116 Troubleshooting and Maintenance Manual
4 General Maintenance
To remove/reinstall the GC/MS interface heater and sensor
Materials needed
• Screwdriver, Torx T-15 (8710-1622)
• Hex driver, 1.5 mm (8710-1570)
Removal
1 Vent the MS. See the Agilent 7000 Series Triple Quad GC/MS Operation
Manual.
2 Make sure you turn off the GC/MS interface heater. This heater is
controlled and powered by the GC.
3 Separate the MS from the GC. See “To separate/connect the MS and the
GC” on page 86.
4 Remove the cover from the GC/MS interface.
5 Slide the insulation off the GC/MS interface (Figure 16).
6 Loosen the two heater sleeve screws.
7 Slide the heater sleeve off the GC/MS interface. It may be necessary to
gently pry open the slot in the heater sleeve to loosen the heater sleeve
from the interface.
8 Loosen the setscrew and remove the heater and temperature sensor from
the heater sleeve.
Heat and oxidation often result in a heater or, less frequently, a temperature
sensor, being “welded” inside the heater sleeve. The holes for the heater and
sensor pass all the way through the heater sleeve. A rod can be inserted to
drive the stuck part out. However, to function correctly, the heater and sensor
must have perfect contact with their holes. If a heater or sensor is difficult to
remove, the holes will probably be damaged enough that the heater sleeve
should be replaced. Polishing the holes is not an acceptable solution since it
will enlarge the holes.
The GC/MS interface operates a very high temperatures. It is also well insulated.
Make sure the interface is cool before you touch it.
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