Metrohm 726 Titroprocessor - Manual (Page 52)

3.4 Buret Buret units
726 Titroprocessor, Instructions for use 46 46
3.4 Buret units
The definition of a buret unit is used to fix the parameters of different tubing
of exchange units and dosing devices. The tubing dimensions (length and
diameter)are used in order to calculate the optimal volumes for rinsing the
tubings and the buret cylinder. These definitions of the buret units are made
with the commands Prepare (PREP) and Empty (EMPTY only with
Dosinos), as well as the corresponding manual functions.
If the exchange and dosing units you use have different tubing dimensions
from the tubing supplied as standard then you must define your own type of
buret units.
Exchange units (for Dosimat 685) and dosing units (for Dosino 700) should
always be prepared before a sample series is carried out, i.e. completely
rinsed with reagent in order to ensure that all tubing is complete and
homogeneously filled without any air bubbles. In this way the greatest
possible accuracy which these extremely precise dosing systems allow is
achieved for every determination.
• If in a method the PREP or the EMPTY command (only for Dosinos) is
used then the name of the type of buret unit must be given.
PREP Tubing Default Dos. drive A1
• If the preparation of a buret unit (emptying only for Dosinos) is to be
carried out manually, (dialog page 'Devices & Manual Control',
see below) then the type of buret unit must also be given:
³ Dos. drive A1 700
³ Reagent HCl
³ Concentr. 0.1 mol/L
³ Tubing Default
³ Buret type 10.0mL
³ Piston position exchange
³ Dosing status ready