wtw PurCon IS sample preparation Operating Manual page 7

PurCon IS
BubbleClean procedure
for the self cleaning
ba43133e06 05/2009
The filter unit is immersed in the sample. The filter unit has 2 or 4 filters
depending on the version. The front and back of the filter are used as
a filter membrane. The sample is sucked into the inside of the filter by
the permeate pump of the control unit. The filtered sample ("permeate")
is forwarded to the analyzer by the control unit.
A powerful jet of air is blown onto the outside of the filter from below.
This forces a continuous flow of sample that inhibits the pollution of the
filter membrane. This considerably reduces the overheads for cleaning
the filter.
The filter unit is connected with the control unit via the permeate suction
pipeline. Amongst other things, the control unit contains the air com-
pressor for the self cleaning and the permeate pump (see section
1.2.2 C ).
ONTROL UNIT
Introduction
55