Metrohm 881 Compact IC pro – Anion – MCS - Manual (Page 94)

5.10 Injection valve
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881 Compact IC pro – Anion – MCS
3 Determining "Sample B"
Let "Sample B" pass through the sample path for the duration of the
rinsing time, then inject and measure.
4 Calculating the sample carry-over
The degree of the sample carry-over corresponds to the ratio of the
peak areas of the measurement for sample B to the measurement for
sample A. The lower the ratio, the lower the sample carry-over. This
ratio can be modified by varying the rinsing time – thus allowing the
rinsing time required for the application to be ascertained.
5.10 Injection valve
5.10.1 Protection
To prevent contamination of the injection valve, a 6.2821.120 inline filter
(see Chapter 3.11, page 35) should be mounted between the high pres-
sure pump and the pulsation damper.
5.11 Peristaltic pump
5.11.1 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.