This book has been designed as a textbook for the students of electronics and instrumentation engineering, instrumentation and control engineering, mechatronics engineering and chemical engineering courses. The first edition of the book covered mainly the mathematical modelling of various processes, controller characteristics and tuning, multi loop controls, final control element and selected unit operations. Due to popular demand and readership feedback, two more chapters, namely signal conditioning and digital controllers-computer- based control, have been added to this edition. The book is an outcome of the author's vast hands-on experience in industry and his rich academic background. This new edition is an extremely useful text for students and faculty as well as a very good reference for practising process control professionals in industry.