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October 2007
The PACER Cycle
E-4
GE Sensing has developed and patented a compensation technique
called PACER (Programmable Automatic Contaminant Error
Reduction) that is very effective in reducing the Raoult Effect error
associated with soluble contaminants, particularly for near-ambient
dew points. The OptiSonde is equipped with the PACER cycle as well
as AUTO balance as found on earlier models. The user can choose
which self-cleaning and balancing routine to run depending on the
severity of contamination.
The PACER cycle, diagrammed in Figure E-2 below, begins with a
coalescence period, during which the mirror is cooled well below the
dew point of the sample gas, condensing out a large amount of water.
Figure E-2: A Typical PACER Cycle
Theory of Operation and Glossary
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