... into the pump suction)2, LCD digital display3, sound, light, vibration alarm at the same4 DC3.6V ~ 4.5V battery supply ... : ≤ ± 5% (F.S)8, Alarm mode: sound, light, vibration alarm9, response time: ≤ 40s10, sensor life: ≥ 2 years11, use of the environment: Temperature ... , metallurgy security ring, Chemical Services and other occasions Combustible Gas Detector