Fig. 7 Dosing Unit From Below - Metrohm 838 Advanced Sample Processor Manual

VENT/0
Port 1
Port 2
Port 3
Port 4
Metrohm 838 Advanced Sample Processor, Operation
The Dosing unit has four ports (inlets/outlets) to which various functions
can be assigned. There is an additional outlet (VENT or 0) that is used
for venting the bottle on which the Dosing unit is mounted.
Port 1
Port 2

Fig. 7 Dosing unit from below

– is used for venting the storage bottle and is normally fitted with an ab-
sorber tube (filled with a drying agent).
– is side-mounted and is defined as dosing outlet 1 as standard.
– is located on the base and is defined as the filling inlet as standard; it is
normally fitted with a standpipe.
– is side-mounted and is defined as dosing outlet 2 as standard.
– is located on the base and is defined as the air inlet opening for empty-
ing the tubing system as standard.
The maximum dosing and filling rates, which can be entered for each
port of the Dosing unit in the configuration menu under
depend on the cylinder size:
Cylinder volume
2 mL
5 mL
10 mL
20 mL
50 mL
2.8 Dosing and liquid handling
Max. dosing rate
6.6 mL/min
16.6 mL/min
33.3 mL/min
66.6 mL/min
160 mL/min
Port 4
VENT/0
Port 3
,
>Dosing units
Resolution
0.2 µL
0.5 µL
1.0 µL
2.0 µL
5.0 µL
55