INFICON HAPSITE ER Chemical Identification System - Manual (Page 220)

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HAPSITE ER Operating Manual
CAUTION
All unknown samples should first be collected with the
Survey Method to estimate the total VOC response. The
Survey Method allows the operator to gain knowledge of
how far away to hold the probe from the sample and if a
concentrator needs to be used.
For a Survey run, the probe is, at first, held away from the suspected VOC source.
This is to clear the Survey line and obtain a background signal level. The source
should be sampled for up to 1 minute, depending on the result. If the TIC count
remains under 5,000,000, then continue to sample for up to 1 minute. If the TIC
count increases above 5,000,000, sample for 15 seconds. Then, allow the TIC
graph to return to the baseline level. If the TIC count increases above 10,000,000.
Move the probe back from the source or discontinue sampling. Allow the TIC to
return to the background level before stopping the run. See
Figure 6-1 .
NOTE: If Survey is not stopped manually, it will automatically stop at 3 minutes.
CAUTION
Do not touch the sample to the probe. Do not allow
liquids to enter the probe.
HINT: Refer to Chapter 3, Operating HAPSITE in Portable Mode for additional
information on running methods.
Figure 6-1 Sample Running Survey Method from the Front Panel
MAX . . . . . . . . . . . . . . . . . . . . . . . . . Is the maximum signal count for the TIC in
the window. The TIC is an indication of the
level of VOCs present at the source.
TIC . . . . . . . . . . . . . . . . . . . . . . . . . . Is the current TIC level.