IMPROVED ELECTRODE SYSTEM FOR DETERMINATION OF OXYGEN TENSION IN INDUSTRIAL APPLICATIONS

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Abstract
The development and mode of action of enclosed electrode systems for the polarographic measurement of oxygen concentration or tension is reviewed and discussed. The improved electrode system has a cathode of 99.99% pure gold, an anode of 99.99% pure silver and is enclosed by a membrane of polyethylene, polypropylene or Teflon. The merits of these various membrane materials are discussed. Polypropylene is one of the best all-purpose membranes. Other aspects of design and construction are discussed in detail. This probe is most suitable for measurement of oxygen tension, rather than oxygen concentration, in an agitated or flowing environment of liquid or gas. The performance characteristics of the probe compare very favourably with other available published data and it has all the requirements for use in industrial control loops. Only 5 min. are required to stabilize after switching on. Calibration against oxygen tension is linear. Response to change in oxygen tension may be as rapid as 5 sec. for 90% response to a step change from zero to 100% saturation. Much shorter times are required for response to the smaller changes normally encountered. The residual current of the system is normally less than 1% of the air saturation current, and can be completely nulled for use in very low oxygen tension ranges. The probe is unaffected by extremely high levels of suspended solids.

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