Interpreting The Parameter Results And Symbols Displayed On The User Interface - Ametek 241CE II Operator's Manual

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RUN Mode
Stat\History^HCD
4-10 | Model 241CE II Hydrocarbon Dewpoint Analyzer
Interpreting the Parameter Results and Symbols Displayed on
the User Interface
Interpreting the results displayed on the User Interface is relatively easy.
However, the appearance of the '=' and '<' symbols preceding the HCDP
temperature must be observed carefully.
• If the '=' (equal to) symbol precedes the HCDP temperature, it indi-
cates that hydrocarbon condensation was detected and its dewpoint
temperature is displayed. (The displayed value is 'equal to' the actual
reading.)
• If the '<' (less than) symbol precedes the HCDP temperature, it in-
dicates that hydrocarbon condensation was not detected. The actual
current dewpoint temperature is, therefore, below (less than) the dis-
played temperature, which is the lowest temperature reached during
the Cooling Stage. (The displayed value is 'less than' the actual read-
ing.)
The unit of measurement displayed for each signal depends upon the
system of units (Metric or Imperial).
As soon as the Cooling Stage begins, the HCDP temperature value dis-
played on the User Interface is replaced by asterisks ('****') to indicate
that a new value is being determined. The value replaced by the asterisks
is stored in the History Buffer (^HCD) in the Stat\History menu.
Until a new value is determined, the analog output signal is held constant
at the value from the previous measuring cycle. As soon as a new value is
determined, at the end of the Cooling Stage, the asterisks ('****') on the
User Interface and the previous value on the analog output channel are
replaced by the new temperature value.
Since it is not possible to represent the '<' (less than) symbol on the ana-
log signal channels, perform the following checks to determine whether
the HCDP temperature is 'equal to' or 'less than' the value indicated by
the analog signal:
• View the LEDs on the User Interface to determine which alarms have
been triggered, if any. If LED 4 (Hydrocarbon-Dewpoint-Temperature-
Not-Found) is On, the HCDP temperature was not detected and,
therefore, is 'less than' the actual reading.
• View the RUN menu for the current HCDP temperature.
• View the SCode and XSCode (Stat\History menu) for HCDP-related
alarms.
• If necessary, view the HCDPA sub-menu item (ApplicCFG menu) to
view the current setpoint for the HCDP temperature Off-Spec Alarm.