5
Routine and Preventive Maintenance
Maintaining the APCI Probe
Thermo Scientific
Surveyor MSQ Plus Hardware Manual
71
4. Depending on whether the capillary protrudes from the tip of the probe, do one of the
following:
• If the capillary protrudes from the probe tip, go to
• If the capillary does not protrude from the tip of the probe, turn the probe
upside-down and gently shake the capillary assembly out of the probe. Adjust the
position of the graphite ferrule so that it is closer to the end of the PEEK insert, and
repeat
and
of this procedure. Continue to adjust the position of the
graphite ferrule until the capillary protrudes from the tip of the probe when you
insert the capillary assembly into the probe.
5. Screw the capillary retaining nut (adaptor) into the probe until fingertight and recheck
that the capillary protrudes from the tip of the probe. See
.
Figure 53.
View of APCI probe with the capillary retaining nut screwed in finger tight
6. Using the probe clamp, tighten the capillary retaining nut by one-half turn. Do not
overtighten the screw.
7. Finish reassembling the probe:
a. Place the locking plate and probe clamp in position.
b. Insert the M3
×
10 cap head stainless steel screw (P/N FM103046) and tighten with
the 2.5 mm Allen key.
Typically, a visual confirmation that the capillary protrudes from the probe tip is
sufficient, but you can also use the APCI spacer plate provided in the Surveyor MSQ Plus
tool kit to check the capillary protrusion depth.
8. (Optional) Align the hole in the center of the APCI spacer plate over the tip of the probe
and check that you can feel the capillary protruding through the spacer.
The APCI spacer is 0.41 mm thick. If you can feel the capillary protruding through the
hole in the center of the space plate, the capillary protrudes from the APCI probe tip by
more than 0.41 mm. See
Capillary
retaining nut
