Sheltered Systems - Ametek 241CE II User Manual

Units of measurement set
incorrectly

Sheltered Systems

If your analyzer is installed in a custom shelter, check the air filters 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 filters more frequently.
4-10 | 241CE II Hydrocarbon Dewpoint Analyzer
(Continued)
Measurement Interferences
The analyzer uses light – from LEDs – reflected from cold
surfaces to detect when liquids condense onto the surfaces
and exploits the difference 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, Olefins, Paraffins, 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.
PN 903-8797, Rev A