KB-501 fixed gas detector uses high performance Catalytic Combustion or Electrochemical gas sensor and sophisticated SMD technology. It has good repeatability,high resistance to humidity-temperature jamming, long working life and easy to operate.

KB-501 can translate the target gas concentration signals into electric current signals or digital signals for outputting and transmitting. It adopted three-wire (4~20mA signals output) and four-wire (RS485 Bus output) system, remotely examine the detection result through the monitor or controller.

KB-501 is commonly used in gas safety inspection and alert for industrial workplace, such as Petroleum Refinery, Chemical Plants, LPG stations, Boiler Rooms, Gas Stations, Paint Spray Booths, etc.

Features of KB-501
1. Imported Catalytic Combustion or Electrochemical sensor;
2. Intrinsically safety circuit design;
3. Three-wire system 4~20mA standard signals output, long distance transmission;
4. RS485 bus output (optional);
5. Possible to connect to DCS system directly;
6. The probe has high sensitivity, quick-response capacity, long working life and short polarization time.

Technical Specifications

Technical Specifications for KB-501 Fixed Gas detector alarm 
Detectable Gas 1 Combustible/Flammable/Explosive gas
Detecting Range 0~100% LEL
Alarm Threshold  (two-stage) Low: 25% LEL / High: 50% LEL
Detectable Gas 2 Toxic/Harmful/Poisonous/Hazardous gas
Detecting Range Refer to the gas parameter list
Alarm Threshold Refer to the gas parameter list
Detectable Gas 3 Oxygen (O2)
Detecting Range 0~30.0% VOL
Alarm Threshold Low: 18.5% VOL  High: 23.5% VOL(can be adjusted)
Sensor Type: Catalytic Combustion sensor(Combustible gas);  Electrochemical sensor(Toxic and Oxygen)
Working Current: ≤170mA(Combustible gas);  ≤50mA(Toxic and Oxygen)
Working Voltage 16~30V DC
Output Signals: three-wire system 4~20mA standard signals output; RS485 bus output (optional)
Power Consumption: <2.2W(Combustible gas);  <0.5W(Toxic and Oxygen)
Installation Means: Wall mounted
Transmission Distance: ≤1000m
Explosion-proof Type: Explosion insulating
Explosion-proof Index: Ex d IIC T6
Protection Grade: IP65
Operating Environment: Temperature: -25°C~50°C    Humidity: ≤95%RH (non-condensing)
Remarks: The detecting range and alarm threshold value can be adjusted according to  customer's request.