Insert/Liner Care; Leaks - HP 5890 Series II Plus Reference Manual

Preventive Maintenance
Packed column inlet
Caution Column flow is interrupted while changing septa; since some columns
may be damaged at elevated temperature without carrier flow, cool the
oven to ambient before proceeding.
Exercise care! The oven and/or inlet or detector fittings may be hot
WARNING
enough to cause burns.
Turn off carrier flow and decrease head pressure to zero. Remove the
septum retainer nut and old septum. Insert a new septum. Replace the
septum retainer nut, tightening it to finger•tightness(as tight as possible
by hand without using any kind of tool). Do not overtighten; the retainer
nut is spring•loadedto provide sufficient pressure for sealing. Restore
carrier flow.

Insert/liner care

Cleaning inlet inserts and/or liners is discussed under Liner and/or
insert care, later in this chapter.

Leaks

Leaks in the gas plumbing system can affect chromatographic results
dramatically. The following procedure checks the flow system up to but
not including the column connection. If this portion of the system proves
to be leak free, refer to procedures later in this chapter to leak•checkthe
detector.
1. Turn off detectors. As necessary, set oven and heated zone
temperatures to ambient and allow zones to cool. Turn off gas supplies
at their sources.
2. Remove any installed column and cap the inlet at its column fitting.
3. Turn on gas to the inlet at its source and adjust its supply pressure to
344 kPa (50 psi).
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