Hanna Instruments HI 901 - Manual (Page 55)

5-15
METHODS
Number of Equivalence Points (HI 902 only)
The titrator can perform a titration with more than one equivalence point.
Up to 5 equivalence points can be detected.
End Point Determination
The first and the second derivative of the S-shaped titration curve can be used to detect the
equivalence point.
The equivalence point detection algorithm requires three more doses to be dispensed in the
analyte after the equivalence point is reached.
The reported end point volume is a calculated value based on a number of points around the
equivalence point.
The potentiometric S-shaped titration curve is the response in potential (mV) or pH between
the indication of the electrode versus cumulated addition of titrant. The graph takes the
shape of the S-character and can be expressed as mV or pH versus titrant volume.
The inflection point of the S-shaped titration curve is assumed to be the equivalence point of
the chemical reaction.