Metrohm 711 Liquino - Manual (Page 30)

3.2 Tutorial
711 Liquino, Instructions for use 24
3.2.3 Dosing and dispensing
This is where you learn the simplest functions of the Liquino: manual dosing
and dispensing.
Fit a reagent bottle with a dosing unit and a Dosino and connect the Dosino
to the Liquino. Select, e.g. connection socket '
Dos. 1' or 'Dos. 2' for this.
Now switch the 711 Liquino briefly off and then on again. In this way the in-
strument recognizes the connected Dosino.
Details about setting up dosing units can be found in section 6.1.2, page
143.
Now immerse the dosing tip, which must be connected to Dosino Port 1 by
tubing, in a rinsing beaker.
MANUAL
MAN OFF
D
• Switch the Liquino to the manual operating mode. Press the <MANUAL>
key.
Di spl ay: manual
r eady 0. 000 mL
DOS NR
SELECT
P
• Now use the <DOS NR / SELECT> key to select the connected dosing
device. On the 711 Liquino keyboard there are four LEDs. If you have con-
nected the Dosino to socket '
Dos. 2' then press the <DOS NR /
SELECT> key once so that the LED ' DOS 1' lights up.
PREP
4
L
<1>
• Prepare the dosing unit by pressing the <PREP> key.
The PREP function is used to rinse the tubing and fill the dosing cylinder
free from bubbles.
Di spl ay: wast e por t :
t i p( 1) or f l ask( 2) ?
•
Now select whether the rinsing volume of the reagent solution should be
discharged via the dosing tip (connected to Dosino Port 1) or returned to
the storage bottle (via filling Port 2 of the Dosino). Press <
1>.
Di spl ay: manual
PREP r unni ng. . .
• The tubing is now automatically rinsed with the required volume of
reagent. Excess reagent solution is discharged into the rinsing beaker.
Wait until the Liquino reports 'ready'.
• Now exchange the rinsing beaker for the vessel into which you wish to
carry out dosing.
DOSING
7
G
• Press the <DOSING> key.
Di spl ay: manual DOSI NG
r eady 0. 000 mL
START
Z • If you now press the <START> key and hold it down then dosing will take
place when the Dosino has switched the stopcock. You will notice that the
dosing speed increases slowly. If you release the <START> key and then
press it down again it will again start dosing at a slow speed which is
gradually increased.
This behavior can be very useful when you need to dose accurately, e.g.
to fill a volumetric flask up to the mark.