Response Of Combustible Sensor To Various Gases - Teledyne 9700 Instruction Manual

Flue Gas Analysis System

Response of Combustible Sensor to Various Gases

Response factors have been determined to relate the sensor output of a
specific compound to the output obtained using methane. A list of some
typical compounds is given in Table 1 along with their LEL (Lower Expo-
sure Limits) values. To determine the output of the sensor for any of the
gases listed, compared to the same concentration of methane, multiply the
reading obtained by the factor listed. For example, if the output is cali-
brated with methane at 2%, the output for ethylene at 2% would be
2.0% X 1.26 = 2.52% methane equivalent.
COMPOUND
Methane
Hydrogen
Carbon Monoxide
Ethane
Ethylene
Acetylene
Propane
Propylene
Butane
Hexane
Cyclohexane
Heptane
Benzene
Pentane
Toluene
Ethylene oxide
Methyl Ethyl
Ketone
Methyl Acrylate
*
Gases and Volatile Solids, National Fire Protection Agency.
NOTE: For compounds not listed in Table 1, consult the factory.
TABLE 1: Detector Response To Various Gases
LEL*
5.0
4.0
12.5
3.0
2.7
0.5
2.2
2.0
1.9
1.1
1.3
1.05
1.3
1.5
1.2
3.6
1.8
2.8
Taken from Fire Hazard Properties of Flammable Liquids,
TELEDYNE BROWN ENGINEERING
Analytical Instruments
RESPONSE FACTOR
1.00
0.86
0.32
1.20
1.26
1.39
1.42
1.33
1.54
1.50
1.44
1.59
1.50
1.45
1.48
0.76
0.96
0.59
Appendix
A-5