This textbook is designed for students of different engineering streams (Electrical and Electronics Engineering, Electronics and Instrumentation Engineering, Instrumentation and Control Engineering, Applied Electronics and Instrumentation, Instrumentation Engineering, Mechanical Engineering and Chemical Engineering) offered in technical universities all over India. In this edition, author has explained common industrial processes and applications along with emphasizing on major scientific ideologies with help of exhaustive illustrations and explanatory examples. Fundamental topics of instrumentation—temperature, pressure, level, flow, control valves, controllers, and digital communication systems—have been covered extensively describing all the concepts and measuring instruments involved. Two major aspects of instrumentation industry are the installation procedures and safety measures involved, both of which have been highlighted as applicable in this scope of text.