Hanna Instruments HI931, User Manual

Page: 76 / 218

5-18
TITRA
TION METHODS
5.5.8. PRE-TITRATION VOLUME
During a titration, the equivalence point is reached after many titrant doses. These doses take up extra time while having no
relevance for equivalence point detection.
Pre-titration volume adds a large initial dose to jump directly to the proximity of the equivalence point.
This first dose occurs after the pre-titration stir time is completed.
The ranges for pre-titration volumes are shown below:
0.001 to 4.750 mL for a 5 mL burette
0.001 to 9.500 mL for a 10 mL burette
0.005 to 23.750 mL for a 25 mL burette
0.005 to 47.500 mL for a 50 mL burette
To disable a pre-titration volume, enter 0.000 mL.
Note:
A pre-titration volume is highly recommended whenever possible. Fewer doses will considerably shorten the overall titration
duration.
5.5.9. PRE-TITRATION STIR TIME
Option: 0 to 180 seconds
When enabled, the sample is mixed for a set period of time before any titrant is added. This allows the sample to become
homogeneous.
The
Pre-Titration Stir Time
option is disabled if 0 seconds is entered.