Metrohm 789 Robotic Sample Processor XL - Manual (Page 87)

3.4 Commands
Metrohm Sample Processor, Operation 79
The DOS command is used for controlling Dosimats and Dosinos. Up
to 3 Dosinos or Dosimats can be addressed individually or simultane-
ously via the MSB bus control.
The 1st parameter selects the dosing device and the corresponding
dosing port, at which the required function is to be carried out. If '*' is
entered then the default port for the corresponding function will be used
(e.g. dosing port = 1, filling port = 2, etc.)
Please note
After dosing the Sample Processor will not automatically fill the
dosing cylinder. If required, this can be programmed with the com-
mand DOS: 1.* : fill , see below.
It is possible to enter the volume to be added directly as the 2 nd pa-
rameter or to carry out specific functions of a Dosino. Negative volumes
can also be added, i.e. a certain volume can be aspirated and then
ejected again (pipetting). The minus sign is entered with the <*> key.
The functions listed below are used for complex liquid handling tasks
such as pipetting.
Dosing functions:
fill Fills the Dosimat and Dosino cylinder.
release Prepares the Dosimat or Dosino for changing the Ex-
change/Dosing unit. The dosing cylinder is filled via the
rinse port. The stopcock is turned to the exchange posi-
tion (Port 2).
prepar. Preparation cycle (PREP) for Dosinos. All tubing is rinsed
and filled completely.
empty Tubing system and Dosino cylinder are emptied.
eject Complete Dosino cylinder contents are ejected.
endVol Ejects the cylinder content to the max. volume mark.
compen.
Cancels the mechanical play between the dosing piston
and spindle.
In the parameter menu under
>Dosing unit def.
the port assignments
of the Dosinos as well as the dosing and filling rates can be defined for
specific methods. This can also be carried out in a sequence with the
appropriate DEF command.
More details about Dosino commands are given on p. 101ff.
The Sample Processor automatically recognizes whether a Dosimat or
a Dosino is connected.