INFICON Cool Drawer Single Sensor - Manual (Page 52)

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Cool Drawer Single and Dual Sensors Operating Manual
4.5 Maintenance
4.5.1 Crystal Drawer Maintenance
In dielectric coating applications, the surface where the crystal contacts the crystal
drawer may require periodic cleaning. Since most dielectrics are insulators, any
buildup on the crystal drawer will eventually cause:
 erratic or poor electrical contact between the crystal and the crystal drawer.
 a reduction in thermal transfer from the crystal to the crystal drawer.
This will result in noisy operation and early crystal failure.
Clean the crystal drawer by ultrasonic cleaning in a soap solution and rinsing.
If necessary, gently buff the drawer (see
Figure 4-5 ) with a white Scotch-Brite ® pad
(1200 to 1500 grit) followed by an ultrasonic bath in soap solution and then by a
thorough rinsing in deionized water and drying.
The crystal drawer has a fine finish. This high quality finish is essential to provide
good electrical and thermal contact with the crystal.
CAUTION
Applying excessive force during cleaning or using overly
abrasive cleaning materials may damage the crystal
drawer finish and reduce sensor performance.
Figure 4-5 Crystal Drawer Cleaning
Clean or polish this surface.
Remove all oxides.
Do not scratch.