

The
60-meter capillary column is the newest unbreakable, fused
silica-lined, stainless steel technology, which gives good
separation of the TO-14 analytes with short run times. The
PeakSimple data system controls and sequences the entire
analysis, collecting the data from the three detectors,
loading and desorbing the traps, then calculating and printing
the results.
Since
it is small enough to take on-site for real-time measurements,
you can perform the analysis right at the source, avoiding
the need for expensive, labor-intensive canister sampling.
The vacuum pump interface allows the data system to turn
the external vacuum pump ON/OFF under PeakSimple control.
The vacuum pump is used to draw ambient air through the
traps for a precise amount of time, thus enabling the system
to sample unattended. The built-in air compressor eliminates
the hassle of transporting bulky air cylinders by providing
an endless supply of combustion air for the FID/DELCD combination
detector. To eliminate cylinders altogether, try the H2-50XR
hydrogen generator (part# 8680-0350) for both carrier and
FID combustion gases. The sensitive and non-destructive
PID detector can run on air carrier, too.

The
DELCD is completely selective for compounds containing chlorine
and/or bromine. Other analytes do not respond at all, even
at very high levels. The DELCD actually operates on the
FID exhaust gases. All contaminants are pre-combusted by
the FID to CO2 and H2O before reaching the DELCD.
The
first few peaks in the 8021 standard, especially vinyl chloride,
are of special interest to many analysts. This chromatogram
shows the expanded detail of the first few peaks (the VOC
gases) in the analysis shown above. Note the exceptionally
good resolution and peak shape delivered by SRI's dual trap
technology.