Abstract
An amperometric dissolved oxygen sensor based on potentiostatic operation has been designed and fabricated using thick film technology. Calibration of the sensor has shown a strong linear relationship with dissolved oxygen concentration. The devices have been bulk tested for long-term stability and good device to device repeatability has been observed within the batch. Results indicate that a repeatable response to dissolved oxygen levels can be obtained over a period of several months when intermittently powered. The device has been found to operate efficiently for at least 2 weeks when it is continuously powered in deionised water. Silver and copper deposits have been identified on the working electrode of such devices. It is shown that sensor failure occurs after 3 days when powered in tap water and that it is attributed to deposition on the membrane surface.
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