4.4
Crystal check
If available, use the crystal check facility on your film thickness monitor to detennine the
condition of the crystal {and other parts of the crystal sensor). Further instructions on how to
check a crystal are contained in the instruction manual for you film thickness monitor.
4.5
Routine maintenance
.
Clean the aperture of the crystal head to prevent the build up of deposited layer.
Check the condition of the baseplate 'a ring when you fit or move the accessory.
Check the condition of the coaxial cable regularly. Replace the coaxial cable if it is damaged.
Check the condition of the filter in the leadthrough cooling-water connector and clean it if
necessary .
16
Water Cooled Crystal Holder
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