INFICON HAPSITE ER Chemical Identification System - Manual (Page 532)

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HAPSITE ER Operating Manual
Carrier Gas . . . . . . . . . . . . . . . . . . . The pure inorganic gas used to aid the flow
of sample gas through the chromatograph for
analysis. In the HAPSITE VOC-free Nitrogen
is normally used.
Column . . . . . . . . . . . . . . . . . . . . . . The active element of the Gas
Chromatograph. The column is a long glass
capillary which is lined with a material (called
the “stationary phase”) with which the
analytes interact based on their physical
characteristics, slowing their flow. The
degree of this interaction, which is a
characteristic of each compound and the
chemistry of the stationary phase,
progressively separates the different
compounds from one another during elution.
Computed Integration Time. . . . . . This is the amount of time (in milliseconds)
during which the signal from each of the
masses in the specified mass range will be
gathered by the mass spectrometer. The
computation of this time incorporates the
Scan Time (sec) and the mass range.
Concentration. . . . . . . . . . . . . . . . . A measure of the amount of a compound in a
given volume or weight. This is represented
as a ratio, either in mass/mass,
mass/volume, or volume/volume terms. For
example: 10 ppm/v refers to a mix in which
the specified compound is present as 1 X
10
-5
parts of the whole, in volume terms.
DAC . . . . . . . . . . . . . . . . . . . . . . . . . Digital to Analog Converter. An element of
the electronic circuitry which converts the
microprocessor’s digital instructions to the
analog requirements for control of the
instrument.
DOC . . . . . . . . . . . . . . . . . . . . . . . . . Declaration of Contamination document that
declared what type of chemicals that the
instrument has been exposed to.
Electron Multiplier (EM) . . . . . . . . . The ion detector of the mass spectrometer.
Arrival of an ion causes emission of a burst of
electrons, each of which cause more
electrons to be emitted, providing a burst of
current in response to each ion.