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Running the restriction test
User Information
7 Disconnect the transfer line from the GC inlet. If a transfer
line needle is used, plug off the end with a septa. If there is
no needle, plug off the end with a union and plug.
8 Place an empty 20-mL capped vial in tray position 1. Make
sure the Headspace Sampler is set for 20-mL vials. See
page
80.
9 Place the aluminum leak test vial in tray position 2. Place the
end of the vial labeled "G1888" facing up.
10 Press the Menu key. Select Advanced Functions. Choose
menu item 18 Leak Test and press Enter. Press Enter
again to begin the test.
The Headspace Sampler loads the vial in tray position 1 into the
oven carousel and raises it onto the sampling probe. The vial
remains on the probe for the this part of the test.
1 The pressurization valve opens and pressurizes the vial for
0.2 minutes. After 0.2 minutes, the pressurization valve
closes. The vent valve opens for 0.3 minutes. The vented air
flows through ports 1, 3, 5, and 6 of the sampling valve.
Watch the beaker of water. The valve clicks and bubbles
emerge from the tube in the water. Normal behavior is a burst
of bubbles that slows and stops after 4-5 seconds.
2 The pressurization valve opens and pressurizes the vial for
0.2 minutes. After 0.2 minutes, the pressurization valve
closes. The vent valve opens for 0.3 minutes. The vented air
flows through ports 5 and 6 of the sampling valve.
The instrument switches the 6-port valve to the inject
position. Watch the beaker of water. The valve clicks and
bubbles emerge from the tube in the water. Normal behavior
is a burst of bubbles that slows and stops after 3-4 seconds.
3 At the end of the restriction test, the instrument returns the
empty glass vial to tray position 1. The Headspace Sampler
sets the valves in standby mode and loads the aluminum leak
test vial from tray position 2.
Maintaining the Instrument
149
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