INFICON Explorer Portable Gas Chromatograph - Manual (Page 209)

Explorer Operator Manual
207
Injection Time (s) Approximate
Range (ppm)
0.5 10 to 150
3 1 to 15
6 0.5 to 7.5
With air carrier gas, the TVOC can be used to make accurate measurements below
0.1 ppm since there is no negative baseline dip. The detector response will also be
more linear over the concentration range. The sensitivity (peak height/ppm) is
reduced to approximately 1/3 of that obtained with nitrogen carrier gas, but the
absence of the negative baseline dip offsets the loss in sensitivity.
The ranges listed in the table below are approximate and are based on isobutylene
samples.
Injection Time (s) Approximate
Range (ppm)
0.5 3 to 300
3 0.3 to 50
6 0.1 to 25
Effects of Other Parameters
Backflush does not have any effect in TVOC mode when loop injection is selected.
When you are performing syringe injections, backflushing can reduce peak tailing
caused by the injection port. Backflushing of the injection port begins at the
specified backflush time.