Steris Inc.

Brian J DeSantis

Iain McVey

Jan J Lewandowski

Brian E Schindly

Karen L Thomas

An electrochemical sensor (A, A&prime;) is specific for the detection of peroxyacetic acid in a solution which also contains hydrogen peroxide. A potential is applied between a reference electrode ( &prime;) and a working electrode ( &prime;). A read voltage (FIG. ) is selectively pulsed across a counter electrode ( &prime;) and the working electrode. The current flowing between the working electrode and the counter electrode is dependent on the peroxyacetic acid concentration in the solution (FIG. ). By careful selection of the read voltage, the contribution of hydrogen peroxide to the current flow is virtually negligible. The sensor effectively measures peroxyacetic acid concentrations in the range generally employed in sterilization and disinfection baths (100-3000 ppm.).

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Chicago, IL, United States of America

Brian J DeSantis