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SMC sierra monitor corporation Sentry Instruction Manual - Version 6
SERVICE
Page: 71
7.5.5 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 Sentry concentration display and alarm function in %LEL scale of another gas as follows:
GAS METHANE PROPANE
FACTOR FACTOR
Acetaldehyde 60 109
Acetic Acid 54 98
Acetic Anhydride 46 83
Acetone 52 94
Acetylene 57 103
Alkyl Alcohol 51 92
Ammonia 126 229
n-Amyl Alcohol 33 59
Aniline 39 71
Benzene 41 74
Biphenyl 25 45
1,3-Butadiene 56 101
n-Butane 58 106
iso-Butane 52 94
Butene-1 45 82
cis-Butene-2 48 88
trans-Butene-2 51 92
n-Butyl Alcohol 34 62
iso-Butyl Alcohol 53 96
tert-Butyl-Alcohol 74 134
n-Butyl Benzene 31 57
iso-Butyl Benzene 32 58
n-Butyric Acid 38 69
Carbon Disulfide 18 32
Carbon Monoxide 75 137
Carbon Oxysulphide 93 169
Chlorobenzene 34 62
Cyanogen 89 162
Cyclohexane 41 74
Cyclopropane 62 113
n-Decane 33 59
Diethylamine 49 88
Dimethylamine 58 105
2,3-Dimethylpentane 40 72
2,3-Dimethylpropane 40 72
Dimethylsulphide 43 79
1,4-Dioxane 45 81
Epichlorohydrin 45 82
Ethane 68 123
Ethyl Acetate 51 93
Ethyl Alcohol 73 132
Ethylamine 53 95
Ethyl Benzene 36 65
Ethyl Bromide 91 165
Ethyl Chloride 57 103
Ethylcyclopentane 40 72
Ethylene 71 128
Ethylenedichloride 66 120
Ethyleneoxide 52 94
GAS METHANE PROPANE
FACTOR FACTOR
Diethyl Ether 46 84
Dimethoxyethane 42 75
Dimethyl Ether 63 113
Dimethylformamide 46 83
Ethyl Formate 44 80
Ethylmercaptan 56 102
n-Heptane 39 70
n-Hexane 37 67
Hydrazine 45 82
Hydrogencyanide 48 86
Hydrogen 77 139
Hydrogen Sulfide 41 74
Methane 100 181
Methyl Actetate 50 90
Methyl Alcohol 86 156
Methylamine 77 140
Methyl Bromide 90 162
Methyl Chloride 102 186
Methylcyclohexane 44 80
Methylenedichloride 93 168
Methylethylether 44 80
Methylethylketone 41 75
Methyl Formate 67 121
Methylmercaptan 61 110
Methylpropionate 51 93
Methyl n-propylketone 40 73
Napthalene 34 62
Nitromethane 34 62
n-Nonane 31 57
n-Octane 37 68
n-Pentane 46 83
i-Pentane 46 84
Propane 55 100
n-Propyl Alcohol 47 85
n-Propylamine 48 88
n-Propylchloride 50 90
Propylene 52 93
Propyleneoxide 46 83
iso-Propylether 44 79
Propyne 42 75
Toluene 40 73
Triethylamine 40 72
Trimethylamine 48 88
Vinylethylether 42 76
o-Xylene 36 65
m-Xylene 39 71
p-Xylene 39 71
JP-4 (Jet Fuel) 41 73
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.)