PN 903-8797, Rev A
Primary
Code
Error
Code
Alarm
Type Condition / Description / Suggested Corrective Action
4 3 Warning w Cool TimeOut [Cooling-Stage-Time-Out]
The analyzer has encountered a problem during the Cooling Stage of the measuring
cycle, such as when the lowest temperature that could be reached during the Cooling
Stage was higher than both the Low setpoint temperature for the mirror (MTLo) and the
HCDP temperature.
The condition can be aggravated by high surrounding ambient temperatures, high
gas pressures, continuously high air humidity (e.g., causing ice to build up on the
Thermoelectric Cooler – or TEC).
Corrective Action:
• Check the MTLo setting (ApplicCFG menu) and check the surrounding ambient
temperature and ensure that the dierence is not greater than 20 °C (68 °F). Adjust the
MTLo setting, if necessary.
• Check the MTLo setting to see if it is lower than -40 °C (40 °F). If it is, increase it to at
least -40 °C (-40 °F) or greater.
• Check the HCDP temperature (RUN menu) to see if it is particularly high (e.g., greater
than 20 °C/68 °F).
• Ensure there is free circulation of air past the ns of the Heatsink and that the enclo-
sure/shelter housing the analyzer is adequately ventilated.
• If high humidity is causing problems with ice build-up on the TEC, purge the Cooler
Housing with N
2
or another dry gas supply such as air, with a water dewpoint tem-
perature less than -40 °C (-40 °F) and a ow rate less than 15L/day (0.53 CFD). The
purge gas pressure upstream of the Flame Arrestor Fitting cannot exceed atmospheric
pressure by more than 1 PSIG (70 mBAR). See Figure 4-6 for location of Purge Flame
Arrestor Fitting (Purge Air Connection) on Cooler Housing.
• Determine if the pressure of the process stream is higher than usual, or if there has
been a signicant change in the composition of the gas stream. If the Measuring Cell
purge ow rate is >2 L/minute (4 SCFH), decrease the sample gas ow rate.
• Review the current SCode (Stat\History menu) to see if the “f Cool Cct” fault alarm
condition is present and follow corrective action procedures listed under “Status Code
(SCode), Alarm Conditions, and Corrective Action.”
8 4 Warning w Warn Time Out [Warning-Stage-Time-Out]
The analyzer has encountered a problem during the Warming stage of the measuring
cycle, such as the mirror temperature (MTemp) being unable to warm up to the HCDP
temperature determined in the previous Cooling Stage within a 2-minute period.
This warning alarm occurs when the HCDP temperature is very high and the surrounding
ambient temperature drops below the highest HCDP temperature during the Cooling
Stage.
Corrective Action:
• Check the HCDP temperature reading (RUN menu) and the surrounding ambient
temperature and determine if the ambient temperature has dropped below the last
reported HCDP temperature. Increase the ambient temperature if necessary. The
surrounding ambient temperature should be at least 15 °C (27 °F) above the highest
expected HCDP temperature.
4-52 | 241CE II Hydrocarbon Dewpoint Analyzer
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