Combustible gas alarms are widely used in industries such as metallurgy, petroleum, chemical industry, coal, municipal gas, storage, transportation, hotels and restaurants, and fire departments, and are gradually used in home fire prevention. It mainly measures the concentration of combustible gas in the ambient air. When the concentration of combustible gas in the air reaches a certain amount, the alarm will automatically alarm, and then exhaust or make the stop valve respond, which plays a role in preventing fire and poisoning accidents. The \"Measurement Law of the People\'s Republic of China\" and the \"Management Measures for Compulsory Verification of Working Measuring Instruments of the People\'s Republic of China\" stipulate that combustible gas detection alarms are compulsory verification measuring instruments and must be included in the scope of compulsory management in accordance with the law, and compulsory verification at fixed points and periods must be implemented. The verification period shall not exceed one year.
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