System Overview | 2-5
Sensor Operations - WDG-VCM
Close-Coupled Extrative Flue Gas Analyzer
The WDG-VCM analyzer is ideal for natural gas-fired power boilers or for
those using gas during start-up and shutdown. With this analyzer, you
can monitor oxygen and combustibles for maximum fuel efficiency. In
addition, the methane detector can be used for purge and lightoff cycles
during start-up and shutdown.
WDG-VCM analyzers with a combustibles detector are used for pro-
cesses that use natural gas for start-up and oil, fuel gas or coal for primary
fuel. Process gas is drawn into the analyzer’s primary sample loop by an
aspirator and returns to process. Gas enters the split flow block that is
separted by a baffle and contacts the hot-wire catalytic combustibles and
methane detector. It then passes the zirconium oxide cell, where the oxy-
gen concentration is measured, before returning to the main sample loop
and then back to the process.
Detectors are very delicate and should be handled with care.
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