Metrohm 872 Extension Module Suppression - Manual (Page 43)

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872 Extension Module Suppression ￭￭￭￭￭￭￭￭ 35
5.4.4.3 Cleaning the suppressor
In the following cases, it may be necessary to clean the suppressor/SPM:
￭ Increased backpressure on the connection tubings of the suppressor/
SPM.
￭ Blockage of the suppressor/SPM which cannot be eliminated (solutions
can no longer be pumped through the suppressor/SPM).
￭ Jamming of the suppressor/SPM which cannot be eliminated (suppres-
sor/SPM can no longer be switched over).
Cleaning the suppressor
Clean the suppressor/SPM as follows:
1 Disconnecting the suppressor/SPM from the IC system
￭ Switch off the instrument.
￭ Disconnect all capillaries of the suppressor/SPM from the IC sys-
tem.
2 Dismantling the suppressor/SPM
￭ Unscrew union nut (11-1) from the housing (11-4).
￭ Pull the connecting piece (11-2) and the rotor (11-3) 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, inserti it into the slot
of the housing (11-5) 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 (11-2) to the high pressure pump and pump
through ultra pure 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 37).
4 Cleaning the rotor
￭ Clean the surface of the rotor (11-3) with ethanol using a lint-free
cloth.