PN 903-8797, Rev A
Operating in Standby Mode (Fault Alarm)
When the detection of the HCDP is improbable, the built-in diagnostic func-
tion activates and latches the Fault Alarm relay, turns LED 2 On, and places the
analyzer in Standby Mode. While in Standby Mode, the User Interface ashes
to alert the operator that immediate attention is required. Since the Fault
Alarm is latched, it can only be cleared manually, by the operator. The analyzer
continues to execute the measuring cycle and, if the Fault is due to a problem
in one of the internal optical paths, the HCDP temperature is set to full-scale,
40 °C (104 °F).
The reason for the Standby Mode condition is provided in the SCode and
XSCode menus. SCode and XSCode are seen by repeatedly pressing the ‘+’ or
‘–’ button while viewing SCode or XSCode data. Detailed information and cor-
rective action for all of the SCode and XSCode conditions can also be seen in
the troubleshooting charts (see “Status Code, Alarm Conditions, and Corrective
Action”).
To verify that the Fault Alarm condition is real, and not simply caused by elec-
tronic noise (e.g., due to an AC power surge or brown-out), attempt to return
the analyzer to normal operation by resetting the current alarms. To reset
alarms, view the “En\Dis Alrm?” prompt (Stat\History menu) and press ‘+’ to
clear the alarms.
If another Fault Alarm occurs during the next measuring cycle, attempt to
return to normal operation by resetting the Microcontroller board (press the
and ‘–’ buttons simultaneously). If yet another Fault Alarm occurs during the
rst measuring cycle after the system reset, the analyzer requires service. See
“Requesting Technical Support” in this chapter for information about how to
receive customer support.
RUN Mode
Stat\HistorySCode (or
XSCode)
4-40 | 241CE II Hydrocarbon Dewpoint Analyzer
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