fixed combustible gas detector

Specifications Sensor module block design.Simple operation,flexible & diversified output signal.Economic & Efficient.Succession, short delivery

QB2000T-01 is a fixed combustible gas detector , with 4-20 mA or RS485 ModBus RTU output proportional to combustible gas leakage concentration with original imported catalytic combustion sensor. The fixed combustible gas detector monitors combustible gas leakage by natural diffusion. It is flexible, durable, accuracy, stable and etc. and it can be directly connected with DCS systems or Central unit. With relay output, once the concentration exceed the preset alarm point(threshold) the fixed combustible gas detector will start the acoustic-optical alarm on the central unit and drive the external equipment like exhaust fans.It has been widely used in petrol, chemistry, metallurgy, artifice, gas transportation, biological medicine and water procession etc.    Characteristics:  4-20mA analog output(3+ channel) for direct communication to DCS system,  RS485 ModBus output for central unit  Relay output for connecting external device  Sensor module(block) design on -spot replacement s and automatically distinguish sensor fault and current display fault simultaneously.  Password verification for repeat operation, avoid fault operations.  -40~+70°C 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).  Note: QB2000N is with the digital display screen but QB2000T is without the digital display screen.   Technical parameters: Sensor type: original imported catalytic combustion sensor for combustible gas.  Range:0-100%LEL  Resolution: 1%LEL Accuracy:<= + 3% F.S Response time:T90<30s. Working current:≤50 Ma Output signal: 4 to 20mA standard signal(RS485 output optional)  Power supply to the detector terminals: 16~30V DC.  Ambient Parameter: Temperature:-20°C~+60°C.  Humidity: < 90%(without condensating) Type of cable: 3 or 4 active wires screened between detector and centralized unit. 3×1.5mm2  for 4-20mA signal OR 4*1.5mm2 for RS485 signal, external diameter: >=10mm Transmition Distance:<=1000meter Mounting Screw thread: G1/2. Weight:1200g. Anti-explosion Class: Ex d IICT6Gb  Protection Class:IP66.