QB2000N/T is a fixed ethylene oxidedetecting transmitter, with 4-20 mA or RS485 ModBus RTU output proportional to the ethylene oxideleakage concentrationwith original imported electro-chemical sensor. It monitors ethylene oxideleakage 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 ethylene oxideconcentration exceed the preset alarm point(threshold) it 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 for direct communication to DCS system, RS485 ModBusoutputfor central unit
• Relay output for connecting external device
• LCD display screen(LED display screen optional)
• Sensormodule(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℃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. The visual and audible alarm is optional.

Technical parameters:

1. Sensor type: original imported electro-chemical sensor for epoxy ethane
2. Range: 0-100ppm（0-20/50ppm optional）
3. The low alarm s est value: 10ppm. High alarm value s ested: 20ppm.
4. Resolution: 1ppm  Accuracy:<= + 3% F.S
5. Response time:T90<30s.
6. Working current:≤50 Ma
7. Output signal: 4 to 20mA standard signal(RS485 output optional)
8. Power supply to the detector terminals: 16～30V DC.
9. Ambient Parameter: Temperature:- 20℃~+60℃  Humidity: < 90%(without condensating)
10. Type of cable: 3 or 4 active wires screened between detector and centralized unit. 3×1.5mm2； 4*1.5mm2  external diameter ￠>=10mm
11. Transmition Distance:<=1000meter
12. Mounting Screw thread: G1/2.
13. Weight: 1200g.
14. Anti-explosion Class: Ex d IICT6Gb
15. Protection Class:IP66.

Note: 5.audible-visual alarm is optional.