Transient measurement of dissolved oxygen using membrane electrodes

Abstract

Transient mode dissolved oxygen measurement has been studied using a specially constructed galvanic membrane electrode controlled by a microcomputer. A four-layer diffusion model was developed to describe the dynamic behavior of the electrode. The data interpretation method is based on on-line computer simulation and parameter estimation techniques. A user-friendly computer software package is also developed for calibration and measurement control. Both experimental and theoretical studies indicate that such measurement is less sensitive to fouling and changes in flow conditions than steady state operation of the electrode.