fixed oxygen detecting transmitter provides 4-20 mA output and RS485 ModBus RTU output proportional to the oxygen concentration with electrochemical sensor, which is flexible, durable, swift and etc. and can be directly connected with DCS systems. It has been widely used in petrol, chemistry, metallurgy, artifice, gas transportation, biological medicine and water procession etc to test multi-gas, such as flammable gas and toxic gas O2,H2S,CO,HCN,NO2,SO2,NH3,HCL,CL2,H2. Characteristics: Sensor types: electrochemical sensor 4-20mA analog output(3+ channel) for direct communication to DCS system and RS485 ModBus output Sensor module design on -spot replacement s and automatically distinguish sensor fault and current display fault simultaneously. LED Display(LCD optional) Password verification for repeat operation, avoid fault operations. -40~+70℃following compensation for accurate detecting. Second grade visual alarms on-site and Relay(connected with audible/visual alarms or drive exhaust device). User-selectable alarm setpoint(s). Environment Parameter Environment temperature:-20℃~+60℃ Relative humidity ≤90%R.H. Technical Parameters Working voltage: 16~30VDC Working current: QB-01T is 120mA, others ≤50 mA Output signal: 4~20mA standard signal two wire type output (QB-01T three wire type) Sensor electrochemical sensor; QB-01T is catalytic combustion type Respond Time T90 less than 30 seconds Exterior Structure Weight ≤900g Fixing Parameters Fixing type: wall-mounted type Transition cable: two core shield cable (QB-01T uses three core shield cable), section 2×1.5mm2, external diameterĀ10mm Transferring distant ≤1000m Anti-explosion Class Exd IICT6(used for explosion proofing);ExiaIICT4(used for intrinsic safety type) Protection Class IP66