Hardware manual

4-74 Agilent 7500 Series ICP-MS Hardware Manual
4Maintenance
5 Place the O- ring in the gap on the interface.
6 Replace the sampling cone on the interface. Turn by hand until tight. Be
careful not to allow the cone to drop. Use your other hand to support the
cone.
7 Using the supplied sampling cone removal tool, tighten to the position
indicated by the mark (Figure 69).
3 Move the torch box back to the original position, install the torch box
cover, and close the cover.
Testing the Cones
Perform the basic test after maintenance. See “Testing After Maintenance”
later in this chapter. If the vacuum level is inadequate when the plasma is on
(> 5 x 10
2
Pa of the vacuum pressure (IF/BK), > 2 x 10
-3
Pa of the vacuum
pressure (AN)), switch to standby mode and wait 10 minutes before checking
that the cones are attached tightly enough to seal with the vacuum chamber.
CAUTION
Attach the torch box cover after maintenance. This cover reduces the emission noise
from the plasma.