Detcon FP-524D-HRT - Manual (Page 24)

Model FP-524D-HRT
FP-524D-HRT Instruction Manual Rev. 0.1 Page 20 of 48
strength of butane is 1.71 times lower than methane. The current setting can be viewed in View Program
Status – Gas Factor.
The following table shows the gas factors of most combustible gases that can be measured. Find the target gas
and enter the corresponding value as the gas factor. For example, if butane were the target gas, the correct gas
factor would be 1.71. If there is a mixture of target gases, use a weighted approach to determine the correct
gas factor. For example, if the target gas was 50% butane and 50% methane, the correct gas factor would be
calculated and entered as 0.5(1.71) + 0.5 (1.0) = 1.35.
Table 2 Gas/Cal Factors
Gas Factor Gas Factor Gas Factor
Acetaldehyde 1.66 Decane 3.05 Dimethyl Ether 1.60
Acetic Acid 1.84 Diethylamine 2.05 Methylethyl Ether 2.27
Acetic Anhydride 2.17 Dimethylamine 1.73 Methylethyl Ketone 2.42
Acetone 1.93 2,3-Dimethylpentane 2.51 Methyl Formate 1.49
Acetylene 1.76 2,2-Dimethylpropane 2.52 Methyl Mercaptan 1.64
Alkyl Alcohol 1.96 Dimethyl sulfide 2.30 Methyl propionate 1.95
Ammonia 0.79 1,4-Dioxane 2.24 Methyl n-propyl Ketone 2.46
n-Amyl Alcohol 3.06 Ethane 1.47 Naphtha 3.03
Aniline 2.54 Ethyl Acetate 1.95 Naphthalene 2.94
Benzene 2.45 Ethyl Alcohol 1.37 Nitromethane 1.72
Biphenyl 4.00 Ethylamine 1.90 n-Nonane 3.18
1,3-Butadiene 1.79 Ethyl Benzene 2.80 n-Octane 2.67
Butane 1.71 Ethylcyclopentane 2.52 n-Pentane 2.18
iso-Butane 1.93 Ethylene 1.41 iso-Pentane 2.15
Butene-1 2.20 Ethylene Oxide 1.93 Propane 1.81
cis-Butene-2 2.06 Diethyl Ether 2.16 n-Propyl Alcohol 2.12
trans-Butene-2 1.97 Ethyl Formate 2.26 n-Propylamine 2.07
n-Butyl Alcohol 2.91 Ethyl Mercaptan 1.78 Propylene 1.95
iso-Butyl Alcohol 1.89 n-Heptane 2.59 Propylene Oxide 2.18
tert-Butyl-Alcohol 1.34 n-Hexane 2.71 iso-Propyl Ether 2.29
n-Butyl Benzene 3.18 Hydrazine 2.22 Propyne 2.40
iso-Butyl Benzene 3.12 Hydrogen Cyanide 2.09 Toluene 2.47
n-Butyric Acid 2.63 Hydrogen 1.30 Triethylamine 2.51
Carbon Disulphide 5.65 Hydrogen Sulphide 2.54 Trimethylamine 2.06
Carbon Monoxide 1.32 Methane 1.00 Vinyl Chloride 2.32
Carbon Oxysulphide 1.07 Methyl Acetate 2.01 Vinyl Ethyl Ether 2.38
Cyanogen 1.12 Methyl Alcohol 1.16 o-Xylene 2.79
Cyclohexane 2.43 Methylamine 1.29 m-Xylene 2.55
Cyclopropane 1.60 Methylcyclohexane 2.26 p-Xylene 2.55
The menu item appears as: “Set Gas Factor”.
From the Set Gas Factor text scroll, hold the magnet over PGM1 or PGM2 until the “▼” prompt appears and
continue to hold the magnet in place for an additional 3-4 seconds (until the display starts to scroll “Set
Factor”). The display will then switch to “X.XX“(where X.XX is the current gas factor). Swipe the magnet
momentarily over PGM1 to increase or PGM2 to decrease the gas factor level until the correct value is
displayed. Hold the magnet over PGM1 or PGM2 for 3 seconds to accept the new value. The display will
scroll “Factor Saved”, and revert to “Set Gas Factor” text scroll.
Move to another menu item by executing a momentary hold, or, return to Normal Operation via automatic
timeout of about 15 seconds (the display will scroll “Set Gas Factor” 4 times and then return to Normal
Operation).