LEL Sensors

$ 1,245.00$ 1,345.00

Product Features:

  1.   Natural diffusion, LCD display
  2.   Max 4 gases can be detected at the same time;
  3.   Waterproof and dust-proof;
  4.   Infrared remote control, imported sensors;
  5.   Have strong anti-jamming capability;
  6.   O2, CO2, CO, NO, NO2, SO2, H2S, LEL, O3, NH3, PH3, etc., gases can be customized;
  7.   English user manual, panel and display are available;
  8.   Aluminum shell material with high strength, heat resistance and corrosion resistance.


SRS develops and manufacture many kinds of Fixed LEL Sensors / gas alarm detectors, based on signal out:  4-20mA, RS485 and RS232; based on the display, have LCD, LED and no display.

Which kind should be choose?  It depends on the gas detected, the working environment and the terminal equipment.

LEL Sensors









Application Installation Cases


Additionally, fixed multi gas detector or LEL Sensors are suitable for the detect concentration of poisonous and harmful, inflammable and explosive gas in the air.  Moreover, It is widely used in metallurgy, Garbage Dump, Leather Factory, power plant and chemical industry.  In addition, it is also used in coal mines, oil mines, on farms, warehouse, tunnels, underground pipeline and other places.  It is effectively reminding and preventing the happening of the accident.


Uses in Parking lot: 


To detect CO gas concentration in the garage, controller will send an alarm signal quickly when the concentration too high.


Applications in the Kitchen: 


Furthermore, Home Kitchen, Restaurant Kitchen, Hotel kitchen and many other place use our gas transmitter to detect the natural gas leak precisely.


Uses in Tunnel: 


Finally, to detect toxic and harmful gases in tunnel, realize real-time data transmission, computer monitoring and alarm quickly.


Not what you are looking for?  Other Products Click Here!

Additional information

Weight 8 lbs
Dimensions 16 × 12 × 12 in
Gas Measured

EX, O2, N2, C02, H2S, CO, NO, NO2, SO2, CL2, H2, NH3, PH3, HCL, O3, CH20, HF, VOC, ETO, C6H6

Connection Type

NONE, NPT, Flanged, Sanitary


4-20MA, 0-10VDC



Output Way

2-Wire, 3-Wire


Product parameters

Name Parameters
Product name CE, ATEX Fixed LCD multi LEL CO, H2S, O2 sensor, 4 gases detector
Size 142mm *178.5mm * 91mm
Weight about 1350g
Sensor types electrochemistry, catalytic combustion type
Destination gas O2, EX, CO, H2S, other poisonous and harmful gases also can  be combined
Measure range and precision LEL:0-100%lel  1%lel

O2:0-30%vol   0.%vol

CO:0-2000ppm 1ppm

H2S:0-200ppm 1ppm

Response time ≤30s(O2);≤40s(CO,H2S);≤20s(EX)
Working pattern continuous work
Working voltage DC24V
Output signal 4-20mA (RS485 digital signal is optianal)
Display LCD display
Output way two wire or three wire, three wire system can output a set of relay switch signal
Additional feature Time, calender display,can save 3000+ alarm records.
Temperature range – 20 ℃ ~ 50 ℃
Humidity 15% ~ 90% RH (No condensation)
Explosion-proof number CE10 1084
Explosion-proof marks Exd II CT6
Control signal Switch output, the maximum load 250 V AC 3A(optional)
Connection mode according to the instruction
Transmission distance < 1000 m



SRS-FCX-LEL Sensor Manual


Gas Parameters

Detected gas Measure Range Resolution Alarm point Alarm point
EX 0-100%lel 1%lel 25%lel 50%lel
O2 0-30%vol 0.1%vol <18%vol >23%vol
N2 70-100%vol 0.1%vol >82%vol <90%vol
CO2 0-5%vol 0.01%vol 0.2%vol 0.5%vol
CO2 0-50000ppm 1ppm 2000ppm 5000ppm
H2S 0-200ppm 1ppm 5ppm  10ppm
CO 0-2000ppm 1ppm 50ppm 150ppm
NO 0-250ppm 1ppm 10ppm 20ppm
NO2 0-20ppm 1ppm 5ppm 10ppm
SO2 0-100ppm 1ppm 5ppm 10ppm
CL2 0-20ppm 1ppm 2ppm 4ppm
H2 0-1000ppm 1ppm 35ppm 70ppm
NH3 0-200ppm 1ppm 35ppm 70ppm
PH3 0-20ppm 1ppm 10ppm 20ppm
HCL 0-20ppm 1ppm 2ppm 4ppm
O3 0-50ppm 1ppm 2ppm 4ppm
CH2O 0-100ppm 1ppm 5ppm 10ppm
HF 0-10ppm 1ppm 5ppm 10ppm
VOC 0-100ppm 1ppm 10ppm 20ppm
ETO 0-100ppm 1ppm 10ppm 20ppm
C6H6 0-100ppm 1ppm 5ppm 10ppm



There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.