MICROCONTROLLER-BASED, LOW-COST DATA-ACQUISITION SYSTEM WITH A DOUBLE ADAPTIVE POLAROGRAPHIC ELECTRODE FOR MEASURING DISSOLVED OXYGEN IN WINE

Abstract

A microcontroller-based, low-cost data-acquisition system has been developed to measure dissolved oxygen in fluids, applied to wine, using polarographic electrodes in a Clark cell. The prototype consists of a sophisticated adaptation system to amplify correctly the low current that this type of sensor provides. The system compensates for the temperature effect in the measurement. This measurement system supports any type of polarographic electrode sensor because of its adaptive capabilities. It controls the time course of dissolved oxygen and stores the data for subsequent treatment. Furthermore, this system provides information in real time concerning the dissolved oxygen and electrolyte reserves, whereby the value can be recorded and controlled with the proper system of dosage/reduction of gas; also, the user is alerted to replenish the electrolyte when necessary. The system has been tested in real processes, and the results have been quite good.

Keywords:

• adaptive sensor
• data-acquisition system
• dissolved oxygen
• polarographic electrode
• wine