1. Is the ventilation situation favorable?
If there are gas concentrations over the lower explosive limit, flammable gas detectors should not verify. Even though it doesn't often happen, inadequate laboratory ventilation can occasionally cause gas build-up and a rapid rise in gas concentration over a short period of time. This can have a significant impact on the accuracy and safety of instrument calibration verification results.
For instance, the sensor utilized for calibrating a catalytic combustion combustible gas detector is the carrier's catalytically active element. The sensor will be significantly "poisoned" and other components burned if the flammable gas concentration exceeds the lower explosive limit.
2. In locations that contain components or compounds like sulfur, arsenic, phosphorus, silicon, or aluminum, the flammable gas detector cannot be calibrated.
Due to the fact that these substances will poison the sensor, decrease the instrument's sensitivity, lower its lifespan, and, in extreme situations, result in the instrument failing, as well as the fact that on-site maintenance will cause some welding materials, adhesives, etc. to volatilize. Therefore, on-site maintenance should be avoided in a laboratory setting.
