Sensors to measure process conditions and valves to influence process operations are essential for all aspects of engineering practice. Engineers want to design and operate processes that remain in safe conditions, produce the desired amounts of high quality products and are profitable. Therefore, engineers must provide measuring devices for key variables and valves (or other devices, such as variable speed electric motors) to influence of “steer” the process. This site provides educational material on sensors and valves for use in the process industries.
sensors and valves are important in all aspects of engineering, they assume
greatest importance in the study of automatic control, which is termed process control when applied in the process industries.
Process control deals with the regulation of processes by applying the
feedback principle using various computing devices, principally digital computation. Process control requires sensors for measuring
variables and valves for implementing decisions. Therefore, the presentation of this material
is designed to complement other learning topics in process control.
successful process control requires appropriate instrumentation, engineers should
understand the principles of common instruments introduced in this section. The descriptions in this section cover the basic
principles and information on the performance for standard, commercially available
instruments. Thus, selection and sizing
of standard equipment is emphasized, not designing equipment “from scratch”.
The Material in this document is gathered from a large array of public-domain sources, and it provides a good introduction to the principles of common instrumentations and a summary of they key features important for control application. However, many important sensors are not addressed here, and new equipment is becoming available. Therefore, readers should gather information used to specify, procure, install, and maintain industrial equipment from reliable and up-to-date sources, such as testing laboratories, engineering handbooks, professional and industrial organizations, and equipment suppliers
The following topics are addressed at this site.
8. Solved examples
Each section contains valuable introductory material and links to excellent
resources on the WWW for further study and solving open-ended problems in university
courses and industrial practice.
Many links to specific topics are provided
throughout this section. Perhaps, the best general public-domain (free)
resource is available as a download by clicking on this Figure
(Thanks to Tony Kuphaldt.)