What should I do to calibrate and restore the gas alarm when data drift occurs?
1. Preparation of standard gases
Firstly, it is necessary to carefully select standard gases with precise concentration that meet national standards based on the detection target of the gas alarm. For example, if the alarm is used for methane detection, corresponding concentrations of methane standard gas need to be prepared.
2. Enter calibration mode
Different brands and models of gas alarms have their own ways of entering calibration mode. Some may be easily accessed through the combination of buttons on the instrument, while others require the help of accompanying software tools. For example, some portable alarm devices can start the calibration journey by long pressing specific function keys for a few seconds.
3. Zero point calibration
Connect the standard gas to the alarm and start the zero calibration procedure in a clean and target free environment. At this point, the alarm will intelligently recognize and record the background gas concentration in the current environment as a zero point reference, effectively eliminating the influence of external interference on the detection results.
4. Range calibration
Next, slowly introduce a standard gas of known concentration into the alarm at a specified flow rate. The alarm will compare the actual concentration of the incoming gas with its own detection value, and adjust the detection parameters through precise internal algorithms until the detection value perfectly matches the standard gas concentration. To ensure detection accuracy across the full range, it is usually necessary to calibrate multiple standard gases of different concentrations.
5. Verification of calibration results
After calibration is completed, different concentrations of standard gas are introduced again for verification testing. Observe whether the detection value of the alarm is closely close to the standard gas concentration. If the deviation is within the allowable range, it means that the calibration is successful; If the deviation exceeds expectations, it is necessary to re-examine the calibration steps or consider whether there is an instrument hardware malfunction.
