Acceptance error: Test with high-concentration gas: After the customer installs the combustible gas detector on site, he uses a lighter to test whether the detector works normally. After the ventilation test, the detector alarms but cannot be reset to zero. In normal use, after the sensor is detected to be damaged, all return to the factory to pay for the replacement.

Analysis: Many customers prefer to use high concentration gas for testing during acceptance. This method is very inaccurate and can easily cause damage to the instrument. The detection range of the combustible gas detector is {{0}}~100 percent LEL, the lower explosion limit is low (methane is 0~5 percent vol), and the lighter gas is high-purity butane, which is far beyond the detection range.

Test error: When using a lighter gas for testing, the sensor will be impacted 2 to 3 times or more, and the chemical activity of the sensing element will decay or deactivate in advance, resulting in a decrease in detection. The platinum wire was blown and the sensor was scrapped. It should be noted that the manufacturer cannot guarantee the failure of the sensor caused by the impact of high-concentration gas, and it needs to be replaced at its own expense.