ISA Transactions Volume 35, Number 3

This third issue of ISA Transacions for 1996 is a collection of articles about measurement and control systems in the process industries. The last five papers in this issue were presented at the World Batch Forum conference in Toronto, in May 1996.

The first article, by Mike Spencer, Steve Hutt, Fred Mintun, and Gary Wollner, "Instrument information management-the new paradigm," analyzes requirements for information and document management within instrumentation design and maintenance environments.

The second article, by David P. Lawrence, K.C. Tsui, and John Tucker, "Disturbance sensitivity reduction via velocity loop feedback," illustrates that velocity loop feedback can dramatically reduce a closed-loop servo control systems sensitivity to external disturbances.

The third article, by Jian-Guo Zhang, "Real-time communication networks based on optical fiber code-division multipleaccess scheme," proposes a code-division multiple-access (CDMA) network to guarantee real-time data communications. Optical signal processing can eliminate the speed limitation at electro-optic/optoelectronic interfaces.

The fourth article, by Raymond P. Champagne and Stephen J. Boyle, "Optimizing valve actuator parameters to enhance control valve performance," discusses computer-model use to assess dynamic performance of a control valve, actuator, and positioner assembly.

The fifth article, by Jean-Marie E. Vandeursen and Jan A. Peperstraete, "Modelbased and PID controllers for disturbance rejection in processes with time delay: a comparison," examines and compares the performance of several model-based controllers with that of a PID controller.

In the sixth article, by Karl-Erik Arzen and Charlotta Johnsson, entitled "Objectoriented SFC and ISA-S88.01 recipes," object-oriented sequential function charts are used to implement a batch control recipe management system.

In the seventh article, by E.H. Bristol, entitled "Redesigned state logic for an easier to use control language," a redesigned state logic control language allows a 3:1 reduction in the cost of application engineering.

In the eighth article, by Paul Nomikos, "Detection and diagnosis of abnormal batch operations based on multi-way principal component analysis," a statistical model based on online process measurements from past successful batches is used in a new monitoring scheme to determine if current batches are processing normally or abnormally.

The ninth article, by Jean Fischer Bandy and David Emerson, "Common resources in SP88 style applications," discusses design considerations and alternatives for dealing with common resources (e.g., raw material supply units and transfer lines) in batch control applications.

The tenth and final article, by Ralph Kappelhoff, "S88 impact on health and beauty care operations," describes a case study of a fast-track batch control project in a cosmetics company. Cost and time savings were realized in both the initial project and in subsequent projects at the same site through application of the S88.01 standard.

-Thomas G. Fisher, PE., editor in chief

Copyright Instrument Society of America Jan 1997
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