Routine Maintenance
89
5
5.
Expose all parts to ultrasound for about 30 minutes. If you used formic acid in the
cleaning solution, rinse the parts well, immersing them in a beaker of water and
setting the beaker in an ultrasonic bath for about 20 minutes to remove all traces of
the acid. Then displace the water by immersing the parts in a beaker of methanol
and setting the beaker in the ultrasonic bath for 10 minutes.
6.
Carefully remove the parts from the beaker. Blow-dry them using inert, oil-free gas.
Alternatively, arrange the parts on lint-free towels and let them air dry. Wipe off water
spots with a lint-free cloth.
Removing and Cleaning the Hexapole Assembly
1.
Remove the 3-mm screws securing the ion block support, and remove the ion block
support from the pumping block. Remove any O-rings that remain stuck to the
pumping block surface (
2.
Use your hand to gently grasp the hexapole (
), and retract it carefully
from the analyser assembly.
Figure 5-13 Hexapole Assembly
3.
Bend a length of stainless steel tubing into a hook shape. Insert the hook into one of
the holes in the assembly’s rear support ring.
4.
Carefully suspend the assembly in a graduated cylinder. Add methanol to the vessel
until it covers the assembly.
5.
Place the graduated cylinder in an ultrasonic bath for 30 minutes.
Caution:
Be extremely careful when working with formic acid. Use a fume
hood and appropriate protective equipment.
STOP
Attention:
Never squeeze the hexapole rods together when you remove the
hexapole. Their orientation relative to one another is critical to the
instrument’s performance. Also, avoid scratching the bored surfaces of the
pumping block as you withdraw the hexapole.
Rear Support Ring
Alignment Notch
Summary of Contents for Micromass ZQ 2000
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