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From Measurement and Control Basics Fourth Edition
Introduction The losing company in the competition for the Air Force contract was
© 2007 ISA
Products & Services
Pressure sensors include all sensors, transducers and elements that produce an electrical signal proportional to pressure or changes in pressure.
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Temperature instruments use contact or noncontact methods to measure temperature. Products include dial, digital, industrial and laboratory thermometers; temperature probes, indicators, and sensors; RTD elements and transmitters; and thermistors, thermocouples, thermopiles, and thermal switches.
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Resistive temperature device (RTD) elements are wire windings or other thin-film serpentines that exhibit changes in resistance with changes in temperature. They are usually made of metallic elements or alloys such as copper, nickel, or nickel-iron.
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Level sensors are used to detect liquid or powder levels, or interfaces between liquids. There are two basic level-measurement types: continuous and point or multi-point.
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Noncontact infrared temperature sensors absorb ambient infrared (IR) radiation given off by a heated surface. They are used in applications where direct temperature measurement is not possible.
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Learn more about Noncontact Infrared Temperature Sensors
Product Announcements
Topics of Interest
L. Arnold
Johnson Yokogawa Corporation, Newnan, Georgia (Stand-Alone Controllers)
Douglas L. Butler
Solutia Inc., St. Louis, Missouri (Computers and Controls, Distributed Numerical Control...
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LEARNING OBJECTIVES FOR THIS CHAPTER
16 1 To develop open-loop and closed-loop transfer functions in the z domain for simple digital control systems.
16 2 To evaluate stability and...
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6.1 Objectives
As a result of studying this chapter, and after having completed the relevant exercises, the student should be able to:
Identify and describe the mathematical form of the most...
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11.2.1 Control Logic
Programmable Controllers. Plant engineers and technicians developed the first programmable
controller, introduced in 1970, in response to a demand for a solid-state...
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As hard as it is to imagine, electronics and computers haven’t been around forever, and neither has
automation equipment. The earliest “automated” systems consisted of an operator...
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