(1) Testing refers to using a gas detector to detect gases of known concentrations to determine whether the results detected by the instrument are within an acceptable range. If they exceed the allowable range, the instrument needs to be recalibrated.

(2) Calibration refers to adjusting the results of a gas detector with a known concentration of gas to match the concentration of the known gas.

(1) If conditions permit, the gas detector should be tested once a day before use;

(2) For gas detectors that fail the test, they must be calibrated before use;

(3) If the tested environment may have an impact on the performance of the gas detector, then testing should be conducted at any time.

(1) At least 10 days of testing were conducted on specific occasions, and daily testing results confirmed that the gas detector was not affected by certain gases in the environment, resulting in gas sensor poisoning.

(2) If it is determined after testing that the gas detector does not require calibration, the calibration interval can be extended, but it cannot exceed 30 days.

(3) The calibration history of the instrument should be managed by a dedicated person or have detailed tracking and usage record data files.