This book has been prepared keeping in view the abstractness of this science ""Process control"" and for better understanding of this subject for practising engineers, teachers and students of Instrumentation, Electrical and Electronics disciplines. The major topics of process control have been explained with greater lucidity by taking appropriate illustrative examples and more number of solved problems wherever required, for easier comprehension and quick assimilation of the subject. Also the subject matter has been carefully prepared to cater to the needs of multi-disciplined engineering students where process control systems, are an integral part of their curriculum. It explains the concepts of process control instrumentation with a touch of practicality supported by related mathematical background to make the reading journey interestingly instructive.