INFICON CrystalSix Sensor - Manual (Page 38)

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CrystalSix Operating Manual
between the crystal and the sensor body. This buildup will also cause a reduction
in thermal transfer from the crystal to the sensor body. Both of these will result in
noisy operation and early crystal failure.
Cleaning may be accomplished by gently buffing the crystal holder to crystal
seating surface with a white Scotch-Brite™ pad followed by an ultrasonic bath in
soap solution followed by thorough rinsing in deionized water and drying or by
ultrasonic cleaning and rinsing only.
NOTE: The crystal holder seating surface is machined to a very fine finish (16
micro inches rms). This high quality finish is essential to provide good
electrical and thermal contact with the crystal. Applying excessive force
during cleaning or using overly abrasive cleaning materials may damage
this finish and reduce sensor performance.
4.3 Retainer Spring Adjustment Instructions
Occasionally you may become dissatisfied with the way the ceramic retainer is
secured in the crystal holder. To alter the magnitude of the retaining force, use the
following procedure.
Tools required:
Š Scribe or other pointed tool.
Š Needle nose pliers (two required).
1 Position the crystal holder with the crystal aperture oriented downward.
2 Insert the point of the scribe between the inside edge of the crystal holder cavity
and one of the two wire segments that protrude into the crystal cavity (
Figure
4-1 -a).
3 Using the scribe, gently remove the spring from its groove in the crystal holder
cavity.
4 Consult Figure 4-1 -b to determine the direction in which the 'transition point'
must be relocated, to attain the desired retention forces. Moving this transition
point approximately 1/8" is generally sufficient.
5 Grasp the spring, with the pliers, just below the transition point. Using the
second set of pliers, bend the spring as illustrated by the dashed line in
Figure
4-1 -c to remove the existing transition point.