DESIGN AND PERFORMANCE EVALUATION OF SOME INDUSTRIAL INSTRUMENTATION USING THERMORESISTIVE SENSING ELEMENTS

Abstract

This dissertation deals with thosee theoretical and practical aspects of thexmoresistive semiconductor type elements which influence markedly the design and performance of instrumentation systems using these elements as sensors. The The re: istive elements considered In Part I of this work are the thermistors. After discussing exhaustively ; the D. c., a, c.. and transient characteristic of these elements, the various techniques of l .near sing, their inherently nonlinear characteristics,. have been considered in detail, The various industrial applications, classified on the basis of their different characteristics, have next been discussed with special emphasis on the design considerations.. The practical aspect, of this, part convey the design and fabrication of a gas analyser, proto-type model, and a dice. tal temperature and liquid level indicator. The latter by virtue of its simplicity, reliability reliabIlity and high speed of response has Potential applications in industrial control system.