PN 9000-133-VE, Rev U
Hydrocarbons in the Gas Sample
When hydrocarbons are present in the gas sample, a combustion process oc-
curs when this gas sample is exposed to the high temperature of the zirconia
cell. An indication that hydrocarbons may be present in the gas sample is that
the oxygen reading will be lower than expected. For example, if a calibration
gas cylinder has an oxygen value of 20 PPM and 5 PPM of hydrogen (balance
nitrogen), the oxygen analyzer will read 17.5 PPM oxygen. The reduction of
oxygen is due to the combustion process where 5 PPM of hydrogen will com-
bine with 2.5 PPM of oxygen to form water. Thus, the oxygen analyzer will read
17.5 PPM rather than the actual 20 PPM oxygen.
The amount of oxygen reduction is dependent on the type of hydro-
carbons present in the sample gas.
Overview
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Содержание WDG-V
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