Metrohm 840 PC Control 5.0 / Touch Control - Manual (Page 284)

4.10 Dosing and liquid handling
272
PC Control / Touch Control
4.10.3 Preparing (PREP) and emptying (EMPTY)
Preparation is used to rinse the cylinder and the tubing. Empty is used
to empty the cylinder and the tubing. The empty command is only
available for Dosino-type dosing devices.
• Control device: Selects the control device (Titrando, USB Sample
Processor etc.) to which the dosing device is connected and which
is to be prepared or emptied. This button is only shown when sev-
eral control devices have been configured under System/Device
manager (see Section 3.10). The device names are always shown in
the selection list.
• Dosing device: Dosing device to be prepared or emptied. All dos-
ing device connections (MSB) are always shown.
• Titrant: Titrant with which the preparation or empty command is to
be carried out. The titrant can be selected from the list of titrants
which have been defined under System/Titrants. If intelligent ex-
change or dosing units are used then a check will be made in the
method sequence that the correct titrant is present in the connected
dosing device and whether the type of dosing device is correct.
With non-intelligent exchange or dosing units the cylinder volume is
checked. At the start of the command the validity of the titer and the
expiry date of the selected titrant will be checked as well as the GLP
test interval for the exchange or dosing unit. The tubing parameters
defined under System/Titrants for the selected titrant will be used
for preparing and emptying the exchange or dosing unit. The pa-
rameters for the preparation are also defined under Sys-
tem/Titrants. If no titrant has been defined then the standard tub-
ing parameters and the default parameters for the preparation will
be used (see Section 3.8.6).
• Cylinder volume to (PREP only): Select the port of the Dosino
where the titrant is ejected. This parameter is only active when the
titrant is not defined. If a titrant has been defined, the cylinder vol-
ume is ejected via the port defined as dosing port for prepar-
ing/emptying (see Section 3.8.6).
• Air inlet (EMPTY only): Select the port where the air is aspirated.
This parameter is only active when the titrant is not defined. If a ti-
trant has been defined, the port defined as special port is used (see
Section 3.8.6 ).
A detailed description of the preparation and emptying sequences is
given in Section 3.24.2, p. 182 and p. 183).