INFICON Front Load Single Sensor - Manual (Page 83)

5 - 7
PN
07
4-
15
6N
Front Load Single and Dual Sensors Operating Manual
5 At the feedthrough, measure resistance between center contact and shield of
the BNC connector (refer to
Figure 5-1 ).
 If resistance is less than 1 Ω, electrical continuity is good.
 If resistance is more than 1 Ω, check the following before continuing to
step 6:
 Verify that in-vacuum cable connections to sensor head and
feedthrough are tight. Do not overtighten.
 Remove the crystal holder and examine the leaf spring inside the
sensor head cavity. The three prongs on the leaf spring should reach to
approximately 1 mm (0.039 in.) from the top of the sensor head cavity.
To check prong height, place a straight edge across the sensor head
cavity (as shown by
Figure 5-4 ). If the prongs are not high enough,
gently bend each prong upward using a gloved finger or plastic
tweezers.
Figure 5-4 Leaf spring
6 Reinstall the crystal holder with ceramic retainer into the sensor.
7 Measure resistance between center contact and shield of the BNC.
 If resistance is less than 1 Ω, electrical continuity is good.
 If resistance is more than 1 Ω, continue to step 8.
8 Disconnect the in-vacuum cable from the sensor head and remove the crystal
holder.