Serinus 51 User manual 1.0
Service
59
6.4.8 Replace PMT desiccant pack
The PMT housing contains two desiccant packs to prevent condensation on the cooled
PMT housing. If the desiccant expires it will result in corrosion of the PMT housing
and premature cooler failure. It is recommended that the desiccant bags be changed at
least annually. If moisture is detected inside the housing or the desiccant packs are
saturated the interval should be reduced. To change the desiccant packs perform the
following:
Caution
Because the PMT is extremely sensitive to light, it
is essential that before opening the PMT assembly
to make sure that the analyzer is switched off.
In addition, even when the analyzer is switched
off it is very important to cover the PMT at all
times so that no direct light reaches its window.
1. Turn the analyzer off and disconnect power.
2. Using an offset Phillips head screwdriver, remove the desiccant pack
access cap from the PMT housing.
Note
Removal of the desiccant access cap may be
easier if the Rx cell/PMT housing is removed
from the analyzer. Refer to section 3.3.8.
3. Remove the old desiccant packs and replace with new (see Figure 27).
Do not attempt to dry and reuse the old packs.
Figure 27 Position of desicant packs
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