The difference between gas and combustible gas alarm

    Gas alarm, usually refers to combustible gas or carbon monoxide. If it is a combustible gas alarm, the sensor is mostly based on the catalytic combustion principle, and if it is a carbon monoxide alarm, the sensor is based on the electrochemical principle. Domestic sensors are still to be improved, and imported sensors are still the first choice for gas detectors .

　　Combustible gas alarm, the composition of combustible gas is complex, generally refers to alkanes, such as carbon monoxide, hydrogen, etc. also belong to the category of combustible gas. The following introduces the hydrogen sensor

　　1. Hydrogen sensors cannot replace carbon monoxide sensors. The ratio of hydrogen to carbon monoxide varies greatly in gas from different sources; hydrogen diffuses much faster than carbon monoxide, so it is not easy to accumulate, while carbon monoxide is just the opposite. In the end, what we want to measure is carbon monoxide, not hydrogen.

　　2. Hydrogen sensors are not as effective as carbon monoxide sensors, have poor selectivity, and are not easy to ensure stability. In particular, hydrogen sensors are not easy to distinguish from alcohol sensors. Even if a newly prepared sensor achieves this function, it will lose this performance after working for a period of time. Currently available carbon monoxide sensors have excellent selectivity and can achieve almost no response to ethanol.

　　The carbon monoxide sensor works intermittently, while the hydrogen sensor is continuously powered and works continuously. The carbon monoxide sensor reacts strongly to cigarette smoke.