Ametek 241CE II Operator's Manual page 95

Displayed
Abbreviation Description
WMir The current phototransistor signal from the water side of the
mirror (the unit of light reflected from the mirror surface).
During the analyzer's first Purge cycle (Purging/Hold Stage) after
a power-up, this value will be at its baseline level because there
are no liquids on the mirror.
HCMir The current phototransistor signal from the hydrocarbon side of
the mirror (the unit of light reflected from the mirror surface).
During the analyzer's first Purge cycle (Purging/Hold Stage) after
a power-up, this value will be at its baseline level because there
are no liquids on the mirror.

The factory-set default configuration settings for your analyzer can be
found in the Documentation Package shipped with the analyzer.
NOTE
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User Interface 4-9