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Appendix C Scan/Calibration Procedure
15
Use a suitably sized syringe to introduce
the compound to be scanned into the
injection port of the closed loop system.
The injection volume was calculated in
step 1. Turn pump ON for approximately
30 seconds. Press "Enter=Continue".
16
The analysis menu on the right displays an option for "1=Start Logging".
Select this option. After a short period where the pump circulates the
compound, the analyzer displays "Log in progress" after the countdown.
17
At the end of the Peak pick, select "Enter=Save".
18
Press "Esc" until Main menu appears.
19
Use pump to remove compound from analyzer (approximately 5 minutes).
To perform a Full Spectrum Scan
1. Calculate the injection volume of the injected compound into a Closed Loop
System (CLS) using the equations provided in Chapter 12 "User Performance
Verification."
3. From the Main Menu, select "2=Change gas"
4. Select "Enter=Other". (If no application has been selected previously, it skips
to Step 3.)
5. Select "4=Spectrum scan"
6. Select either "5=Full-L" for long path scanning (used for lowest detectable
levels) or "6=Full-S" for short path scanning (used for higher concentration
scans). Note that higher quality results are obtained using a full scan. The
Main Menu returns.
7. From the Main Menu select "1=Analyze/Start"
8. Attach the closed loop system to the analyzer ("in" port on pump attaches to
"out" port on analyzer, "out" port on pump attaches to "in" port on analyzer).
Note that the instruction to "Install chemical filter" does not apply to a
spectrum scan, and the closed loop system should be installed.
9. Turn closed loop system pump ON for approximately 15 seconds. Select
"Enter=Continue" and wait for zero scan (approximately 5 minutes)
1
A gas or liquid syringe is required, depending upon the compound. Many compounds (e.g., benzene) are
more expensive and only available in larger quantities in gaseous form, and are therefore usually inserted
into the pump as a liquid. The pump evaporates the liquid before it is introduced to the analyzer. Syringes
can be obtained from chemical or scientific supply houses.
Injection Port
1
.
C-4
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