Detcon FP-424C - Manual (Page 6)

When calibrating with one gas (Cal Gas) and scale sensitivity is required for a different gas (Target Gas) use
the following calculation to determine calibration adjustment requirements: Target Gas K-Factor/Cal Gas
K-Factor x Cal Gas concentration = Required adjustment level
. For example, when calibrating with 50%
LEL methane when propane is the target gas: 1.81/1.00 x .5 = 90.5%. The sensor response is lower to
propane than it is to methane. We therefore need to adjust scale sensitivity higher when methane is used as
the Cal Gas.
When a sensor has been calibrated with one gas and another gas occurs in the area of that sensor, the scale
response is calculated as: Cal Gas K-Factor/Target Gas K-Factor. For example, when a sensor has been cali-
brated with methane and propane occurs in the area: 1.00/1.81 = 55%. If 40% LEL propane occurred the
sensor output would equal 22.0%.
In all cases remember that these K-Factor ratios are theoretical. Actual response may vary from sensor to
sensor. Always use the Target Gas as the Cal Gas when possible.
Detcon Model FP-424C Combustible Gas Sensor PG.6
Methylethylketone
Cyclohexane
Benzene
Hydrogen Sulphide
Methyl n-propylketone
Toluene
2,3-Dimethylpentane
Triethylamine
2,2-Dimethylpropane
Ethylcyclopentane
Aniline
m-Xylene
p-Xylene
n-Heptane
n-Butyric Acid
n-Octane
n-Hexane
o-Xylene
Ethyl Benzene
n-Butyl Alcohol
Naphthalene
Naptha
Decane
n-Amyl Alcohol
iso-Butyl Benzene
n-Butyl Benzene
n-Nonane
Biphenyl
Carbon Disulphide 2.42
2.43
2.45
2.45
2.46
2.47
2.51
2.51
2.52
2.52
2.54
2.55
2.55
2.59
2.63
2.67
2.71
2.79
2.80
2.91
2.94
3.03
3.05
3.06
3.12
3.18
3.18
4.00
5.65 Ethyleneoxide
Ethyl Acetate
Methylpropionate
Propylene
Alkyl Alcohol
trans-Butene-2
Methyl Acetate
Diethylamine
cis-Butene-2
Trimethylamine
n-Propylamine
Hydrogencyanide
n-Propyl Alcohol
iso-Pentane
Diethyl Ether
Acetic Anhydride
n-Pentane
Propyleneoxide
Butene-1
Hydrazine
1,4-Dioxane
Ethyl Formate
Methylcyclohexane
Methylethylether
iso-Propylether
Dimethylsulphide
Vinyl Chloride
Vinylethylether
Propyne 1.93
1.95
1.95
1.95
1.96
1.97
2.01
2.05
2.06
2.06
2.07
2.09
2.12
2.15
2.16
2.17
2.18
2.18
2.20
2.22
2.24
2.26
2.26
2.27
2.29
2.30
2.32
2.38
2.40 Ammonia
Methane
Carbon Oxysulphide
Cyanogen
Methyl Alcohol
Methylamine
Hydrogen
Carbon Monoxide
tert-Buty-alcohol
Ethyl Alcohol
Ethylene
Ethane
Methyl Formate
Cyclopropane
Dimethyl Ether
Methylmercaptan
Acetaldehyde
Butane
Nitromethane
Dimethylamine
Acetylene
Ethylmercaptan
1,3-Butadiene
Propane
Acetic Acid
iso-Butyl Alcohol
Ethylamine
Acetone
iso-Butane 0.79
1.00
1.07
1.12
1.16
1.29
1.30
1.32
1.34
1.37
1.41
1.47
1.49
1.60
1.60
1.64
1.66
1.71
1.72
1.73
1.76
1.78
1.79
1.81
1.84
1.89
1.90
1.93
1.93
Gas K Gas K Gas K
TABLE 1b (numerical listing)
Dimethyl Ether
Methylethylether
Methylethylketone
Methyl Formate
Methylmercaptan
Methylpropionate
Methyl n-propylketone
Naptha
Naphthalene
Nitromethane
n-Nonane
n-Octane
n-Pentane
iso-Pentane
Propane
n-Propyl Alcohol
n-Propylamine
Propylene
Propyleneoxide
iso-Propylether
Propyne
Toluene
Triethylamine
Trimethylamine
Vinyl Chloride
Vinylethylether
o-Xylene
m-Xylene
p-Xylene 1.60
2.27
2.42
1.49
1.64
1.95
2.46
3.03
2.94
1.72
3.18
2.67
2.18
2.15
1.81
2.12
2.07
1.95
2.18
2.29
2.40
2.47
2.51
2.06
2.32
2.38
2.79
2.55
2.55 Decane
Diethylamine
Dimethylamine
2,3-Dimethylpentane
2,2-Dimethylpropane
Dimethylsulphide
1,4-Dioxane
Ethane
Ethyl Acetate
Ethyl Alcohol
Ethylamine
Ethyl Benzene
Ethylcyclopentane
Ethylene
Ethyleneoxide
Diethyl Ether
Ethyl Formate
Ethylmercaptan
n-Heptane
n-Hexane
Hydrazine
Hydrogencyanide
Hydrogen
Hydrogen Sulphide
Methane
Methyl Acetate
Methyl Alcohol
Methylamine
Methylcyclohexane 3.05
2.05
1.73
2.51
2.52
2.30
2.24
1.47
1.95
1.37
1.90
2.80
2.52
1.41
1.93
2.16
2.26
1.78
2.59
2.71
2.22
2.09
1.30
2.45
1.00
2.01
1.16
1.29
2.26 Acetaldehyde
Acetic Acid
Acetic Anhydride
Acetone
Acetylene
Alkyl Alcohol
Ammonia
n-Amyl Alcohol
Aniline
Benzene
Biphenyl
1,3-Butadiene
Butane
iso-Butane
Butene-1
cis-Butene-2
trans-Butene-2
n-Butyl Alcohol
iso-Butyl Alcohol
tert-Buty-alcohol
n-Butyl Benzene
iso-Butyl Benzene
n-Butyric Acid
Carbon Disulphide
Carbon Monoxide
Carbon Oxysulphide
Cyanogen
Cyclohexane
Cyclopropane 1.66
1.84
2.17
1.93
1.76
1.96
0.79
3.06
2.54
2.45
4.00
1.79
1.71
1.93
2.20
2.06
1.97
2.91
1.89
1.34
3.18
3.12
2.63
5.65
1.32
1.07
1.12
2.43
1.60
Gas K Gas K Gas K
TABLE 1a (alphabetical listing)