The alarm value of carbon monoxide is divided into high alarm and low alarm. For the detection of industrial carbon monoxide, according to national standards, there are generally two alarm settings: one is the first-level alarm, and the alarm value is set to 30-50 ppm；; One is secondary alarm, and the alarm is set to 150-300ppm.

The low alarm value is 25% of the maximum range of 500ppm, that is, when the carbon monoxide gas concentration displayed on the detection display screen of the carbon monoxide alarm reaches or exceeds 125ppm, the carbon monoxide alarm will send out a low-frequency audible and visual alarm signal. The high alarm value is 50% of the maximum range of 500ppm, that is, when the concentration of carbon monoxide gas displayed on the detection display screen of the carbon monoxide alarm reaches or exceeds 250ppm, the carbon monoxide alarm will send out a high-frequency audible and visual alarm signal.

Carbon monoxide alarm is an intrinsically safe instrument, which can continuously detect the concentration of toxic, harmful, flammable and explosive gases in the working environment. Suitable for explosion protection, toxic gas leakage rescue, underground pipelines or mines, etc. , can effectively ensure the safety of workers from infringement, production equipment from loss. Suitable gases for carbon monoxide gas detector: combustible gas, toxic gas and oxygen. Carbon monoxide alarms are widely used in metallurgy, power plants, chemicals, mines, tunnels, tunnels, underground pipelines and other places to effectively prevent poisoning accidents. It is convenient to connect with various DCS, PLC and other systems, with high protection level, strong dustproof, waterproof and corrosion resistance, and can work in acidic and alkaline environments.