Hanna Instruments HI 903 - Manual (Page 73)

5-9
METHODS
5.5.4 Predispensing Amount
The titration time can be shortened by adding a large fraction of the titrant at the start of the
analysis, if the approximate water content of the sample is known.
The predispensing amount can be set to deliver between 1 and 90% of the titrant required
to reach the end point.
Setting the amount to 0% will disable the titrant predispensing feature.
5.5.5 Pre-Analysis Stir Time
To avoid erroneous results or unreacheable endpoints when analyzing samples with limited
solubility, the sample must be completely dissolved in the solvent prior to the start of a
titration.
The pre-analysis stir time can be set between 0 and 1000 seconds. After the sample is added
to the reaction vessel the titrator will stir for the set period of time before any titrant (excluding
predispensing) is added to the cell.