The gas alarm is also the gas leakage detection and alarm instrument. When flammable or toxic gas leaks in the industrial environment, and the gas alarm detects that the gas concentration reaches the critical value set by the explosion or poisoning alarm, the alarm will send out an alarm signal to remind the work to take safety precautions, and drive the exhaust, cut-off and spray systems to avoid explosion, fire and poisoning accidents, so as to ensure safe production.

Gas alarm is divided into domestic gas alarm and industrial gas alarm. The household gas alarm mainly detects formaldehyde concentration, gas leakage and natural gas leakage. Industrial gas alarm is used to detect ammonia, nitrogen dioxide and other industrial harmful gases. It is composed of alarm controller and detector. The controller can be placed in the duty room, mainly to control the monitoring points. The detector is installed in the place where the gas is most likely to leak. Its core component is the built-in gas sensor, which detects the gas concentration value in the air.

While China is gradually entering industrialization, China's industrial accidents occur frequently every year. Such news reports as coal mine explosion, workshop fire and worker poisoning are endless. Such accidents are mainly caused by improper use of flammable, explosive, toxic and harmful gases in industrial environment. For this matter, the Chinese government has continuously introduced relevant laws and regulations (for example, gas alarms must be installed in specific environments) to prevent industrial accidents