Abstract: Based on the analysis of the frequent alarm problem of carbon monoxide alarms in the attached house of the analysis house, it is finally confirmed that the slight leakage interference of hydrogen gas causes the alarm of carbon monoxide alarms. Meanwhile, it also reminds us that the main disadvantage of electrochemical sensors is interference. Sensors will respond to multiple gases simultaneously. This requires us to pay attention to which gases may be present in the environment when selecting the type. The selection of sensors should be targeted to overcome interference from special gases by use of special effect sensors in order to avoid false alarms and improve on-site safety assurance.

Key words: combustible gas, toxic gas, gas alarm, interference