Metrohm 850 Professiona IC Cation Prep 1 - Manual (Page 91)

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4 Operation and maintenance
850 Professional IC –Cation – Prep 1
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4.9 Sample degasser
4.9.1 Operation
If you are working with sample degassing, the longer "transfer time" (see
Ascertaining the transfer time, page 79) means that it is also necessary to
rinse for longer (with the subsequent sample). The rinsing time should be
at least 3 times the "transfer time" so as to minimize the carry-over
effects. The "transfer time" itself depends on the pump capacity, total
capillary volume and volume of gas removed (i.e. the amount of gas in the
sample).
Note
When using the sample degasser, the rinsing time extends by at least 2
minutes.
4.10 Peristaltic pump
4.10.1 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 (25-10) 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.
Caution
The 6.1826.xxx pump tubings consist of PVC or PP and therefore must
not be used for rinsing with solutions containing acetone. In this case,
use other pump tubings or use another pump for rinsing.