Compulsory verification refers to the 1 method to test some physical quantities that have measurement effect but cannot be directly measured such as quality, length, volume and electricity quantity according to national laws and regulations. Strong inspection measuring instruments refer to the category of measuring instruments that require mandatory verification.

Combustible gas alarm as the 1 kind of safety monitoring equipment, its accuracy and reliability is directly related to people's life and property safety and social stability. Therefore, to some extent, the combustible gas alarm does have the characteristics of strong inspection measuring instruments. However, before 2020, combustible gas alarms are mandatory verification appliances, and the verification work is directly in the charge of government departments. However, since 2020, the mandatory verification of combustible gas alarms has been canceled.

Therefore, according to the provisions of relevant laws and regulations such as the the People's Republic of China Metrology Law and the Announcement on the Independent Management of Non-Forced Metrology Instruments Used by Enterprises in accordance with the Law, the combustible gas alarm used in production and operation is a non-intensive inspection safety work measuring instrument. However, in order to ensure the accuracy and reliability of combustible gas alarms, many local governments and industry organizations have formulated corresponding standards and specifications, requiring combustible gas alarms to undergo specific certification and testing before they can be put into use. These standards and specifications not only cover the design, manufacture, installation and use of combustible gas alarms, but also include strict requirements for their performance, stability, sensitivity and other indicators. In the process of using, enterprises need to carry out at least once a year to ensure the stable performance of combustible gas alarm.