Shaw SDHmini - 11 Additional Information; Desiccant and Head Seal Replacement

11 Addional Informaon
11.1 Desiccant and Head Seal Replacement
Unscrew the four handle retaining screws using a hex socket drive.
Unscrew the four posidrive countersunk screws which hold the retaining
ring to the SDHmini.
The desiccant lled desiccant chamber can now be removed from the
sample chamber by fully retracng the desiccant chamber. Gently pulling
on the desiccant chamber a lile more, will pull the retaining ring out of
the sample chamber. The sample chamber is sll retained within the body
of the SDHmini.
Carefully place the knurled secon of the desiccant chamber top secon
with the desiccant base assembly uppermost.
Fully unscrew the desiccant head base assembly turning it anclockwise.
The desiccant head base may require slight loosening by placing in a so
jaw vice before this step is carried out. Do not fully unscrew with desiccant
chamber base secon at the boom, as this will spill desiccant.
Only use so jaws. Do not use tools or vice with hard jaws.
There is no need to remove the retaining ring from the desiccant chamber
top secon except perhaps to change an O-ring.
Dispose of used desiccant and rell with new, up to a level of 3 mm from
the boom of the screw thread.
Insert the desiccant chamber base assembly back into the relled
desiccant chamber top secon. Remember to ensure that the retaining
ring is in place and in the correct orientaon prior to reassembly by re-
ghtening the threaded parts.
Only use so jaws. Do not use tools or vice with hard jaws.
Insert desiccant head and retaining ring back into the sample chamber
pushing down squarely and rmly to push past the resistance of the O-ring
at the top of the sample chamber.
Push the desiccant chamber back into the sample chamber.
Align the countersunk holes in the retaining ring to the holes in the
housing and sample chamber within.
Reaach and ghten the four countersunk screws using the posidrive
screwdriver.
Reaach the handle using the four cap head M4 screws and the hex drive.
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