Abstract
An investigation of the useful lifetimes of thick film sensors suitable for the measurement of various aqueous parameters is reported. Batches of sensor arrays designed to simultaneously measure temperature, conductivity, pH, dissolved oxygen and redox potential were investigated. In particular the device to device repeatabilitys of the pH and dissolved oxygen sensor elements were studied as it was found to be the characteristics of these elements that limit the device lifetimes. Errors of less than 5% for pH sensors and 10% for dissolved oxygen sensors were observed over periods of several months continuous immersion in water. An assessment of useful continuous immersion lifetimes was made for the sensors and possible sensor failure mechanisms are postulated.
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