Metrohm 850 Professional IC Anion MSM-HC - LP-Gradient - Manual (Page 100)

5.11 High Capacity Metrohm Suppressor Module (MSM-HC)
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850 Professional IC Anion MSM-HC LP Gradient
5.11.3.3 Replacing parts of the MSM-HC
It may be necessary to replace parts of the MSM-HC 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-HC which cannot be eliminated (solutions can
no longer be pumped through the suppressor).
Both the MSM-HC rotor A (44-3) and the MSM-HC connecting piece
(44-2) with its supply and discharge lines can be replaced.
Replacing parts of the MSM-HC
Replace parts of the MSM-HC as follows (see Figure 44, page 88):
1 Disconnecting the MSM-HC from the IC system
￭ Switch off the instrument.
￭ Disconnect the MSM-HC from the separation column, peristaltic
pump and detector.
2 Dismantling the MSM-HC
￭ Unscrew union nut (44-1) from the MSM-HC housing (44-4).
￭ Pull the MSM-HC connecting piece (44-2) and the MSM-HC rotor
A (44-3) out of the MSM-HC housing (44-4). The connecting
piece and the MSM-HC rotor A normally stick to one another – if
this is not the case: Take a sharp object, insert into the slot (44-5)
in the MSM-HC housing, and pull out the MSM-HC rotor A (44-3)
in this way.
￭ Detach the MSM-HC connecting piece (44-2) from MSM-HC rotor
A (44-3).
3 Cleaning the new MSM-HC rotor A
￭ Clean the sealing surface of the new MSM-rotor A (44-3) with
ethanol using a lint-free cloth.
4 Inserting the new MSM-HC rotor A
Caution
An incorrectly inserted MSM rotor A (44-3) can be destroyed
during start-up.