Metrohm viva 1.0 Manual - Manual (Page 502)

5.5 Method run subwindow
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490 ￭￭￭￭￭￭￭￭
viva 1.0
Selection Dosing | Fill | Aspirate | Eject to stop | Eject to
end volume | Exchange position | Change
port | Compensate
Default value Dosing
Dosing
The given volume is dosed. There is no automatic filling either before-
hand or afterwards.
Fill
The filling of the cylinder can take place at a freely selected port. The
valve disk then remains at the selected port.
Aspirate
With this function, liquid is aspirated from the specified port. As with
dosing, here too the cylinder is not filled automatically either before-
hand or afterwards. It should be possible to reach the volume to be
aspirated with a single piston stroke.
Eject to stop
With this function, the entire contents of the cylinder is expelled
through the specified port. The piston is pressed all the way down to
the stop, i.e. beyond the maximum volume marking at this time. This
function should only be carried out to eject any air bubbles present.
Eject to end volume
The entire contents of the cylinder is expelled through the specified
port. In contrast to the Eject to stop function, the piston moves to
the maximum volume mark, i.e. until it has executed 10,000 pulses.
This command should be used for pipetting functions for emptying the
cylinder.
Exchange position
With this function, the cylinder is first filled through the specified port.
The valve disk is then turned to Port 2 and the dosing drive can be
removed from the dosing unit.
Change port
With Change port, only a single turn of the spigot takes place at the
specified port, but no piston movement.
Compensate
Because of the fact that the dosing units are interchangeable, the cou-
pling of the Dosino piston rod (spindle) exhibits a low mechanical toler-
ance that can be noticed when the piston changes its direction of
movement. This tolerance can be compensated with the Compensate
function. A short piston movement is first made in the same direction
as the previous movement, which is then followed by a piston move-
ment in the reverse direction.