Metrohm 872 Extension Module Liquid handling - Manual (Page 47)

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
7 Operation and maintenance
872 Extension Module – Liquid handling
￭￭￭￭￭￭￭￭ 39
7.1.4 Shutting down
If the instrument is shut down for a longer period of time, the entire IC
system must be rinsed as follows to rid it of salts in order to prevent elu-
ent salts from forming crystals which may cause subsequent damage.
￭ rinse all capillaries and the Dosino with methanol/ultra pure water
(1:4),
￭ rinse all pump tubings of the peristaltic pump with ultra pure water.
7.2 Door
CAUTION
The door is made of PMMA (polymethylmetacrylate). It must never be
cleaned with abrasive media or solvents.
CAUTION
Never use the door as a handle.
7.3 Peristaltic pump
7.3.1 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 (19-10) 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.