Sales of gas detectors and sensors:

portable and fixed gas detector for the detection of toxic gases (poison gas), corrosive, flammable, harmful and oxygen for use in industrial and laboratory safety and protection (laboratory)

KQ series Fixed gas detector (also called gas sensor or gas transmitter). It can detect various gases such as flammable gas, O2、H2S、CO、HCN、NO2、SO2、NH3、HCL、CL2、H2 etc. Detector works 365 days.
with years of experience in designing and producing detector, we develop our new product with electrochemical sensor. It can be widely used in metallurgy, petrol, petrifaction, chemistry, light industry, coking, municipal administration, gas, pharmacy, sewage dealing and many other special industries and fields.  The device adopts intrinsic safety type channel design, standard 4~20mA two wires signal output. It can transfer data in long distance, can get into the DSC system directly. The detector has high sensitivity, quick response, long lifetime, polarization time and many other characteristics; it is among the first class in similar products in Germany.

Main features:

l It can detect more kinds of gas. high precision

l Fixed explosion-proof shell; it’s safe and reliable

l Standard 4-20mA electric current output, compatible with existing alarm control unit or DSC (distributed control system).

l Imported sensor, high sensitivity, rapid response, stable and reliable

l operation is simple; easy installation and maintenance




Technical parameters


Detecting Gas combustible gas, toxic gas, oxygen
Working Temperature toxic gas: - 20  ~ + 50  
Combustible gas: - 40  ~ + 70 
Relative Humidity ≤90%.. no condensation
Technical Parameters Working voltage: 1630VDC
Working current: KQ500-EX is 120mA, others ≤50 mA
Output signal: 420mA standard signal two wire type output 
(KQ500-EX three wire type)
Sensor electrochemical sensor; 
catalytic combustion type sensor for KQ500-EX
Respond Time T90<30s
Weight  ≤900g
Fixing Parameters Fixing type: wall-mounted type
Transition cable: two core shield cable 
(KQ500-EX uses three core shield cable),
section 2×1.5mm2, external diameter 10mm
Transmission distance  ≤1000m
Explosion-proof Level Exd IICT6(used for explosion proofing detector)
ExiaIICT4(used for intrinsic safety type detector)
Protection Class IP66

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 

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