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

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RUN Mode
Stat\History^HCD
PN 903-8797, Rev A
Interpreting the Parameter Results and Symbols Displayed
on the User Interface
Interpreting the results displayed on the User Interface is relatively easy. How-
ever, the appearance of the '=' and '<' symbols preceding the HCDP tempera-
ture must be observed carefully.
• If the '=' (equal to) symbol precedes the HCDP temperature, it indicates
that hydrocarbon condensation was detected and its dewpoint tempera-
ture is displayed. (The displayed value is 'equal to' the actual reading.)
• If the '<' (less than) symbol precedes the HCDP temperature, it indicates
that hydrocarbon condensation was not detected. The actual current dew-
point temperature is, therefore, below (less than) the displayed tempera-
ture, which is the lowest temperature reached during the Cooling Stage.
(The displayed value is 'less than' the actual reading.)
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 displayed
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 deter-
mined, at the end of the Cooling Stage, the asterisks ('****') on the User Inter-
face 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 analog
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.
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User Interface 3-9