Injection Valve - Metrohm 942 Extension Module Vario Manual

3.9 Injection valve

3.9 Injection valve
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Connecting the pulsation absorber
1 Unscrew the threaded stopper from the outlet of the pulsation
absorber.
2 Screw one end of the capillary (6.1831.010) to the outlet of the pul-
sation absorber using a short pressure screw (6.2744.070).
Screw the other end of the capillary to the injection valve of the IC
instrument using a pressure screw (6.2744.010).
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 sample solution injected is determined by:
the volume of the sample loop or
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The choice of sample loop depends on the application. The following
sample loops are normally used:
Table 1 Which sample loop do I need?
Application
Cation determination
Anion determination with suppression
Anion determination without suppression
MiPT, MiPuT
MiPCT, MiPCT-ME
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Preconcentration
942 Extension Module Vario ONE/Deg (2.942.1060)
Sample loop
20 µL
20 µL
100 µL
250 µL
column