MAX300-RTG : Hardware Manual Hardware Maintenance
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Visible deposits will usually be confined to the first 3/4 inch (2 cm) at the ionizer
end of the assembly, furthest from the wires that connect opposing poles.
Figure 45: Visible Deposits
The highlighted area in Figure 45 above shows visible deposits on one of the poles.
A similar deposit is present on the opposite pole. The most effective way of
removing deposits from the quadrupole is to scrub the affected area with a cotton
swab and paste of 95% pumice and 5% Alconox. Confine this scrubbing motion to
the circumference of the poles, avoiding scrubbing in a longitudinal direction. It is
very important to avoid scratching the quadrupoles.
When the deposits have been removed, the quadrupole will require a general
overall scrubbing using the pumice and Alconox paste. Use a brush of 3/4 to 1 inch
diameter inserted along the axis of the assembly. This brush should have the wire
knot at the end removed and the handle covered in plastic. Clean the inside of the
quad by rotating the brush.
Rinse the assembly thoroughly in tap water followed by distilled water. Watch for
the formation of a uniform, continuous film of water. Formation of individual
droplets indicates the presence of a hydrocarbon film and will require the assembly
to be cleaned again. When cleaning is completed, dry completely with a warm oven
or hair dryer and place on a clean surface for reassembly.
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