Sentry Industries 5000 Combustible GAS Scaling Factors, GAS Methane Propane Factor

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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