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What is a gas detector calibration?
Nov 01, 2018

Whether it is a toxic gas detector or a combustible gas detector, it will have an alarm function, mainly in order to detect the environment when the target gas concentration reaches a certain concentration, the gas detector can issue alarm reminders.

The accuracy of the test results of an instrument is an important condition for the correct alarm, and the calibration of the gas detector is an important guarantee that the condition can be achieved. Gas detector calibration refers to the instrument in the corresponding known concentration of the test gas, compared with the gas detector test results and gas concentration to know the accuracy of the gas detector. For example, N-hexane in the 1.1%vol will burn explosion, and in the hexane detector set 10% alarm, hexane concentration reached 0.1% when the alarm, for the catalytic combustion sensor, this concentration is quite low.

The alarm value of the poisonous gas is much lower than the combustible gas, and the threshold alarm value is only 0.5ppm for chlorine. The measured results of the re-calibrated gas detector and the measured gas concentration are not more than 10%, then the instrument can be used without correction. For example, a ammonia detector to detect 50ppm of standard ammonia gas, if the instrument measurement results of 46ppm, then you can think of this ammonia detector test accuracy qualified without re-calibration, because 46ppm is between the results of 50±10%x50 45~55ppm.

Similarly, if this ammonia detector test results are 44ppm, then this detector needs to be re-calibrated to use. The calibration of the gas detector is an important way to detect the sensitivity of the instrument and to restore the accuracy of the instrument, and through testing and calibration we can also determine whether the sensor has failed. Therefore, it is necessary to calibrate the instrument regularly.

And the general calibration is very simple and convenient process, only two steps: first, the instrument with no gas to be measured in the "air" zero, two, the instrument is placed in a standard gas containing known concentrations for correction. For the safety industry's small partners, the portable detector must be accurate, reliable, not the slightest careless. The correct and regular calibration of the maintenance tester is an essential method, which shows how important the calibration is.

In fact, both the manufacturer of the detector or the national regulations have a calibration requirements, usually divided into two categories:

Equipment manufacturers require regular calibration, the general calibration within 2-6 months, to ensure that the instrument can work properly and effectively, manufacturers recommend that qualified users, dealers or manufacturers authorized service personnel can be calibration of the instrument. The Metrological regulations require that the number of calibrations should not be less than once every December, and this calibration must be carried out in the state-mandated metrology department, which means that calibration is required in the third-party metrology Institute.

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