Dosing, Filling, Prepare – Metrohm 838 Advanced Sample Processor Manual User Manual
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2.8 Dosing and liquid handling
56
Metrohm 838 Advanced Sample Processor, Operation
Dosing command
The following functions can be executed with Dosinos. For each com-
mand the dosing drive and the Dosing unit port at which the command
is to be executed can be entered. The addition of a particular (positive)
volume and filling the cylinder are also possible with 685 and 805 Do-
simats.
If * is entered as wild card for the drive then the selected function will
be carried out by all the connected dosing devices.
If * is entered as wild card for the port then the particular function will
be carried out at the port defined as standard in the parameter menu
under
>def. Dosing units
. This means that this setting is method-
specific, but also applies to manual operation depending on the loaded
method.
Dosing
DOS: X.Y : xxx.xx mL
Adds a particular volume
The given volume will be ejected though the selected port. If a value
with a negative sign is entered then the volume will be aspirated.
The Dosing unit will not be refilled after each addition. The standard
dosing port (Port *) is that defined under
>dosing drive X
dosing port Y
(default: Port 1).
Filling
DOS: X.Y : fill mL
Fills the cylinder
The Dosing unit is filled completely. The liquid is aspirated via the given
port. The standard filling port (Port *) is that defined under
>dosing drive X
filling port Y
(default: Port 2).
Prepare
DOS: X.Y : prepar. mL
Prepares = rinses and fills the
connected tubing and the dos-
ing cylinder
The tubing system of the Dosino should be freed from air bubbles at
least once per day by carrying out a preparation cycle. This is a process
that could take some time.
It is recommended to use this command in a start sequence.
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