Metrohm 711 Liquino User Manual
Page 42
3.2 Tutorial
711 Liquino, Instructions for use
36
<ENTER>
<ENTER>
<ENTER>
di l ut i on vol . 3 mL
•
The dilution volume is the amount of solvent to be added to the meas-
uring cell after the sample has been transferred there (in the example 3
mL). Press <ENTER> to accept the value.
Di spl ay:
>SMPL sampl i ng oper at i on
sampl e r i nse vol . 3 mL
•
Before the actual sample transfer the Dosino cylinder is rinsed with the
sample. This rinsing volume should be about the same as the transfer
amount (in the example 3 mL). For a multiple determination, in which
the same sample is always used, this volume can also be smaller.
Press <ENTER> to accept the value.
Di spl ay:
>SMPL sampl i ng oper at i on
sampl e r i nse r ep. 1
•
Enter how often the cylinder is to be rinsed with the sample. If samples
are being transferred which do not greatly differ from one another 1
rinse is sufficient. Press <ENTER> to accept the value.
QUIT
NO
•
As the remaining parameters in this submenu can be left at their preset
values it can be exited with the <QUIT> key.
Di spl ay:
par amet er s
>SMPL sampl i ng oper at i on
J
<ENTER>
<ENTER>
<ENTER>
<ENTER>
<ENTER>
•
The next submenu is accessed with <>.
Di spl ay:
par amet er s
>SMPL meas. cel l r i nsi ng
•
Press <ENTER> to open the submenu ‘SMPL meas.cell rinsing.
Di spl ay:
>SMPL meas. cel l r i nsi ng
ext er nal Pump: of f
•
The cell can also be rinsed with external pumps. However, the same
Dosino is to be used here. Press <ENTER> to accept the default val-
ue ‘off’.
Di spl ay:
>SMPL meas. cel l r i nsi ng
r i nsi ng r epet i t i ons 1
•
Enter the number of times that the measuring cell is to be rinsed. As
this process takes a considerable time this value should be kept as low
as possible. In this example 1 rinse is sufficient. Press <ENTER> to
accept the value.
Di spl ay:
>SMPL meas. cel l r i nsi ng
aspi r . vol ume 40 mL
•
The suction volume corresponds to the sample volume + dilution vol-
ume (solvent) + titrant consumption. The value must be so large that
the measuring cell is completely emptied after the titration. In this case
the total volume amounts to 40 mL. Press <ENTER> to accept the
value.
Di spl ay:
>SMPL meas. cel l r i nsi ng
aspi r . r at e max mL/ mi n
•
This setting is left at ‘max’. It only requires alteration for viscous liquids.
Press <ENTER>.