... (which can increase pump into the pump suction)2, LCD digital display3, sound, light, vibration alarm at the same4 DC3.6V ... time: ≤ 40s10, sensor life: ≥ 2 years11, use of the environment: Temperature -15degree~ +45 degree; Relative Humidity: ≤ 95% RH12, Dimension: 115 × 55 ... , metallurgy security ring, Chemical Services and other occasions Combustible Gas Detector