INFICON Front Load Single Sensor - Manual (Page 88)

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Front Load Single and Dual Sensors Operating Manual
5.1.3.2 Crystal Holder and Ceramic Retainer Check
NOTE: The crystal holder connector on the Crystal Sensor Emulator will not fit
the sensor head cavity of older style INFICON sensors that have
“soldered” finger springs.
NOTE: Removal of the shutter may be required with a Front Load Dual sensor.
1 Remove the Crystal Holder from the sensor head.
2 Refer to Figure 5-8 . Connect the Crystal Sensor Emulator to the sensor head
at point C (sensor head cavity).
 If the Crystal Fail message disappears after approximately five seconds:
 Examine the Ceramic Retainer leaf spring (refer to section 4.3.1,
Adjusting the Leaf Spring, on page 4-5 .)
 Examine the crystal aperture and the crystal seating surface of the
Crystal Holder for material buildup (see
section 4.3.2, Cleaning the
Crystal Holder, on page 4-6 ).
 Install the Crystal Holder and verify that it is held securely in the sensor
head cavity. If the Crystal Holder is loose, refer to
section 4.3.4,
Replacing the Finger Spring, on page 4-8 .
 Try another new crystal.
 If the Crystal Fail message remains:
 Make sure the in-vacuum cable is tightly connected to the feedthrough
and sensor head coaxial connectors.
 Check for an intermittent in-vacuum cable by gently wiggling the
in-vacuum cable and then waiting at least five seconds to see if the
Crystal Fail message disappears.
 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.
3 If the cause of the Crystal Fail cannot be determined, proceed to section
5.1.3.3 .