Metrohm 2.850.2230, Руководство пользователя, Страница: 61 / 150

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3 Installation
850 Professional IC–Anion – MSM-HC – MCS – LP Gradient
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51
Replacing the sample loop
The sample loop can be replaced, depending on requirements. For addi-
tional information concerning selection of the appropriate sample loop,
see Chapter 3.16.3, page 52 .
NOTE
Use only 6.2744.010 PEEK pressure screws for connecting capillaries
and sample loop to the injection valve.
1 Removing existing sample loop
￭
Loosen 6.2744.010 pressure screws at connector 3 and connec-
tor 6.
￭
Remove sample loop.
2 Mounting new sample loop
￭
Fasten one end of the sample loop (27- 2 ) with a 6.2744.010
PEEK pressure screw (27- 7 ) to connector 3.
￭
Fasten the other end of the sample loop (27- 2 ) with a second
6.2744.010 PEEK pressure screw (27- 7 ) to connector 6.
3.16.2 Mode of operation of the injection valve
The injection valve (see Figure 28, page 51) 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 28 Injection valve – Positions
A Position FILL B Position INJECT