PN 903-8797, Rev A
Checking and Recording the Baseline Settings
On a monthly basis, check and record the phototransistor signals – WMir and
HCMir (baselines) – from the RUN Mode screen during the Purge cycle (Purg-
ing/Hold Stage) when the mirror temperature is at the upper setpoint (i.e.,
20 °C). Compare these values to the values listed in the “Gas Run Data” sheets
(part of the “Signed Final QC Documents” in the Documentation Package folder
shipped with the analyzer). Refer to the values at the start of the Cooling stage.
Possible Cause/
Condition Corrective Action
WMir/HCMir signals or
WLED/HCLED levels have
deviated >25 units from
their original start-up
values
If the WMir/HCMir signals or WLED/HCLED levels have deviated
>25 units from their original start-up values, it could indicate
mirror contamination.
Clean the Measuring Cell and mirror. See “Measuring Cell
Maintenance” in this chapter.
Fault or Warning Status Conditions
If the analyzer is repeatedly generating alarms that may indicate a faulty Peltier
Cooler or RTD, AMETEK suggests returning the assembly to the factory for
repair.
Possible Cause/
Condition Corrective Action
Status conditions
triggered
View the SCode or XSCode screen for alarm messages. If there
are alarm messages that may indicate that the Thermoelectric
Cooler or RTD show signs of being unable to cool down or warm
up the mirror include:
• w Check XSCode (SCode) – Peltier Cooler
• f No HC DP (SCode) – Peltier Cooler
• f Cool Cct (SCode) – Peltier Cooler and/or RTD
• f High Temp (XSCode) – RTD
• f Low Temp (XSCode) – RTD
Note:
If these or other problems are encountered,
contact AMETEK Service for information on what
to do with the equipment.
Review “Troubleshooting and Diagnostics” in this chapter for
information about the status conditions and the suggested cor-
rective actions to take to clear the conditions.
RUN Mode
Stat\HistorySCode (or
XSCode)
RUN Mode
RUN Mode
MonitorCFGWLED (or
HCLED)
4-8 | 241CE II Hydrocarbon Dewpoint Analyzer
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