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6.6.3 Cleaning the In-line Filter (High Pump Pressure)
This filter keeps large particles from plugging the outlet to waste from the fractionation cartridge.
It may plug on occasion causing high backpressure, and may need to be cleaned. It is cleaned as
follows:
1.
Open the door of the instrument and locate the filter next to the fractionation cartridge as
seen in the drawing below.
Fig. 6.21. Cartridge In-Line filter.
2. Using a wrench, loosen the connections on both ends of the filter, and remove the filter from
the instrument.
3. The filter consists of a small metal piece screwed into a larger metal piece. The smaller metal
piece contains the filter element. Unscrew the smaller piece and remove it from the larger piece.
4. Remove the fritted stainless steel filter element from the piece you just unscrewed.
5. If you analyze polymer samples, unplug the filter element by sonicating the element in acetone
or tetrahydrofuran for at least 15 minutes. If you analyze silica or other inorganic substances,
sonicate the element in a 50/50 (by volume) mixture of methanol and 1M NaOH for at least 15
minutes.
6. Re-install the filter in the reverse order of the steps above.
7.
Cleaning the filter may also be performed by backflushing, as described in section 5.1.1.
8.
If cleaning the filter element fails, you can replace the filter element with a new unit.
In-Line filter
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