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(9) Washing the Permapure dryer
The Permapure dryer is used for SO
2
measurement (2000 ppm or more).
The Permapure dryer has no moving sections nor consumable parts. If precautions in using it are suffi-
ciently respected, it can operate without maintenance usually. However, if its element has clogged, for
example, remedy it by the following method.
Fig. 10-8 Structure of Permapure dryer
(a) Disassembly
q Remove an O ring presser (one side).
w Loosen a shell joint (one side).
e Push the header inward and remove the tee.
r Loosen the other shell joint and gently pull out the element.
(b) Washing
q Carry out washing with tap water (detergent, alkali solution not allowed).
w On a side, remove the sample joint, cap and tee.
e Through the opposite port and purge port, introduce tap water at 127 kPa or lower pressure and
300 to 500 mN/min of flow rate.
r Carry out washing for longer or shorter time according to the degree of clogging.
If the clogging is slight, approximately 1 hour of washing is enough.
Sample
IN
Header
Element tube
O ring
Purge OUT
Shell
Shell joint
Purge IN
Purge joint
Sample
OUT
Sample joint
O ring presser
Tee
Element tube Permapure dryer
Tap water
Tap water
Fig. 10-9 Washing of Permapure dryer