5 Maintenance and Inspections
5.4 Maintenance and Replacement of the Filter
62 FPD-2010
7.
After checking contamination of the filter, confirm that the O-ring is free from deterioration and/or
damages. Deteriorated and/or damaged O-ring will result in stray light.
8.
If contamination of the filter cannot be removed by the above works or if the O-ring is deteriorated or
damaged, replace the filter unit.
9.
Mount the filter following the removal procedure in reversed order. If difference of height exists at the
connecting portion of the lens and photomultiplier, stray light may result. When mounting the
photomultiplier, adjust the height using screws at two locations on the shielding plate at the lower
portion of the photomultiplier so that no inclination will be made. (In most cases, it is not necessary to
change the height as the unit is so adjusted at installation that any inclination is eliminated.)
Make adjustment with screw
at these two places.
Shield plate
Fig. 5.4.6
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