Chapter 9 95
Glossary
Chapter 9
Glossary
The following is a glossary of the most commonly used terms and abbreviations in
this manual.
Term Description
ADC Analog to digital signal converter.
Air 1 Flow Air flow that is split between the combustor and wall
gas mixture using the fine adjust needle valve.
Air 2 Flow Air flow that is delivered directly to the wall gas
mixture.
Alpha Scaling factor that modifies the Gate B integration
value when the dual gate technique is employed to
obtain PFPD signal output.
Attenuation A scaling factor by which the PMT output signal is
decreased. The observed signal is equal to the actual
signal divided by the attenuation.
Auto Zero Output signal zero value automatically set by
WinPulse. This is activated at a specified time during
an analytical run.
Channel Corresponds to a specified PFPD output signal.
Combustor Transparent quartz tube within which the GC column
effluent combusts.
Combustor Gas (COMB) H
2
-rich, H
2
/Air mixture delivered to the combustor.
Combustor Sleeve Metal sleeve that surrounds the base of the combustor
to separate the combustor and wall gases.
Combustor Support Metal fitting that positions the combustor at the
correct position for optimum response.
DAC Digital to analog signal converter.
Detectivity Minimum detectable amount of analyte passing
through the PFPD (usually measured in picograms per
second). Detectivity is the proper method for evaluat-
ing detector performance because it is a measure of
the signal to noise ratio.
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