3-34 | Model 241CE II Hydrocarbon Dewpoint Analyzer
If the Cooling Stage termination is due to the Thermoelectric Cooler be-
ing unable to further reduce the mirror temperature after 2 minutes, the
Stage-Time-Out (w TimeOut) SCode and Cooling-Stage-Time-Out (w Cool
TimeOut) XSCode are generated.
If the HCDP temperature was not determined, the Hydrocarbon-Dewpoint-
Temperature-Not-Found (w No HC DP) SCode is generated.
During the Cooling Stage, signal values displayed as asterisks (i.e., ‘****’)
on the User Interface indicate that a new value is being determined. Until
a new value is determined, at the end of the Cooling Stage, the analog
output signal is held constant at the value from the previous measuring
cycle. As soon as a new value is determined, the asterisks (‘****’) on the
User Interface and the previous value on the analog output channel are
replaced by the new HCDP temperature. The SCode message on the User
Interface and on the analog output channel is updated with the sum of all
SCodes generated since the end of the previous stage.
If any of the determined values exceed the associated alarm setpoint, or
the SCode indicates analyzer malfunction (i.e., a Fault or Warning alarm),
the appropriate relays are activated and their corresponding LEDs on the
User Interface are turned On. If the alarm is a Fault Alarm, the alphanu-
meric display on the User Interface will also flash. The SCode is deter-
mined by the built-in diagnostics function.
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