PN 903-8797, Rev A
Units of measurement set
incorrectly
(Continued)
Measurement Interferences
The analyzer uses light – from LEDs – reected from cold
surfaces to detect when liquids condense onto the surfaces
and exploits the dierence in wetting properties to distinguish
between liquid hydrocarbons (e.g., non-polar substances) and
other liquids (i.e., of polar substance). It is, therefore, possible for
the analyzer to detect and report the condensation tempera-
ture of other non-polar substances as a hydrocarbon dewpoint
temperature.
In this regard, methanol is the only substance known to be
present at various times in natural gas streams that has been
observed to give a false indication of a hydrocarbon dewpoint
temperature. At higher concentrations, methanol dewpoints are
usually detected as a hydrocarbon dewpoint temperature.
Oils and other high molecular weight hydrocarbons (including
Asphaltenes, Olens, Parans, and Aromatics) can contaminate
the mirror surfaces. The hydrocarbons also interfere with the de-
termination of the hydrocarbon dewpoint temperature, if they
are not removed from the Measuring Cell during the Purging/
Hold Stage.
Sheltered Systems
If your analyzer is installed in a custom shelter, check the air lters for the
shelter purge and air conditioning systems and replace them if necessary. De-
pending on the location of the site and its environmental conditions, it may be
necessary to check and replace these lters more frequently.
4-10 | 241CE II Hydrocarbon Dewpoint Analyzer
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