Metrohm 850 Professional IC Anion MCS Gradient - Manual (Page 101)

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4 Operation and maintenance
850 Professional IC –Anion – MCS – Gradient
￭￭￭￭￭￭￭￭ 91
4.11.3.3 Replacing parts of the MSM
It may be necessary to replace parts of the MSM in the following cases:
￭ Loss of suppression capacity which cannot be eliminated (reduced
phosphate sensitivity and/or significant rise in the baseline).
￭ Blockage of the MSM which cannot be eliminated (solutions can no
longer be pumped through the suppressor).
Both the MSM rotor A (46-3) and the MSM connecting piece (46-2) with
its supply and discharge lines can be replaced.
Replacing parts of the MSM
Replace parts of the MSM as follows (see Figure 46, page 89):
1 Disconnecting the MSM from the IC system
￭ Switch off the instrument.
￭ Disconnect the MSM from the separation column, peristaltic
pump and detector.
2 Dismantling the MSM
￭ Unscrew union nut (46-1) from the MSM housing (46-4).
￭ Pull MSM connecting piece (46-2) and MSM rotor A (46-3) out of
the MSM housing (46-4). The MSM connecting piece and MSM
rotor A normally stick to one another - if this is not the case: Take
a sharp object, insert into the slot (46-5) in the MSM housing,
and pull out MSM rotor A (46-3) in this way.
￭ Detach the MSM connecting piece (46-2) from MSM rotor A
(46-3).
3 Cleaning the new MSM rotor A
￭ Clean the sealing surface of the new MSM rotor A (46-3) with
ethanol using a lint-free cloth.
4 Inserting the new MSM rotor A
Caution
An incorrectly inserted MSM rotor A (46-3) can be destroyed
during start-up.