Metrohm 789 Robotic Sample Processor XL - Manual (Page 104)

3.8 Dosing and liquid handling
96 Metrohm 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.
Fig. 35 Dosing unit from below
VENT/0 – is used for venting the storage bottle and is normally fitted with an ab-
sorber tube (filled with a drying agent).
Port 1
– is side-mounted and is defined as dosing outlet 1 as standard.
Port 2
– is located on the base and is defined as the filling inlet as standard; it is
normally fitted with a standpipe.
Port 3 – is side-mounted and is defined as dosing outlet 2 as standard.
Port 4
– 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 >Dosing units ,
depend on the cylinder size:
Cylinder volume Max. dosing rate Resolution
2 mL 6.6 mL/min 0.2 μL
5 mL 16.6 mL/min 0.5 μL
10 mL 33.3 mL/min 1.0 μL
20 mL 66.6 mL/min 2.0 μL
50 mL 160 mL/min 5.0 μL
The following commands can be executed with Dosinos. For each
command the dosing drive and the Dosing unit port at which the com-
mand is to be executed can be entered. The addition of a particular
VENT/0
Port 3
Port 2
Port 1
Port 4