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Specifications

KB-501X Online Gas detector uses high performance Catalytic Combustion or Electrochemical gas sensor and microcontroller and employs SMD technology. It has good repeatability,high resistance to humidity-temperature jamming, long performance life and simple operation.
KB-501X can translate the detected gas concentration signals into digital signals for display. Three-wire system 4~20mA electric current signals output, with long-distance transmission and good anti-interference capacity.
KB501X is applied to gas safety inspection and alert for industrial working place, such  as  Petroleum Refinery, Chemical Plants, LPG stations, Boiler Rooms, Gas Stations, Paint Spray Booths, etc. 
Features
1. Advanced Catalytic Combustion or Electrochemical sensor; Cast Aluminium housing/ shell
2. Intrinsically safety circuit design;
3. High brightness LED digital display, clear and direct;
4. Three-wire system 4~20mA standard signals output;
5. Possible to connect to DCS system directly;
6. Two-stage (low/high) alarm double switching value output;
7. The probe has following advantages: high sensitivity, quick-response capacity, long performance life and short polarization time.
8. Function of infrared remote control operation (remote-control is optional units).

Technical Specifications for KB-501X Combustible / Toxic / O2 Gas Detector 
Gas 1. Combustible/Flammable/Explosive gas
Detecting Range 0~100% LEL
Alarm Threshold  (two-stage) Low: 25% LEL / High: 50% LEL
Gas 2. Toxic/Harmful/Poisonous/Hazardous gas
Detecting Range Refer to the gas parameter list
Alarm Threshold Refer to the gas parameter list
Gas 3. Oxygen (O2)
Detecting Range 0~30.0% vol
Alarm Threshold  (Two-stage) Low: 18.5% vol  High: 23.5% vol
Sensor Type Catalytic Combustion sensor(Combustible gas);  Electrochemical sensor(Toxic and Oxygen)
Display High brightness LED display
Working Environment Temperature: -20~55°C   Humidity: ≤95%RH (non-condensing)
Working Current ≤170mA(Combustible gas);  ≤50mA(Toxic and Oxygen)
Working Voltage 16~30 VDC
Output Signals  Three-wire system 4~20mA standard signals output
Power Consumption <3W(Combustible gas);  <1 W(Toxic and Oxygen)
Alarm Output Two-way electrical relay tip output (30V 2A)
Installation Means Wall mounted
Transmission Distance ≤1000m
Explosion-proof Type Explosion insulating
Explosion-proof Index Ex d IIC T6
Protection Grade IP65
Product Dimensions 140x179x86mm
Product Weight 1.39Kg
Remarks: The detecting range and alarm threshold value can be adjusted according to customer's request.