Thermo Scientific ISQ EC, Operating Manual

Page: 179 / 232

7
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Maintenance and Service
ISQ EC and ISQ EM Mass Spectrometer Operating Manual Page 179
TIP The source chamber housing does not need to be removed in order to
replace the probe assembly.
IMPORTANT As the ESI probe assembly is removed from the source
chamber housing, there will be an audible sound along with a physical
change as nitrogen gas escapes into the atmosphere.
10) To remove the capillary from the ESI probe assembly, it will be
necessary to push down on a spring-loaded retaining knob, while at
the same time removing the probe capillary by turning the PEEK
knurled fitting counter-clockwise as shown in Figure 100.
Figure 93: Removing the capillary from the ESI probe assembly
TIP The old probe is made out of stainless steel and will be discolored from
previous use under high temperature conditions. This is normal.
11) Place the old probe aside and replace with a new probe that ships in
the instrument accessory kit.
12) During replacement, it is important to carefully thread the capillary
back into the ESI assembly body.
13) Hand-tighten the probe to where the capillary barely protrudes from
the probe as shown in Figure 1Figure 94.
14) Adjust the protrusion depth of the capillary by turning the PEEK
knurled fitting until the spray probe tip aligns with the top hash mark
on the source housing and the needle aligns with the second hash