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Replacing Parts
97
5
7.
Use a 7/16-inch wrench to unscrew the coupling from the probe. Unscrew the
adaptor nut from the probe with a 5/16-inch wrench.
8.
Remove and discard the fused silica capillary, ferrule, and O-ring.
9.
Examine the end of a length of new 300
×
100 µm fused silica capillary. Use the
loupe to ascertain that you cut the end squarely.
Note:
Always make perpendicular cuts in the capillary, afterward examining them for
squareness with the loupe.
10. Feed the fused silica capillary through the probe.
11. Press the new O-ring into the groove facing the short end of the coupling.
12. Slide the coupling (short end first) onto the capillary and finger tighten.
13. Slide a GVF004 ferrule onto the capillary.
14. Position the filter with the flow direction arrow pointing towards the coupling.
Connect the coupling to the filter, making sure the capillary is fully seated inside the
filter.
15. Tighten only until the capillary is snug in its fitting, then gently tug it to be sure it
remains in place.
16. Tighten the coupling to the probe with a 7/16-inch wrench.
17. Run your fingers across the edges of the ceramic capillary cutter to determine which
edge is the smooth one. Use the smooth edge to cut the capillary so that 0.5 to 1
mm extends beyond the nebulizer tip.
Note:
The capillary should extend 0.5 to 1.0 mm from the end of the nebulizer. If it
does not, reinstall the capillary.
18. Unscrew the coupling from the probe and withdraw the capillary from it.
19. Slide a GVF004 ferrule, followed by the adaptor nut and then another GVF004
ferrule, onto the capillary.
20. Use a flame to remove about 20 mm of polyamide coating from the end of the
capillary. Clean with a methanol-saturated tissue.
21. Carefully reinsert the capillary into the probe. Tighten the coupling with a 7/16-inch
wrench.
22. Replace the probe end-cover and retaining screws.
23. Use the 1.5-mm hex wrench to tighten the set screws in the probe end-cover,
clamping the filter in place.
24. Replace the probe heater assembly.
STOP
Attention:
Overtightening the fitting can damage the capillary.