Metrohm 711 Liquino - Manual (Page 34)

3.2 Tutorial
711 Liquino, Instructions for use 28
3.2.4 Changing the dosing unit
A dosing device consists of a dosing unit (the green part) with a dosing cyl-
inder (2, 5, 10, 20 or 50 mL) and the dosing drive, the Dosino 700. If you are
working with different reagents then you do not need a separate dosing
drive for each reagent bottle. Fit the individual reagent bottles with a dosing
unit (the actual buret) and simply mount the dosing drive connected to the
Liquino or dosing unit on a different reagent bottle as it is required.
Warning!
Incorrect disassembly of the dosing drive can damage the dosing unit
and/or the Dosino.
EXCH
6
N
• Always press the <EXCH> key first. Only in this way will the stopcock
of the dosing unit be moved to the safe, so-called 'exchange' position.
You can then loosen the dosing drive without any risk by carefully turn-
ing it counterclockwise and lifting it off. Observe the lines marked on
the front of the dosing unit when doing this.
If you do not use a dosing unit for a long time or want to change the reagent
we recommend that the dosing unit or the dosing cylinder and the tubing
are completely emptied. This can be carried out simply and conveniently by
means of the 'EMPTY' function.
MANUAL
MAN OFF
D
EMPTY
3
T
<1>, <2>
EXCH
6
N
• Check whether the dosing tip is immersed in a waste beaker. Use the
<MANUAL> key to switch to manual operation. Then press
<EMPTY>.
Di spl ay: empt y t o por t :
t i p( 1) or f l ask( 2) ?
• You can now select whether the cylinder contents of the dosing unit are to
be pumped back into the reagent bottle or discharged into a waste beaker
via the dosing tip. Select <1> or <2>.
• The contents of the dosing cylinder are now discharged and the tubing
emptied. Please remember that the contents of the dosing tubing at Port 1
will always be discharged via the dosing tip.
• To terminate the 'EMPTY' function the dosing cylinder is filled with air. After
pressing the <EXCH> key the dosing unit can now be carefully removed.