Flow and Pressure Modules 2
Advanced Operation Manual 29
When installing or replacing a frit, always use a new O- ring
(5180- 4181, 12/pk).
Selecting a frit
The frits change the control range of the channels. The
objective is to find a frit that allows the required range of
flows at reasonable source pressures.
• For an auxiliary channel ordered as an option (part of
the GC order), use the frit supplied by the factory.
• For an auxiliary channel ordered as an accessory
(separate from the GC order), see the instruction
information supplied with the accessory.
• For a non- Agilent instrument, you must experiment to
find the appropriate frit.
When you change a frit, you change the physical
characteristics of the channel. It may be desirable (or
necessary) to change the PID constants for that channel. See
“PIDs” on page 21.
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