... in wide range, 2. High sensitivity to Propane, Butane and LPG, 3. Long life and low cost, 4. Simple drive ... (Black Bakelite)Detection GasIsobutane, Butane, LPGConcentration300-10000ppm( Butane, Propane, LPG)CircuitLoop VoltageVc≤24V DCHeater VoltageVH5.0V±0.2V AC or ... (in air)/Rs(1000ppm C4H10)≥5Slopeα≤0.6( R2000ppm/R1000ppm LPG )ConditionTem. Humidity20°C±2°C, 65%±5%RHStandard test ...