The effect of microfabrication techniques upon the development of micro processors has gone beyond the mere incorporation of micro processors into process analyzers. The micro lithography technique which was used to manufacture the micro processor is now being used to developed micro sensors. The sensors are small in size and can be mounted directly in a process and can send process information continuously and rapidly for process monitoring and control. The low cost and small size of these micro sensors would tend to predict the omnipresence of the micro sensor for the monitoring of compositions equal to that of the thermocouple for the monitoring of temperature. As with the development of any new technology the limitations and reliability of these new sensors need to be evaluated and carefully considered with each application.
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