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Instrumentation and control system is the heart of all processing industries. No process can run without the aid of instrumentation. Therefore, sometimes it is said that instruments are eyes of process through which a process operators visualize the process behaviour. Instrumentation and control concepts have undergone a drastic change over the past few years. The book is meant for the graduate level course of Instrumentation and Process Control (Electrical & Electronics and Instrumentation & Control disciplines). The topics have been divided in 8 chapters. The first three are devoted to Transducers. In these chapters, stress has been given on Transducer Signal Selection, Pneumatic Transmitters, Smart Transmitters, Special Class Thermocouple, Nucleonic Level Gage, Electronic Level Gage & others. In the chapter on Telemetry, pneumatic transmissions have been added in addition to usual topics. In the chapter Process Control, three element control systems have been described through examples of Boiler Drum Level Control. And lastly in Recent Developments & Microprocessor Based Instrumentation System, development of PLC and distributed control system and instrumentation communication protocol have been described in greater detail with suitable examples. The book is a perfect match of instruments that are still in use and which have been recently developed.