JJF 1421-2013 "Outline of Type Evaluation of Carbon Monoxide Detection Alarm" is applicable to carbon monoxide detection alarms used in non-mine operating environments. This outline refers to relevant standards such as JJG915-2008 "Carbon Monoxide Detection Alarm" and GB12358-2006 "General Technical Requirements for Gas detection alarms in the workplace". Carbon monoxide detection alarms are mainly used to monitor the concentration of carbon monoxide gas in the environment and ensure personal safety in the production process. When the gas concentration exceeds the set value, the instrument will issue an alarm signal. The instrument consists of Sensors, electronic components and display parts. Sensors convert the carbon monoxide concentration in the environment into electrical signals and display them after processing by electronic components. Sampling method is divided into diffusion and suction, according to the use of portable and fixed, to adapt to different working environments and needs.