9 Maintaining the PTV Inlet
To Clean the Septumless Head on the PTV Inlet
Maintaining Your GC 151
6 Unscrew the guide cap from the head and remove the PTFE ferrule.
7 Carefully insert a syringe with a 23-gauge needle into the head to press the valve body and
Kalrez seal slightly out of the head.
8 Gently tap the head on a soft, smooth surface so that the valve body falls out completely or
slips out far enough to grasp with fingers.
9 Remove the Kalrez seal from the valve body.
10 Clean all components in hexane.
Wear clean, lint-free gloves to prevent contamination of parts with dirt and skin oils.
11 Replace the PTFE ferrule. See “To Replace the Septumless Head PTFE Ferrule on the PTV
Inlet” on page 152.
12 Wearing clean lint-free gloves, reassemble the head in reverse order. Be sure that the seals
and the pressure spring are not damaged.
13 Finger-tighten the septumless head, then tighten an additional 1/8 turn with a wrench.
14 Reconnect the carrier gas line.
15 Check for leaks; if necessary, slightly tighten the guide cap with the syringe needle inserted.
• If the head leaks with the syringe inserted, replace the PTFE ferrule.
• If the head leaks without the syringe inserted, replace the Kalrez and Viton seals.
16 Perform an inlet Leak & Restriction test and reset the maintenance counters.
17 Exit maintenance mode. Select Maintenance > Instrument > Perform Maintenance >
Maintenance Mode > Finished.
18 Restore the analytical method.
Kalrez seal
Guide cap
Valve body
Pressure spring
Viton seal
Sealing element
PTFE ferrule
Carrier gas tube
Ferrule, 1/16-inch
PTFE
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