Cross Calibration Flammable Gas Detector - Honeywell Sensepoint XCD Technical Manual

Sensepoint XCD Technical Manual

19.2 Cross Calibration Flammable Gas Detector

For greater 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
"cross calibration" using another hydrocarbon gas/air mixture.
When the Sensepoint XCD Combustible LEL sensor is to be calibrated with a gas which is
different to the gas or vapour to be detected, the following cross calibration procedure may
be followed:
Caution: Where the user calibrates any sensor using a different gas, responsibility for
identifying and recording calibration rests with the user. Refer to the local regulations where
Notes:
1. Table 11 lists a selection of hydrocarbon compounds and states a reference figure or
"Star Rating" according to the reaction they produce in relation to other hydrocarbons.
2. An eight star (8*) gas produces the highest output, while a one star (1*) gas produces
the lowest output.
appropriate.
No.
1 Acetone
2 Ammonia
3 Benzene
4 Butanone
5 Butane
6 Butyl acetate
7 Butyl acrylate
8 Cyclohexane
9 Cyclohexanone
10 Diethyl ether
11 Ethane
12 Ethanol
13 Ethyl acetate
14 Ethylene
15 Heptane
16 Hexane
17 Hydrogen
18 Methane
19 Methanol
20
21 Octane
22 Pentane
23 Propane
24 Propan-2-ol
Gas Star Rating
MIBK
67
SPXCDHMANEN Issue 2
4*
7*
3*
3*
4*
1*
1*
3*
<1*
4*
6*
5*
3*
5*
3*
3*
6*
6*
5*
3*
3*
3*
5*
4*