Terry Blevins

Author's details

Date registered: April 19, 2011

Biography

Terry Blevins has been actively involved in the application and design of process control systems throughout his career. For more than 15 years, he worked as a systems engineer and group manager in the design and startup of advanced control solutions for the pulp and paper industry. Terry was instrumental in the establishment of Emerson Process Management's Advanced Control Program. From 1998-2005, Terry was the team lead for the development of DeltaV advanced control products. He is the Fieldbus Foundation™ team lead for the development and maintenance of the Function Block Specification and editor of the SIS Architecture and Model Specifications. In this capacity, Terry is involved in the movement of Fieldbus Foundation function block work into international standards. Terry is the U.S. expert to the IEC SC65E WG7 function block committee that is responsible for the IEC 61804 function block standards. He is a voting member and chairman of ISA104-EDDL (Electronic Device Description Language) committee and is the technical advisor to the United States Technical Advisory Group (USTAG) for the IEC65E subcommittee. He is also a member of the USNC TAG (IEC/SC65 and IEC/TC65). Terry authored "An Overview of the ISA/IEC Fieldbus," Section 11, Standards Overview, Fifth Edition of the Process/Industrial Instruments and Controls Handbook and coauthored four sections in the Fourth Edition of the Instrumentation Engineer's Handbook, Process Control and Optimization. He coauthored the ISA bestselling book Advanced Control Unleashed. He has 36 patents and has written over 65 papers on process control system design and applications. Terry received a Bachelor of Science in Electrical Engineering from the University of Louisville in 1971 and a Master of Science in Electrical Engineering from Purdue University in 1973. In 2004, he was inducted into Control Magazine's Process Automation Hall of Fame. Presently, Terry is a principal technologist in the future architecture team of DeltaV Product Engineering at Emerson Process Management.

Latest posts

  1. Control Using Wireless Devices – Part 1 — February 20, 2012
  2. Monitoring Turbine and Compressor Operation — February 13, 2012
  3. Teaching the 9025 Class – Costa Rica — February 6, 2012
  4. Centrifugal Compressor Efficiency – Part 4 — January 30, 2012
  5. Centrifugal Compressor Efficiency – Part 3 — January 23, 2012

Most commented posts

  1. Control Basics and Terminology — 1 comment
  2. Basics of Advanced Control — 1 comment

Author's posts listings

Feb
20

Control Using Wireless Devices – Part 1

PIDPlus

Work on the WirelessHART specification began over seven years ago. Since that time the WirelessHART specification has been published by the HART Communications Foundation. Also, in 2010 WirelessHART was approved by IEC as an international standard,  IEC 62591Ed. 1.0. From the very beginning, the WirelessHART design included the features required for both monitoring and control applications. …

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Feb
13

Monitoring Turbine and Compressor Operation

Web Access

In January I posted a series of four (4) blogs that addressed the implement of an on-line compressor efficiency calculation. The example for this series was a compressor for a refrigeration system that used R134a refrigerant. If you have a similar compressor application in your plant then the information provided in these blogs may act …

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Feb
06

Teaching the 9025 Class – Costa Rica

9025 Class - Costa Rica

The week of January 8th, 2012 I traveled to our office in Costa Rica to teach the 9025 class. This class was created last year by Emerson’s education department to provide training on the basics of process control and instrumentation. The lecture material and student workshops included in the class are based on the book …

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Jan
30

Centrifugal Compressor Efficiency – Part 4

CompleteEff

Part 1 of the centrifugal compressor efficiency series addressed the measurements and parameters that must be calculated to determine compressor efficiency. In Part 2-3 of this series we examined one way of calculating the enthalpy and entropy of the gas stream at the compressor suction and discharge and isentropic enthalpy for the refrigerant R134a. Once …

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Jan
23

Centrifugal Compressor Efficiency – Part 3

Entropy R134a

Part 1 of the centrifugal compressor efficiency series addressed the measurements and parameters that are used to calculate compressor efficiency. In Part 2 of this series we examine how these measurements are used to calculate the enthalpy of the gas stream at the compressor suction and discharged for the refrigerant R134a. This calculation utilized bilinear …

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Jan
16

Centrifugal Compressor Efficiency – Part 2

R134a Thermodynamic Properties

As addressed in Part 1 of the centrifugal compressor efficiency series, the enthalpy of the gas stream at the compressor suction and discharge must be known to determine the compressor efficiency. Also, the isentropic enthalpy must be determined based on the gas stream entropy at the compressor suction and the compressor discharge pressure. These properties …

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Jan
09

Centrifugal Compressor Efficiency – Part 1

Measurements On-line Compressor Efficiency

Centrifugal compressors play an important role within the process industry. In some cases compressor capacity may determine the throughput of a plant. If a compressor is used for refrigeration then any variation in compressor operation may directly impact the temperature control in key unit operations such as flash vessels and exothermic reactors. Also, the compressor …

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Jan
02

Field Device Integration (FDI)

20111215_375

In June, 2100 the International Electrotechnical Commission (IEC)  distributed a new project proposal 65E/199/NP, Devices and integration in enterprise systems; Field Device Integration (FDI) – Part 1 to 7. Voting on this proposal was completed in October, 2011 and the new project was approved. Within IEC the SC65E WG7 committee will address converting the draft FDI …

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Dec
26

Technical Exhibit at Emerson Exchange – Advanced Control

Emerson Exchange Exhibit Area for Advanced Control - Part 1

The number of registered participants at Emerson Exchange, 2011 exceeded 2,900 people. In technical sessions, over 300 papers were presented on a wide variety of topics. At Emerson Exchange the DeltaV future architecture team often presents papers on field trail results associated with prototypes of new technology and applications that we have developed. For example, …

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Dec
19

Maximizing the Return on Your Control Investment – Part 2

As addressed in my December 12th blog posting, James Beall and I presented Part 1 of this presentation on Friday morning at Emerson Exchange, 2011 in a “meet the expert” workshop. Part 2 was not presentation at Emerson Exchange because of time limitation. In this continuation of the presentation we address when it is possible …

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