PN 903-8797, Rev A
At any given time, the Hydrocarbon Dewpoint (HCDP) value presented on the
analog signal channel and displayed on the User Interface is the value deter-
mined during the previous Cooling Stage. SCode is updated at the end of each
measuring cycle stage and MTemp is always the current value. If an external
water signal is used and either H2O DP:EXT or H2O CT:EXT is enabled from
the MonitorCFG menu, the external Water Dewpoint (WDP) or external Water
Content (WCT) value can also be displayed, but do not aect the operations of
the analyzer.
As soon as a new value is determined, it is displayed on the User Interface and
its analog signal channel. The mirror temperature (MTemp) is always the cur-
rent value.
Validating the Current Results
The results obtained by the rst few measuring cycles will be invalid upon start-
up immediately following installation or after servicing the sample system.
The results obtained by the rst few measuring cycles are usually
slightly too low (invalid) due to contamination. This can be caused by
the residual water remaining from the cleaning (after maintenance)
and/or exposure of the sample system to the atmosphere – i.e., diluted
with residual air after installation or maintenance.
Depending on the degree of contamination and the purging duration,
the number of measuring cycles required to obtain valid results can
vary. Typically, ve measuring cycles will be sucient to remove the
water or air contaminants after the sample system has been exposed
to water or the atmosphere.
As the degree of dilution is reduced to zero during subsequent Purging/Hold
Stages, the measured HCDP temperature approaches the true value for the
sample gas.
Viewing Previous Results
To view results from previous measuring cycles, view the Stat\History menu
and view any of the History Buers. The History Buers contain information
about the status of the system during the last nine measuring cycles (‘1’ =
most recent entry; ‘9’ = oldest entry). On subsequent measuring cycles, the
oldest entry is removed from the buer and the latest entry is stored.
3-10 | 241CE II Hydrocarbon Dewpoint Analyzer
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