... , easy operation 2.Compact design, easy carrying BX616 Multi-gas Detector:1.Full functions, easy operation2.Compact design, ... explosion-proofGas sampling method Natural diffusion Gas sensor type Catalytic and electrochemical Detecting gas Combustible gas, H2S, CO, O2 Accuracy ... (without alarming) Gas Sensor Life 2 years Explosion-proof grade Ex ibd IICT3 Protection Grade IP65 BX616 Multi-gas Detector