... reporting the same time the shut-off Valve can cut gas sources 5 SECIFICATION:1, Power supply: AC220V ... %RH 10, Alarm density: Coal gas: 1000~5000ppm, Liquid petroleum gas: 1000~5000ppm, natural gas: 1000ppm~5000ppm11, Responding time: ≤ ... 30S12, Alarm output: frequent on or off signal, control exhaust fan, electrical magnetic valve ...