30 minutes before monitoring work in confined spaces, gas sampling and analysis should be conducted in the confined space. Only after passing the analysis can entry be allowed. Analytical instruments should be within their calibration period and ensure that they are in normal working condition before use. Sampling points should be representative, and for confined spaces with large volumes, samples should be taken from the upper, middle, and lower parts.
(1) In principle, standard sample gases that have been certified by metrology and match the gas being tested should be selected. The alarm points vary depending on the standard sample gas selected for the same tested medium.
(2) Before verification, the surrounding environment of the probe should be free of flammable gases. Assuming there is combustible gas, the rain cover should be removed first, and a certain amount of clean air should be filled before connecting the sample gas to ensure the accuracy of the verification.
(3) When the tested gas is a mixture of hydrocarbons, isobutane is the sample 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 moment, it is necessary to convert and adjust the range of the alarm based on certain detection signals.
The calibration of a gas alarm is a precision test to determine if the alarm is still functioning properly. Calibration and maintenance are the same, and both require regular and timely implementation to ensure that the alarm is always in a useful and accurate working condition. It can also be tested for its sensitivity and responsiveness. Combustible gas alarm is a gas leak detection and alarm instrument commonly used in chemical plants, oil and gas stations, metallurgical plants and other places where gas leaks can occur. As we all know, high-density combustible gases exist in these areas, so the calibration of the alarm requires more careful and rigorous inspection.
