Combustible GAS Scaling Factors

Instruction Manual

COMBUSTIBLE GAS SCALING FACTORS

For combustible gas monitoring, a calibration standard of Methane or Propane my be used in conjunction with scaling factors to cause alarm function in %LEL scale of another gas as follows:

G A S	METHANE	PROPANE
	FACTOR	FACTOR
Acetaldehyde	6 0	1 0 9
Acetic Acid	5 4	9 8
Acetic Anhydride	4 6	8 3
Acetone	5 2	9 4
Acetylene	5 7	103
Alkyl Alcohol	5 1	9 2
Ammonia	126	229
n-Amyl Alcohol	3 3	5 9
Aniline	3 9	7 1
Benzene	4 1	7 4
Biphenyl	2 5	4 5
1,3-Butadiene	5 6	101
n-Butane	5 8	106
iso-Butane	5 2	9 4
Butene-1	4 5	8 2
cis-Butene-2	4 8	8 8
trans-Butene-2	5 1	9 2
n-Butyl Alcohol	3 4	6 2
iso-Butyl Alcohol	5 3	9 6
tert-Butyl-Alcohol	7 4	134
n-Butyl Benzene	3 1	5 7
iso-Butyl Benzene	3 2	5 8
n-Butyric Acid	3 8	6 9
Carbon Disulfide	1 8	3 2
Carbon Monoxide	7 5	137
Carbon Oxysulphide	9 3	169
Chlorobenzene	3 4	6 2
Cyanogen	8 9	162
Cyclohexane	4 1	7 4
Cyclopropane	6 2	113
n-Decane	3 3	5 9
Diethylamine	4 9	8 8
Dimethylamine	5 8	105
2,3-Dimethylpentane	4 0	7 2
2,3-Dimethylpropane	4 0	7 2
Dimethylsulphide	4 3	7 9
1,4-Dioxane	4 5	8 1
Epichlorohydrin	4 5	8 2
Ethane	6 8	123
Ethyl Acetate	5 1	9 3
Ethyl Alcohol	7 3	132
Ethylamine	5 3	9 5
Ethyl Benzene	3 6	6 5
Ethyl Bromide	9 1	165
Ethyl Chloride	5 7	103
Ethylcyclopentane	4 0	7 2
Ethylene	7 1	128
Ethylenedichloride	6 6	120
Ethyleneoxide	5 2	9 4

G A S	METHANE	PROPANE
	FACTOR	FACTOR
Diethyl Ether	4 6	8 4
Dimethoxyethane	4 2	7 5
Dimethyl Ether	6 3	113
Dimethylformamide	4 6	8 3
Ethyl Formate	4 4	8 0
Ethylmercaptan	5 6	102
n-Heptane	3 9	7 0
n-Hexane	3 7	6 7
Hydrazine	4 5	8 2
Hydrogencyanide	4 8	8 6
Hydrogen	7 7	139
Hydrogen Sulfide	4 1	7 4
Methane	100	181
Methyl Actetate	5 0	9 0
Methyl Alcohol	8 6	156
Methylamine	7 7	140
Methyl Bromide	9 0	162
Methyl Chloride	102	186
Methylcyclohexane	4 4	8 0
Methylenedichloride	9 3	168
Methylethylether	4 4	8 0
Methylethylketone	4 1	7 5
Methyl Formate	6 7	121
Methylmercaptan	6 1	110
Methylpropionate	5 1	9 3
Methyl n-propylketone	4 0	7 3
Napthalene	3 4	6 2
Nitromethane	3 4	6 2
n-Nonane	3 1	5 7
n-Octane	3 7	6 8
n-Pentane	4 6	8 3
i-Pentane	4 6	8 4
Propane	5 5	100
n-Propyl Alcohol	4 7	8 5
n-Propylamine	4 8	8 8
n-Propylchloride	5 0	9 0
Propylene	5 2	9 3
Propyleneoxide	4 6	8 3
iso-Propylether	4 4	7 9
Propyne	4 2	7 5
Toluene	4 0	7 3
Triethylamine	4 0	7 2
Trimethylamine	4 8	8 8
Vinylethylether	4 2	7 6
o-Xylene	3 6	6 5
m-Xylene	3 9	7 1
p-Xylene	3 9	7 1
JP-4 (Jet Fuel)	4 1	7 3

NOTES:

1.Scaling factors are not FMRC approved.

2.	Base data source: EEV sensor specification catalog. (EEV claims some data is the result of specific	tests,
	other data is empirically derived.)
3.	Display = Cal Gas / Factor = % LEL
	=> must be less than 1

TABLE 1

Page: 16

Model 4105 Gas Sensor Module (12/02)