... Smoke Resistant Performance CA-386D Independent Carbon Monoxide Detector with Valve Features: Detection Gas: manufactured gas (hydrogen), natural gas, liquefied petroleum gas (LGP)Excellent sensor, stable and ... -386DAlarm Concentration:Hydrogen:125~750*10-6,Natural Gas:1-25%LEL,Liquefied Petroleum Gas:1~25%LELPower Supply:AC220V/50HZPower Monitoring ...