INFICON Front Load Single Sensor - Manual (Page 71)

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Front Load Single and Dual Sensors Operating Manual
4.3.3 Adjusting the Crystal Holder Retainer Spring
If the ceramic retainer is not being retained securely by the crystal holder, or if the
ceramic retainer if difficult to insert, the retention force of the retainer spring in the
crystal holder can be adjusted by the following procedure.
Tools required

Scribe or other pointed tool
 Needle nose pliers (two required)
Procedure
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 and
either side of the exposed retainer spring, see
Figure 4-6 (a).
Figure 4-6 Location of the transition point
3 Using the scribe, gently remove the retainer spring from its groove in the
crystal holder.
4 Refer to Figure 4-6 (b) to determine the direction in which the ‘transition point’
must be relocated, to attain the desired retention forces. Moving this transition
point approximately 1.59 mm (1/16 in.) is generally sufficient.
5 Grasp the retainer spring, with the pliers, just below the transition point. Use the
second set of pliers to bend the retainer spring as illustrated by the dashed line
in
Figure 4-6 (c) to remove the existing transition point.
6 Use both pliers to form a new transition point according to Figure 4-6 (b),
thus returning the retainer spring to a shape similar to the solid line delineation
of
Figure 4-6 (c).
7 Reinstall the retainer spring into the groove in the crystal holder.
8 Determine if the retention force is acceptable and that the wire does not impede
crystal insertion. If needed, repeat the adjustment procedure.
Retainer Spring
Scribe
Crystal Holder
Move location of transition point in this
direction to decrease retainer retention force
Move location of transition point in this
direction to increase retainer retention force
Location of Transition Point
(a)
(b)
(c)