Metrohm 2.850.2230, Manual, Page: 110 / 150

5.11 High Capacity Metrohm Suppressor Module (MSM-HC)
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100
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850 Professional IC–Anion – MSM-HC – MCS – 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 (50- 3 ) and the MSM-HC connecting piece
(50- 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 50, page 98) :
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 (50- 1 ) from the MSM-HC housing (50- 4 ) .
￭
Pull the MSM-HC connecting piece (50- 2 ) and the MSM-HC rotor
A (50- 3 ) out of the MSM-HC housing (50- 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
(50- 5 )
in the MSM-HC housing, and pull out the MSM-HC rotor A (50- 3 )
in this way.
￭
Detach the MSM-HC connecting piece (50- 2 ) from MSM-HC rotor
A (50- 3 ) .
3 Cleaning the new MSM-HC rotor A
￭
Clean the sealing surface of the new MSM-rotor A (50- 3 ) with
ethanol using a lint-free cloth.
4 Inserting the new MSM-HC rotor A
CAUTION
An incorrectly inserted MSM rotor A (50- 3 ) can be destroyed
during start-up.