1. Is the ventilation environment good?
Flammable gas detectors should avoid verification when the gas concentration is higher than the lower explosive limit. Although this rarely happens, sometimes poor laboratory ventilation can lead to gas build-up and a sharp increase in gas concentration over a short period of time, which can have a large impact on instrument calibration verification results and safety.
For example, when the instrument calibrates a catalytic combustion combustible gas detector, the sensor used is the catalytically active element of the carrier. If the flammable gas concentration is higher than the lower explosive limit, the sensor will be "poisoned" seriously, and other components will be burned.
2. The combustible gas detector cannot be calibrated in places containing elements or compounds such as sulfur, arsenic, phosphorus, silicon, and aluminum.
Because these elements or their compounds will poison the sensor, reduce the sensitivity of the instrument, shorten the service life, and cause the instrument to fail in severe cases, and on-site maintenance will lead to the volatilization of some welding materials, adhesives, etc. Therefore, in a laboratory environment, on-site maintenance should be avoided.
