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Your position:Home> ProductsKQ500T Fixed Gas Detector


KQ500T series fixed gas detector is also called gas sensor.It transforms the gas density in the operating site into RS485. With LED display, detector's sensor can be changed and reused as soon as it is connected to electricity.

KQ500D detector has excellent performance, stable operation, easy maintenance. detector can detect various gas, it meet various requirements in the operation site; it has been widely used in petrol, chemistry, metallurgy, artifice, gas transportation, biological medicine and water procession etc.

Main features:

l RS485 output.

l LED site display that is suitable for factory

l Standard three buttons: so an individual can operate the detector on site.

l Automatic identify and display the sensor failures, and output the corresponded current signal at the same time.

l The key operation needs to input password to prevent wrong operation.

l Simple calibration function; reducing measuring error

l Two levels' light alarm, relay output (connected with audible and visual alarm outside or start the exhaust system)

Technical parameters

Detecting Gas combustible gas, toxic gas, oxygen
Measuring Range see the chart
Working Voltage 24VDC±15%
Working Temperature toxic gas: - 20  ~ + 50   
Combustible gas: - 40  ~ + 70 
Working Humidity 10-90% R.H.(no condensation)
Signal output RS485 signal output
Sensor type Catalytic combustion; electrochemical sensor
Deviation ≤± 3% F.S
Respond Time T90 < 30 s 
Display model LED display
pressure range 80-120KPa
Electrical interface M20 x 1.5 mm
Explosion-proof level Exd IICT6(used for explosion proofing detector)
Protection Class IP66
Transition cable four core shield cable RVVP 4×1.0mm2; 4×1.5mm2 
Transmission distance ≤1200m
Weight 160mm(L)*140mm(W)*85mm(H) about 1.5kg
Shell material

precision casting aluminum shell, antirot material; 

Sensor parts uses 304 stainless steel; 

Dust screen uses 316 stainless steel

Product Information Chart

Product Model Detected Gas Measuring Range  Resolution  Respond Time (T90) Sensor Life
KQ500T-O2 O2 030%vol 0.1%vol ≤15s 2-3y
KQ500T-CO CO 01000ppm 1 ppm ≤15s 2-3y
KQ500T-H2S H2S 0100ppm 1 ppm ≤15s 2-3y
KQ500T-HCN HCN 020ppm 0.1 ppm ≤30s 2-3y
KQ500T-CL2 CL2 020ppm 0.1 ppm ≤30s 2-3y
KQ500T-O3 O3



0.1 ppm


≤25s 2-3y
KQ500T-NH3 NH3 0100ppm 1 ppm ≤30s 2-3y
KQ500T-H2 H2 01000ppm 1 ppm ≤30s 2-3y
KQ500T-NO2 NO2 020ppm 0.1 ppm ≤25s 2-3y
KQ500T-PH3 PH3 0-20ppm 0.1 ppm ≤15s 2-3y
KQ500T-C3H3N C3H3N 0-100ppm 1ppm ≤30s 2-3y
KQ500T-NO NO 0-250ppm 1ppm ≤25s 2-3y
KQ500T-HCL HCL 0-20ppm 0.1ppm ≤25s 2-3y
KQ500T-SO2 SO2 020ppm 0.1ppm ≤15s 2-3y
KQ500T-EX Combustible gas 0-100%LEL 1%LEL ≤30s 3-5y
KQ-CO2 CO2 0-5000ppm 1ppm ≤30s 5y
0-5.00%vol 0.01%vol ≤30s 5y
As for unlisted detected gas and measuring range, please contact with our company 

Related products                                                                                                                             


KQ500D Fixed Gas Detector        KQ500 Gas Alarm System            KQ500N Gas Alarm System