... for liquefied gas, butane, propane, methane, alcohol, hydrogen, smoke and detection.specificationsa. standard working conditionsB. Environmental conditionsC. Responsed. ... Bakelite (Black Bakelite) Detection Gas : Combustible gas and smoke Concentration : 300-10000ppm(Combustible gas) Circuit:1.Loop Voltage ... /R3000ppm CH4) Condition 1.Tem. Humidity 20°C±2°C;65%±5%RH 2.Standard test circuit Vc: ...