Honeywell RAEGuard 3 - Cross Calibration Flammable Gas Detector

RAEGuard 3 User Manual
79
16.2 Cross Calibration Flammable Gas Detector
(Not tested as part of the performance approval)
For greatest accuracy, a catalytic gas detector should be calibrated using
a certified gas/air mixture equal to 50%LEL of the actual target gas
intended to be monitored.
However, it is not always practical to obtain every detectable type of
hydrocarbon gas in a calibration-ready, certified and verifiable form.
Therefore, it is possible to carry out a “correction factor” to calibrate using
another hydrocarbon gas/air mixture.
Gas/Vapour
Relative Response%
Correction
Factors(CF)
Methane
100
1.00
Hydrogen
121
0.83
Ethane
70
1.43
Propane
61
1.64
Butane
49
2.04
Pentane
42
2.38
Hexane
39
2.56
Heptane
35
2.86
Octane
32
3.13
Ethylene
70
1.43
Methanol
72
1.39
Ethanol
54
1.85
Propan-2-ol
40
2.50
Acetone
42
2.38
Butan-2-one
(MEK)
40
2.50
MIBK
30
3.33
Cyclohexane
37
2.70
Di-Ethyl Ether
39
2.56
Notes:
Where the user calibrates any sensor using a difference gas, responsibility for
identifying and recording calibration rests with the user. Refer to the local
regulations where appropriate.