In simple terms, the gas detectors take a fair amount of abuse each day used. From exposure to extreme temperatures and humidity, to “sensor poisoning” from the external contaminants such as grease, silicon, oil etc, or even the knocks and bumps, all of these can affect how accurately the sensor will detect gas.
Gas detection equipment is calibrated at least every six months for a reliable performance as this will ensure that your instrument will be working perfectly and avoid the sensor can’t accurately read the calibration gas. The calibration cycle can be extended for gas monitoring instruments that successfully pass the bump gas test prior to use.
The condition of a gas detector sensor would affected the gas detector performance. The typical life span of a gas detector sensor is usually between 2-3 years. The lifespan of a sensor depends on several factors like the technology used, environmental conditions and gas exposure. As well as calibrating the sensor to the correct response, instruments will have a calibration date set on the instrument, that you can see when calibration was performed and when it’s next due, as well as get a calibration certificate as a record.