Metrohm 940 Professional IC Vario ONE/SeS/PP/Prep 3 - Manual (Page 38)

3.12 Injection valve
￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
28 ￭￭￭￭￭￭￭￭
940 Professional IC Vario ONE/SeS/PP/Prep 3 (2.940.1530)
3.12 Injection valve
The injection valve connects the eluent path to the sample path. By a
quick and precise switching of the valve a defined quantity of sample solu-
tion is injected and flushed to the separation column with the eluent.
The quantity of injected sample solution is determined either by the vol-
ume of the sample loop or by an 800 Dosino, if Metrohm's intelligent par-
tial loop injection techniques (MiPT) are being used. For these techniques,
a large sample loop is used, but it is only filled part way.
The choice of sample loop depends on the application. The following
sample loops are normally used:
Table 1 Which sample loop do I need?
Cation determination 10 µL
Anion determination with suppression 20 µL
Anion determination without suppression 100 µL
MiPT 250 µL
The injection valve is completely connected. No installation work is
required.
Optional: Exchanging the sample loop
The sample loop can be replaced to match the application (see Table 1,
page 28).
NOTE
Only use PEEK pressure screws (6.2744.010) to connect capillaries and
the sample loop to the injection valve.