Metrohm 700 Dosino - Manual (Page 30)

3. The Dosino in practice
700 Dosino, Instructions for Use
24
1
4
3
Port 4
Port 1
Port 3
Port 2
Simplified functional diagram
• The dosing cylinder with the stopcock washer
in the cylinder base is coupled to the center-
ing tube.
• The centering tube is loosely seated on a
distributor fitted with four different channels.
These channels lead to the different ports.
• The dosing drive with its carrier rotates the
centering tube and therefore the stopcock
washer. This results in movement to a par-
ticular valve setting.
• The dosing motor of the drive moves the
dosing piston by means of a push rod and in
this way ejects or aspires liquid from or into
the cylinder via the selected port.
Port assignment
The distributor of a dosing unit has freely addressable in-
puts/outputs (ports) and an additional connection (Port 0) which
leads directly to the lower surface of the distributor. This Port 0,
which cannot be addressed by the 4-way valve, is used for venting
the storage container and can be fitted with an adsorber tube.
Dosing unit distributor seen from below
Port 1
Port 0
(venting the
bottle)
Port 3
Port 4
Port 2
dosing cylin-
der
4-way valve