Hanna-instruments HI 84502 Manual do Utilizador Página 7
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7
PRINCIPLE OF OPERATION
The determination of total acids in wine is made according to a neutralization reaction, that is the
reaction between the acids found in wine and a base.
Titratable acidity is measured on a degassed sample at the end-point of 8.20. The results are
expressed as g/L tartaric acid.
For precise results it is very important to know the sample volume, titrant volume and concentration.
The dosing pump reproducibility is independent of the titrant tubing, therefore it doesn’t need
frequent calibrations. The calibration of the pump is necessary in order to have high accuracy for the
titrations.
The calibration procedure is based on the analysis of a known solution. By doing this, the instrument
makes a differential analysis between the standard and the wine sample. The minititrator will
calculate the concentration of the titrant based on the amount needed to reach the end point.
REQUIRED REAGENTS
Code Description
HI 84502-50 Titrant
HI 84502-55 Calibration Standard
- HI 84502 1
- TABLE OF CONTENTS 2
- PRELIMINARY EXAMINATION 3
- GENERAL DESCRIPTION 4
- SPECIFICATIONS 6
- PRINCIPLE OF OPERATION 7
- FUNCTIONAL DESCRIPTION 8
- TITRATOR STARTUP 10
- SETUP MENU 11
- GUIDE TO DISPLAY CODES 15
- ELECTRODE PREPARATION 18
- DOSING PUMP INSTALLATION 24
- DOSING PUMP PRIME PROCEDURE 24
- PUMP CALIBRATION PROCEDURE 26
- TITRATION PROCEDURE 28
- TROUBLESHOOTING GUIDE 38
- PREPARATION PROCEDURE 40
- STORAGE PROCEDURE 41
- PERIODIC MAINTENANCE 41
- PROBE MAINTENANCE 41
- ACCESSORIES 42
- WARRANTY 43
- MAN84502 10/12 44
- Printed in EUROPE 44
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