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SMC sierra monitor corporation Sentry Instruction Manual - Version 6

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

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.)

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