Maintaining
90
5
6.
Remove the hexapole assembly from the graduated cylinder, and place it on a
lint-free cloth. Allow it to air-dry, or use a nitrogen flow to dry it.
7.
Insert the assembly, aligning the notches in the differential aperture at its rear with
the two bottom support rails on the analyser assembly. Carefully slide the assembly
into place (
). Be sure to insert the assembly fully.
8.
Check the condition of the three, rear, ion block support O-rings. Replace them with
new ones, if necessary. Ensure the O-rings are properly installed before reattaching
the ion block support.
Note:
The pilot pin in the ion block support must align with the notch on the ion
block.
9.
Secure the ion block by alternately tightening its retaining screws.
Reassembling the Source Components
1.
Visually examine the condition of the three, front, ion block support O-rings
(
). Replace them, if necessary. Be sure they are properly installed before
you proceed.
2.
Refit the PEEK seal ring and O-ring on the ion block.
3.
Press the extraction cone into the ion block support. Secure it with the PEEK
retainer and screw.
4.
Refit the sample cone and its O-ring into the cone gas nozzle. Secure all parts with
the cone gas spring clip and two 2.5-mm hex screws.
5.
Refit the ion block assembly to the PEEK support block. Secure it with two 6-mm
hex screws. Avoid overtightening.
6.
If you have cleaned only the sample and cone gas nozzles, turn the isolation valve
(
) back to
Open
.
7.
If you are using the APCI probe, replace the corona discharge needle
(
8.
Refit the PTFE tube to the cone gas nozzle.
9.
Close the source enclosure, reattaching its clip fasteners.
10. Refit the probe assembly, and reconnect the LC line.
11. Refit the center panel (
) on the front of the instrument.
12. Reconnect the front panel gas and electrical lines.
13. Evacuate the instrument, turn on the API gas, and check for nitrogen leaks around
the source enclosure.
Summary of Contents for Micromass ZQ 2000
Page 6: ......
