Metrohm 789 Robotic Sample Processor XL - Manual (Page 106)

3.8 Dosing and liquid handling
98 Metrohm Sample Processor, Operation
During the preparation process the dosing cylinder as well as the con-
nected tubing are completely filled. Several filling and dosing processes
are carried out. The volumes required for this are calculated from the
configuration settings of the Dosing unit, i.e. from the tubing lengths
and diameters (see Section 3.2.4).
The contents of the dosing cylinder is ejected via the selected port. The
standard PREP port (Port *) is that defined under
>dosing drive X
preparation port Y
(default: Port 1).
Empty
DOS: X.Y : empty mL Completely empties the dosing cylinder
and tubing
The tubing system and Dosing unit cylinder can be completely emptied.
The liquid in the dosing cylinder is ejected via the dosing port. The air
required to displace the liquid from the tubing is aspirated via the given
port. The standard port (Port *) for aspirating the air is that defined un-
der
>dosing drive X
drain port Y
(default: Port 4).
The standard dosing port can be altered under
>dosing drive X
dosing port Y
(default: Port 1).
Exchange Dosing unit
DOS: X.Y : release mL Prepares Dosino for exchanging the Dosing
unit.
Before changing the Dosing unit the release command must be used
to fill the dosing cylinder and move the stopcock to the exchange posi-
tion. The cylinder is filled by aspirating the necessary volume via the
given port. If * is entered as a wild card then the port given under
>dosing drive X
rinsing port Y
will be used (default: Port 2).