Metrohm 881 Compact IC pro – Anion - Manual (Page 95)

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5 Operation and maintenance
881 Compact IC pro – Anion
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5.11.3.3 Cleaning the suppressor
In the following cases, it may be necessary to clean the suppressor:
￭ Increased backpressure onto the connection tubings of the suppres-
sor..
￭ Blockage of the suppressor which cannot be eliminated (solutions can
no longer be pumped through the suppressor).
￭ Jamming of the suppressor which cannot be eliminated (suppressor
can no longer be switched over).
Cleaning the suppressor
Clean the suppressor as follows:
1 Disconnecting the suppressor from the IC system
￭ Switch off the instrument.
￭ Disconnect all capillaries of the suppressor from the IC system.
2 Dismantling the suppressor
￭ Unscrew union nut (39-1) from the housing (39-4).
￭ Pull the connecting piece (39-2) and the rotor (39-3) out of the
housing.
The connecting piece and the rotor normally stick to one another
– if this is not the case: Take a sharp object, insert it into the slot
of the housing (39-5) and pull out the rotor in this way.
￭ Detach the connecting piece from the rotor.
3 Cleaning the inlets and outlets
￭ Connect in turn each of the 6 PTFE capillaries fastened on the
connecting piece (39-2) to the high pressure pump (see Chapter
3.10, page 31) and pump through ultrapure water.
￭ Check whether solution emerges at the connecting piece. If one
of the inlets or outlets remains blocked, the connecting piece
must be replaced (order number 6.2835.010) (see "Replacing
parts of the suppressor", page 87).
4 Cleaning the rotor
￭ Clean the surface of the rotor (39-3) with ethanol using a lint-free
cloth.