Metrohm 850 Professional IC Anion MSM-HC - LP-Gradient - Manual (Page 101)

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5 Operation and maintenance
850 Professional IC Anion MSM-HC LP Gradient
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￭ Insert the new MSM-HC rotor A (44-3) in the MSM-HC housing
(44-4) in such a way that the tubing connections on the rear of
MSM-HC rotor A fit into the corresponding recesses inside the
MSM-HC housing and one of the three holes of MSM-HC rotor A
is visible from below in the slot (44-5) of the MSM-HC housing.
￭ If the MSM-HC rotor A (44-3) is correctly inserted, its sealing sur-
face will be approx. 4 mm within the MSM-HC housing (44-4). If
this is not the case, the MSM-HC rotor A must be moved into the
right position from below using a sharp object (e.g. screwdriver).
5 Cleaning the MSM-HC connecting piece
￭ Clean the sealing surface of the MSM-HC connecting piece (44-2)
with ethanol using a lint-free cloth.
6 Inserting the new MSM-HC connecting piece
￭ Insert the MSM-HC connecting piece (44-2) into the MSM-HC
housing (44-4) in such a way that the connector 1 is on top and
the three pins of the connecting piece fit into the corresponding
recesses on the MSM-HC housing (44-4).
￭ Reattach the union nut (44-1) onto the coupling and tighten.
7 Connecting and conditioning the MSM-HC
￭ Reconnect the MSM-HC to the IC system.
￭ Before switching the MSM-HC over for the first time, rinse the
three suppressor units with solution for 5 minutes.
5.12 Peristaltic pump
5.12.1 Operation
The pumping capacity of the peristaltic pump depends on the drive speed
(set via software), the contact pressure and, above all, the internal diame-
ter of the pump tubing. Depending on the application, different pump
tubings are used.
Caution
The service life of the pump tubings also depends on the contact pres-
sure. Therefore fully lift the tubing cartridges by loosening the snap-
action lever (31-10) on the right-hand side if the peristaltic pump is to
be turned off for a longer period. Once set, the contact pressure
remains unaffected.