INFICON Front Load Single Sensor - Manual (Page 69)

4 - 5
PN
07
4-
15
6N
Front Load Single and Dual Sensors Operating Manual
4.3 Sensor Maintenance
These maintenance requirements apply to the Front Load Single and Dual
crystal sensors.
4.3.1 Adjusting the Leaf Spring
Front Load sensors have two leaf springs with three prongs each:
 a leaf spring inside the sensor head cavity that provides an electrical
connection to the back of the ceramic retainer. This leaf spring is preformed and
heat treated, and should not require adjustment.
 a leaf spring on the ceramic retainer that provides an electrical connection to
the crystal electrode.
Examine the prongs on the leaf spring positioned on the ceramic retainer. If they
are significantly lower than shown by
Figure 4-3 , they should be adjusted to an
angle of approximately 45 degrees.
NOTE: A leaf spring adjusted to 45 degrees will flatten slightly after being inserted
into and extracted from the crystal holder.
Figure 4-3 Ceramic retainer
To adjust the prongs on the leaf spring positioned on the ceramic retainer, touch
the end of the prong with a gloved finger, or grip the prong with Teflon tweezers,
and gently lift it upward. Be careful not to kink the prongs. An ideal bend has a
smooth, sweeping shape as shown by
Figure 4-4 .
Figure 4-4 Leaf spring shape
Avoid
Kinking
Leaf
Spring
Leaf Spring
45°