petrochemical co-workers working in the plant

Promoting Operator Effectiveness

Operator effectiveness is often an overlooked area that can improve the performance and safety of your control system or plant. Yet operator effectiveness is one of the key elements for running a safe, efficient, and profitable plant. Research shows worldwide process industry losses because of unscheduled downtime and poor quality can exceed $20 billion. Of […]

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The key MEMS sensors today are accelerometers, gyroscopes, and pressure sensors.

Making Sense of Micro Electro Mechanical Systems or MEMS

Micro Electro Mechanical Systems (MEMS) describe a type of device or sensor as well as a manufacturing process. MEMS sensors incorporate tiny devices with miniaturized mechanical structures, typically ranging from 1-100 μm (about the thickness of a human hair), while MEMS manufacturing processes provide an alternative to conventional macro-scale machining and assembly techniques. MEMS development […]

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Fig. 1. Input vector for TITO process.

Guidelines for the tuning and the evaluation of decentralized and decoupling controllers for processes with recirculation

Abstract: This paper gives guidelines for the pairing, the time response specification, and the tuning for processes with recirculation when decentralized controllers are used. This selection is based on the condition number, which is an indicator of the process directionality, and on the generalized dynamic relative gain (GDRG), which is a measure of the interaction. […]

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Auto-Tuning Takes Too Long – Now What?

In the ISA Automation Week Mentor Program I am providing guidance for extremely talented individuals from Argentina, Brazil, Malaysia, Mexico, Saudi Arabia, and the USA. We will be sharing a question and the answers each week. If you would like to provide additional answers, please send them to Susan Colwell at ISA. This question is […]

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Security standards committee completes ballot

The ISA99 committee recently completed a ballot on the standard, ISA-62443.03.03 (99.03.03), Security for Industrial Automation and Control Systems: System Security Requirements and Security Assurance Levels. Closing on October 27, 2011, the ballot passed with 18 approval votes and five disapproval votes. Reflecting the widespread interest in the draft, more than 500 comments were received […]

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