Metrohm 700 Dosino - Manual (Page 31)

3.1 Air bubbles are (almost) inevitable
700 Dosino, Instructions for Use
25
The standard assignment listed below applies to the following
Metrohm instruments; it cannot be altered:
• 726 / 796 Titroprocessor
• 736, 751 and 758 Titrino models
• 746 VA Trace Analyzer
• 756 KF-Coulometer
The standard occupancy of the Dosino ports:
Port 1 Dosing outlet; M6 threaded connection on the left-hand
side of the housing.
The liquid is ejected via dosing or titrating tip.
Port 2 Filling inlet; M6 threaded connection on the bottom of
the dosing unit.
The liquid is aspired from a storage container.
Port 3 Not assigned; M6 threaded connection on the right-
hand housing side.
Port 4 Special functions; slender connection nipple on the
bottom of the dosing unit.
This can be used with the
'PREP' function for ejecting
the liquid. When emptying the dosing unit port 4 is
used as the air inlet.
Port 0 Venting the storage bottle; M6 threaded connection at
the front. A drying tube can be connected here; this
can be filled with e.g. molecular sieve or soda lime.
Variable port assignments are possible with the following instru-
ments:
• 730 Sample changer (and successors)
• 711 Liquino
• 774 Oven Sample Processor
Ports 1 to 4 can be used bi-directionally here and are therefore
suitable for filling the dosing cylinder or dosing a liquid as required.
This means that complex liquid handling applications are possible.
If one of ports 1 to 3 is not in use then it should be closed
with a thread stopper (6.1446.040).
Never close Port 0 with a thread stopper when the dosing unit
is attached to a storage container. This could create a vac-
uum in the storage container – risk of implosion!