Waters GCT Premier Operator's Manual page 271

Excessive leakage current (in FI source): (Continued)
Possible cause
Leakage between the extraction rods
and the emitter.
Poor sensitivity for reference material (in FI source):
Possible cause
Emitter is not intact.
Reference reservoir tube has been
bent so that it no longer points at
the emitter.
Poor GC sensitivity (in FI source):
Possible cause
The source end of the column is not
cleanly cut.
Column position not lined up with
the emitter.
Corrective action
Withdraw the emitter by 5 to 10 mm
from the extraction rods.
Remove the ion source, and clean
the extraction rods.
Removing the FI/FD outer
See also:
source on page 9-6
extraction rods on page
Corrective action
Replace the emitter.
There can be significant varia-
Tip:
tion between performance of
individual emitters.
Check the reference reservior tube.
See also: GC-FI column position: on
page 9-20.
Corrective action
Check the position of the emitter
relative to the end of the column and
adjust if required.
See also: Figure titled "GC-FI
column position:" on page
Check the position of the emitter
relative to the end of the column and
adjust if required.
See also: Figure titled "GC-FI
column position:" on page
Component hardware troubleshooting 11-13
and Cleaning the
10-42.
9-20.
9-20.