MSA Solaris Manuel D'exploitation page 46

RESPONSE NOTES:
1
. The compounds may reduce the sensitivity of the combustible gas sensor by poisoning
or inhibiting the catalytic action.
2. These compounds may reduce the sensitivity of the combustible gas sensor by
polymerizing on the catalytic surface.
3. For an instrument calibrated on Pentane,multiply the displayed %LEL value by the
conversion factor above to get the true %LEL.
4. These conversion factors should be used only if the combustible gas is known.
5. These conversion factors are typical for a Solaris Multigas Detector. Individual units
may vary by + 25% from these values
Table 6-5. COMBUSTIBLE GAS - Cross Reference Factors for
Solaris FX
This TABLE shows the variation in response of the 4P-50 CiTipel ® on exposure to a
range of gases and vapors at the same % LEL concentration
GAS VAPOR RELATIVE
SENSITIVITY*
Methane 100
Propane 65
nButane 65
n-Pentane 60
n-Hexane 50
n-Heptane 45
n-Octane 40
Methanol 95
Ethanol 85
Iso-propyl alcohol 60
Acetylene 80
*Each sensitivity has been rounded to the nearest 5%.
**T 90 for Ammonia is extended. Contact City Technology for details.
RESPONSE NOTES:
1. The compounds may reduce the sensitivity of the combustible gas sensor by poisoning
or inhibiting the catalytic action.
2. These compounds may reduce the sensitivity of the combustible gas sensor by
polymerizing on the catalytic surface.
3. The figures are experimentally derived and expressed relative to the methane signal
(= 100).
4. These conversion factors should be used only if the combustible gas is known.
5. The results are intended for guidance only. For the most accurate measurements, an
instrument should be calibrated using the gas under investigation.
6-4
GAS VAPOR RELATIVE
SENSITIVITY*
Carbon monoxide 115
Acetone 70
Methyl ethyl ketone 55
Toluene 40
Ethyl acetate 60
Hydrogen 115
Ammonia** 130
Cyclohexane 55
Leaded petrol 60
Unleaded petrol 60
Ethylene 85