This textbook provides a detailed description of the operation of measurement devices and instruments. Large, full-color illustrations are used to detail fundamental theory and operating principles of instrumentation in industry. Common applications used in control of manufacturing and other processes are included to show the details of how to install instruments in control systems. Instrumentation covers industrial communications from traditional pneumatic to state-of-the-art digital and wireless communication systems, including fieldbus, Hart‚, and Ethernet. This textbook includes a new chapter on safety systems that addresses common safety devices and systems such as relief valves, rupture discs, burner control systems, hazardous location classifications, enclosures, and safety instrumented systems (SIS).