The fourth edition of Chemical Instrumentation and Automation (Chemical Engineering Specialty) has been modified on the basis of basically maintaining the structure of the third edition. The content of chemical instrumentation and automation (chemical specialty) (4th edition) is divided into two parts. The first article is about chemical detection instruments, which tells the basic knowledge of detection instruments, focusing on the detection principles of pressure, flow, liquid level and temperature in industrial production and the corresponding instrument structure selection, and introduces the commonly used display instruments in factories. The second chapter is the basis of chemical automation. In addition to the knowledge of automatic control system in industrial production, the control objects, control instruments and devices that constitute the automatic control system are also introduced. On the basis of simple and complex control system, advanced control system and computer control system are introduced. Finally, combined with the production process, the control scheme of typical chemical unit operation is introduced. Chemical Instrumentation and Automation (Chemical Engineering Specialty) (4th Edition) can be used as a teaching material for chemical engineering specialty in higher vocational and technical colleges, junior colleges and adult continuing education, and can also be used as a teaching material for staff education schools, correspondence universities and night universities in chemical engineering, oil refining, metallurgy, light industry, forestry and other related enterprises and units, which can be used as a reference for technicians in the chemical industry.