Waters Xevo TQD Operator's, Overview And Maintenance Manual page 130

6. Fit the blanking plug seal to the ion block blanking plug. (Fit a new seal
if the old one has been disposed of.)
7. Fit the blanking plug to the ion block and finger tighten it.
8. Insert the combined 2.5-mm Allen wrench and cone extraction tool
through the hole in the blanking plug and use it to fully tighten the plug.
9. Using the needle-nose pliers to gently grasp the heat-shrink tubing on
the heater cartridge assembly, slide the assembly and the PEEK
terminal block into the ion block.
10. Use the combined 2.5-mm Allen wrench and cone extraction tool to
tighten the captive PEEK terminal block securing screw.
11. Ensure that the grooves for the cover seal, cone gas O-ring, and isolation
valve O-ring are free from dirt and debris.
If contamination is present, use 1:1 methanol/water, applied to a
Tip:
lint-free cloth, to carefully clean the grooves.
12. Fit the cover seal to the ion block, ensuring that it is correctly seated.
(Fit a new seal if the old one has been disposed of.)
13. Fit the cone gas O-ring to the ion block, ensuring that it is correctly
seated. (Fit a new O-ring if the old one has been disposed of.)
14. If the old isolation valve O-ring has been disposed of, soak a new O-ring
in isopropyl alcohol for a few minutes.
Rationale:
O-ring to the isolation valve.
15. Fit the O-ring to the isolation valve.
16. Fit the isolation valve to the ion block assembly, so that it is in the
closed position.
17. Fit the ion block cover plate to the ion block assembly, and then use the
combined 2.5-mm Allen wrench and cone extraction tool to tighten the 2
ion block cover plate captive securing screws.
4-54 Maintenance Procedures
To avoid damaging the heater cartridge assembly
Caution:
wires, do not bend or twist them when fitting the assembly to the
ion block.
Doing so lubricates the O-ring and aids your fitting the