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Automation industry articles from ISA

Control_valve_primer_4th

A Control Valve Primer by Hans D. Baumann

Do you know what to look for in a good Control Valve Design?  Do you know what you should NOT do with control valves? Learn from Hans D. Baumann’s experience in his book:  Control Valve Primer: A User’s Guide Fourth Edition which covers topics such as flow characteristics, control valve installation, environmental concerns, valve sizing, fail-safe […]

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Fig. 1. Unity feedback control loop.

Design PID controllers for desired time-domain or frequency-domain response

Abstract: Practical requirements on the design of control systems, especially process control systems, are usually specified in terms of time-domain response, such as overshoot and rise time, or frequency-domain response, such as resonance peak and stability margin. Although numerous methods have been developed for the design of the proportional-integral-derivative (PID) controller, little work has been […]

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Finding the interface between two liquids in a tank is critical for some processes.

Measuring Level Interfaces

In other cases, an emulsion or “rag” layer will exist between the two liquids. Other interface situations include multiple interfaces between more than two products, or the interface between a liquid and a solid. In some cases, it may be necessary to measure the thickness of the upper layer. No one sensor can solve all […]

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ISA Communications Division to host Wireless Factory Automation Workshop

Market developments form the foundation of the premier ISA Wireless Factory Automation Workshop, with a focus of “The Last Meter – Leveraging economies of scale of mass market technologies to meet factory automation wireless communication needs at the edge of the architecture.” The ISA Communications Division will host this workshop on 16-17 April at the […]

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Fig. 1. Block diagram of a typical PID control system.

Robust PID controller design for non-minimum phase time delay systems

Abstract: A robust PID controller for a non-minimum phase system subject to uncertain delay time is presented in this paper. Utilizing the gain-phase margin tester method, a specification-oriented parameter region in the parameter plane that characterizes all admissible controller coefficient sets can be obtained. The PID controller gains are then directly selected from the parameter […]

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Fossil Fuel Committee Publishes Functional Requirements

Organizations that operate fossil fuel plant control room simulators deal with different operator and training practices. Yet they share common goals when it comes to personnel safety, maximum equipment availability and lifetime, and ensuring efficient operations. When the ISA77.20 subcommittee reviewed the existing standard, ANSI/ISA77.20.01, Fossil Fuel Power Plant Simulators: Functional Requirements, they updated many […]

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security hand on keyboard

Uninterruptible Power Supply Technology and Cybersecurity

The recent number of cyber-attacks and their level of sophistication have demonstrated the inadequate network security measures employed by many large corporations, government, and military agencies. Time is on the hackers’ side. They only have to find one unsecure computer or device on a segment of a corporate or governmental network, and they can use […]

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