Hanna Instruments HI 904 - Manual (Page 67)

5-9
METHODS
5.5.4 Pre-Analysis Stir Time
To avoid erroneous results or unreachable 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 5 and 1000 seconds. After the sample is added
to the reaction vessel the titrator will stir for the set period of time before any iodine is
generated / bromine is consumed.
5.5.5 Stirring Speed
The stirring speed can be set between 200 and 2000 RPM with a resolution of 100 RPM.
The stirrer will remain on, as long as the method is active. The speed can be adjusted at any
time by using the and keys when the stirrer is running.