Metrohm 882 Compact IC plus – Anion – MCS - Manual (Page 48)

3.12 Injection valve
￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
38 ￭￭￭￭￭￭￭￭
882 Compact IC plus – Anion – MCS
2 Mounting new sample loop
￭ Fasten one end of the sample loop (18-2) with a 6.2744.010
PEEK pressure screw (18-7) to connector 3.
￭ Fasten the other end of the sample loop (18-2) with a second
6.2744.010 PEEK pressure screw (18-7) to connector 6.
3.12.2 Mode of operation of the injection valve
The injection valve (see Figure 19, page 38) can adopt two valve posi-
tions - FILL and INJECT. Switching back and forth between the two valve
positions determines whether the sample path or the eluent path is gui-
ded through the sample loop. The following figure provides a schematic
display of the flow paths of the two valve positions.
1 2
4 5
3 6
1 2
4 5
3 6
1 2
4 3
5
4 3
1 2
A B
Figure 19 Injection valve – Positions
A Position FILL B Position INJECT
1 Eluent input
Capillary coming from the high pressure
pump. 2 Eluent output
Capillary to the column.
3 Sample input
Sample aspirating capillary. 4 Sample output
Capillary to waste container.
5 Sample loop
Position A In the position FILL, the sample solution flows
through the sample loop to the waste container.
The eluent flows directly to the separation col-
umn at the same time.