... 0Xi'an Hua Fan Instrument Co.,Ltd is one of the leading single point of wall-mounted gas alarming detector manufacturers and ... product has widely used in detecting toxic and harmful gas or oxygen content detection in metallurgy, chemical industry, petroleum, pharmaceutical, ... type, special separately)Destination gas: oxygen (O2), gas (EX),Toxic or harmful gases (CO, H2S, NH3, CL2, etc.)Response time:≤ ...