How Often Should Gas Detectors be Calibrated and by Whom?

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Calibration frequency is one of the most commonly asked questions concerning the use of gas detection
instruments. Common factors to consider when deciding how frequently to calibrate are: type of sensor,
type of gas detector (fixed vs. portable), the required use and accuracy of the detector, manufacturer’s
recommendations, how confident you are about the functioning of your instrument (did you go through a
period of initial use in the intended atmosphere verifying accuracy on a daily basis, do you keep records
so you can quickly identify if a detector has a history of excessive maintenance, is prone to erratic
readings or needs to be replaced), whether bump testing is part of your maintenance regime (it should
be!) and whether you suspect there are environmental conditions or potential damage has occurred to
the instrument that could affect the instrument’s performance.

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