Hanna-instruments HI 901 Manuale Utente Scaricare il pdf (Pagina 51)

5-11

METHODS

The allowed ranges for dosing volume are:

0.001 to 4.500 mL for a 5 mL burette

0.001 to 9.000 mL for a 10 mL burette

0.005 to 22.500 mL for a 25 mL burette

0.005 to 45.000 mL for a 50 mL burette

5.5.3.2 Dynamic Dosing

The titrant is added in volumes that depends on the proximity of the end point as shown in

the graph below.

The titrator determines the titrant dose by trying to maintain a certain potential change (delta E)

with each addition.

If the potential jump, after the titrant dose, is lower than the set delta E, the next dose

volume is progressively increased until max Vol is attained. If the potential jump is still lower,

the titration will continue with the max Vol doses.

If the potential jump, after the titrant dose, is higher than the set delta E, the next dose

volume is progressively decreased until min Vol is attained. If the potential jump is still

higher, the titration will continue with the min Vol doses.

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Hanna-instruments HI 901 Manuale Utente Pagina 51