A recently developed flow-through, yittria-stabilized zirconia (YSZ) pH sensor is presented. The Nemstian behavior and precision of the YSZ sensor was evaluated by comparing the potentials between the YSZ sensor and a Pt(H2) electrode. The results shows that this design is viable for pH measurements to an accuracy of about ±0.05 pH units, or about a factor of 2-10 better than it is normally achieved at temperatures above 300°C. A by-pass electrochemical system for on-line pH monitoring in industrial systems was designed. The system allows to in situ calibrate the pH sensors using the reference solutions and provide real-time monitoring of the pH of industrial hydrothermal fluids.

Subject
Sensors, Electrochemical cells, Diffusion, Tubes, Reference electrodes, Aqueous solutions, Supercritical water oxidation, Sodium chloride solution, Fluids, Ceramics, Electrodes, Electrode potential, High temperature
© 2001 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2001
Association for Materials Protection and Performance (AMPP)
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