Metrohm 862 Compact Titrosampler - Manual (Page 39)

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 4 Titration and automation sequences
862 Compact Titrosampler ￭￭￭￭￭￭￭￭ 29
4.3 Endpoint titration (SET)
Endpoint titration is a titration mode for rapid routine determinations to a
preset endpoint (e.g. titrations in accordance with special norms) and
titrations for which reagent overflow must be avoided. The titration termi-
nation at the endpoint takes place either drift-controlled or after a waiting
period. The volume dosed until the endpoint is used for calculating the
content of the sample.
t/s
EP
Continuous
dosing
Initial
dosing
V/mL
V/mL
U/mV
Control range
Figure 27 Reagent dosing for SET
4.4 Automation sequences
4.4.1 Dipping in special
This automation sequence is suitable for simple determinations.
No pump is required for rinsing or for aspiration of the sample vessels. The
titration head with electrode and burette tips is immersed in the filled rins-
ing beaker on the special beaker position after each determination. At the
same time, the rinsing solution is stirred.
If required, auxiliary solution can be added prior to the beginning of a
determination with a Dosimat/Dosimat plus.
A filled rinsing beaker should be placed on the special beaker position.
The individual steps:
￭ Move to the sample
￭ Lower the lift to work position
￭ Start the determination