Routine Maintenance: Inlets
Maintaining a PTV
Released: March 2004 6850 Series II GC User Information page 160 of 256
5. Replace the two O-rings and filter cartridge.
6. Check for leaks.
Replacing the inlet flow module
Replacing the PTV inlet flow module is similar to replacing a
split/splitless inlet flow module. See “Replacing the inlet flow module” on
page 124.
Leak testing the gas plumbing
Leaks in the gas plumbing can affect chromatographic results dramatically.
The following procedure checks the flow system up to but not including the
inlet flow manifold. If this portion of the system proves to be leak-free, refer to
the next procedure to check the inlet and inlet manifold.
Caution Liquid leak detectors are not recommended, especially in areas where
cleanliness is very important. If you do use leak detection fluid, immediately
rinse the fluid off to remove the soapy film.
Tools
• Electronic leak detector capable of detecting your gas type or liquid leak
detection fluid. If you use leak detection fluid, remove excess fluid when
you have completed the test.
• Two 7/16-inch wrenches
Procedure
Warning To avoid a potential shock hazard when using liquid detection fluid, turn the
GC off and disconnect the main power cord. Be careful not to spill leak
solution on electrical leads, especially the detector and inlet heater leads.
1. Using the leak detector, check each connection for leaks.
2. Correct leaks by tightening the connections. Retest the connections;
continue tightening until all connections are leak-free.
Leak testing the PTV inlet
There are numerous places in the inlet that can leak. This procedure lets you
determine, in general, if there is an unacceptable leak in the inlet. If the inlet is
leaking, you should use an electronic leak detector to pinpoint the component
that is leaking.
To Next Page
Loading...
Need help?
General
