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The flammable gas detector uses the latest generation of low-power, high-interference-resistant carrier-catalyzed sensors. It forms a detection bridge with two fixed resistors. When the air contains flammable gas diffusing onto the surface of the detecting sensor, the flameless combustion is rapidly performed under the action of the catalyst on the surface of the sensor, and the reaction heat is generated to increase the resistance of the platinum wire of the sensor, and the detection bridge outputs a differential pressure signal. The magnitude of this voltage signal is proportional to the concentration of flammable gas. After being amplified, it performs voltage and current conversion and converts the percentage (% LEL) within the lower limit of the flammable gas explosion into a 4-20 mA standard signal output.
Gas to be measured
Molecular formula
Relative density
Explosion limit (VOL)
Ignition temperature (°C)
Methane
CH4
0.55
5% (below) -14.8% (on)
537
Toluene
C6H5CH3
3.2
1.1% (below) - 7.6% (on)
535
Methanol
CH3OH
1.11
5.5% (below) -38% (on)
385
Methyl formate
HCOOCH3
2.07
5% (bottom) -23% (on)
450
Ethyl formate
HCOOCH2CH3
2.65
2.7% (below) - 16.5% (on)
440
Methyl ether
CH3OCH3CH2
2.1
2% (below) -10.1% (on)
190
Ethane
CH3CH3
1.04
2.5% (below) - 15.5% (on)
515
Acetylene
CH=CH
0.9
2.3% (below) - 100% (on)
305
Ethanol
CH3CH2OH
1.59
3.1% (bottom) -19% (on)
363
Ethylbenzene
C6H5C2H5
3.66
1% (bottom) -7.8% (on)
431
Ethylene
C2H4
0.97
2.3% (below) -36% (on)
425
Methyl acetate
CH3COOCH3
2.56
3.2% (bottom)-16% (on)
502
Ethyl acetate
CH3COOCH2CH3
4.01
2.2% (below) -11% (on)
460
N-butyl acetate
CH3COO(CH2)3CH3
4.01
1.3% (bottom) - 7.5% (on)
370
Propane
CH3CH2CH3
1.56
1.7% (below) -10.9% (on)
470
Propanol
CH3CH2CH2OH
2.07
2.2% (below) - 17.5% (on)
405
Propylene
CH2=CHCH3
2
2% (below) -11% (on)
455
acetone
C3H6O
2
2.5% (bottom)-13% (on)
535
Butane
C4H10
2.05
1.4% (below) -9.3% (on)
372
Butanone
C4H8O
2.48
1.8% (bottom) -10% (on)
404
Butadiene
CH2=CH—CH=CH2
1.87
1.4% (below) - 16.3% (on)
430
Pentane
C5H12
2.48
1.8% (bottom) -10% (on)
404
Hexane
C6H14
2.97
1% (bottom) - 8.4% (on)
233
Heptane
C7H16
3.46
1.1% (below) - 6.7% (on)
215
Octane
C8H18
3.93
0.8% (bottom) - 6.5% (on)
206
Decane
C9H20
4.43
0.7% (bottom) - 5.6% (on)
205
Carbon monoxide
CO
0.97
10.9% (below) - 74% (on)
805
Ammonia
NH3
0.59
15% (below) -33.6% (on)
630
hydrogen
H2
0.07
4% (below) -7% (on)
560
benzene
C6H6
2.7
1.2% (below) - 8.6% (on)
560
Isobutane
C4H10
2
1.3% (below) - 9.8 (on)
460
Isopropanol
C3H8O
2.07
2% (below) -12.7% (on)
425
Cyclohexane
C6H12
2.9
1.2% (below) - 8.3% (on)
259
Cyclopentane
C5H10
2.4
1.4% (below)
320
Propylene oxide
C3H6O
2
1.9 (below) -37% (on)
430
Ethylene oxide
C2H4O
1.52
2.6% (bottom) - 100% (on)
435
Diethyl ether
C4H10O
2.55
1.7% (below) -36% (on)
160
Dimethyl ether
CH3OCH3
1.59
2.7% (bottom) -32% (on)
240
Xylene
C8H10
3.66
1% (bottom) - 7.6% (on)
464
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