INFICON HAPSITE ER Chemical Identification System - Manual (Page 429)

13 - 13
IP
N 07
4-
47
1-
P1
B
HAPSITE ER Operating Manual
13.2.5 Making the Measurement
To make a measurement using the HSS, a method is required. To quantify the
analytes detected, a calibration library in the method is required.
Once the calibration library method is completed, samples may be analyzed and
compared to the calibration library for quantitative analysis. Sample analysis must
be performed using the same procedure used to perform the calibration runs.
Refer to Chapter 11, Method Editor and Chapter 12, Target Compound Methods
for additional information on developing methods and calibration libraries for
quantitative analysis.
13.3 Maintenance of the HSS
Other than replacement of consumable items, most maintenance will involve
routine purging of the system. Purging will be necessary when analyzing high
concentration samples, replacing the needle, or cleaning of the sample wells. See
section 16.9, Replacing the HSS Needle, on page 16-41 .
13.3.1 Clean Out after a High Concentration Sample
When high concentration samples are analyzed using the HSS, the system can
retain analytes which could be detected in the next sample run. This is typically
referred to as a carryover contamination. Carryover contamination can be reduced
to approximately 0.1% by using Purge. In the case of severe carryover, use the
Flush function.
13.3.1.1 Purge Procedure
To purge the HSS, run a blank with the HSS needle in a clean, empty 40 mL purge
vial. In some cases, the blank may need to be run more than once.
HINT: A blank is the same method run without introducing a sample.
13.3.2 Cleaning Up a High Background
High background is usually encountered because some compounds are retained
in the HSS or the HAPSITE. These compounds could be in the HSS valves,
Transfer Line or within the HAPSITE.
To test whether the background is in the HSS or the HAPSITE, disconnect the
Transfer Line, connect the air sampling probe to the HAPSITE, and analyze a clean
air sample. If the contamination is no longer present, the contamination is in the
HSS or Transfer Line.
Once the HAPSITE has been tested, test the Transfer Line by reconnecting it to the
HAPSITE and disconnecting it from the HSS. Perform an analysis of clean air with
the Transfer Line connected. If the contamination is not present, then the
contamination is in the HSS.