Metrohm 726 Titroprocessor - Manual (Page 162)

8.5 SEC
726 Titroprocessor, Instructions for use 156 156
Adjustment
Predefined parameter sets
slow | medium | fast
A selection can be made from three different sets of pa-
rameters for the simplified setting of the titration parame-
ters. Each of these sets includes proven controller settings
which are suitable for most requirements.
slow for extremely accurate titrations or for chemically
inhibited reactions requiring a lot of time
medium standard parameters for unproblematic
titrations, optimized for the commonest
applications
fast speed-optimized control parameters
for non-critical titrations
If the titration parameters have to be adapted for specific ti-
tration problems the different control parameters can be
altered individually.
The [Custom adjust] softkey opens a further dialog
window in which user-defined settings can be carried out
(see page 151).
Fill. rate
Buret filling speed
0.01 mL/min…150 mL/min | max.
At the end of a titration the buret is automatically filled. The
maximum value for the filling rate depends on the cylinder
size of the buret used.
Buret cylinder max. speed
1 mL 3 mL/min
2 mL 6 mL/min
5 mL 15 mL/min
10 mL 30 mL/min
20 mL 60 mL/min
50 mL 150 mL/min
A value up to 150 mL/min can also be entered for smaller
buret cylinders; however, when the method is carried out
the dosing speed will automatically be reduced to the larg-
est possible value. Whenever possible 'max' should be se-
lected, except for viscous reagent solutions for which too
rapid filling can cause a partial vacuum in the cylinder
(bubble formation!).
Temperature
Temperature setting or measuring mode
-170…25.0…500°C | auto | initial
The temperature can be automatically determined during a
titration with the aid of a Pt100/Pt1000 sensor or a com-
bined electrode with built-in temperature sensor and can be
used for automatic pH correction (if pH is being measured).
It is possible to record the temperature throughout a titra-