Category Archive: Control Design & Commissioning

Dec
08

Using Wireless Throttling Valves in Column Control

At Emerson Exchange 2014 I worked with Stephen Briggs, University Of Texas, Austin and Kurtis Jensen, Emerson Process Management, to co-host a workshop on control using a wireless throttling valve. As addressed in this presentation, we have tested in a flow lab the control performance that may be achieved using PIDPlus with a wireless throttling …

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Jun
09

Wireless Control Presentation – ACC 2014

OLYMPUS DIGITAL CAMERA

This last week I gave a paper presentation at the American Control Conference, Portland, OR. The topic of this paper was PID Control Using Wireless Measurements. I co-authored the paper with Mark Nixon and Willy Wojsznis. Below is a picture taken during the presentation. This paper presents a wireless PID controller, known as PIDPlus. The …

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May
05

Control Loop Foundation Reprint

Manual Tuning Integrating Process

A book goes through many reviews and edits before it can be published. Still, it is very difficult for the authors and reviewers to catch all the typo’s in the original text and those that are introduced during the type setting process (formatting for publication). ISA recently notified me that the book that Mark Nixon …

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Apr
28

Providing 24VDC to Field Devices

OLYMPUS DIGITAL CAMERA

Some field devices such as an inductive proximity switch may be designed as three wire devices that require a 24VDC source of power. In such cases it is possible to tap into the 24 volt bulk power supply in the rack room and run twisted pair to the device. However, to protect against a short …

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Apr
21

IEC 61987 – List of Properties (LOP)

IEC List of Properties Standard 61987

During the TC65 Plenary meeting each working group gives an activity report that summarizes the status of standards that are being developed or updated. At the Hamburg meeting, March 31- April 4th I was a delegate to the SC65B and SC65C meeting and lead the US delegation in the SC65E meeting. The reports by Peer …

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Apr
14

IEC TC65 Standards Work

IEC Webstore

The international standards for industrial-process measurement, control and automation are developed through IEC TC65. As stated on the IEC web site, the standards developed by TC65 address systems and elements used for industrial-process measurement and control concerning continuous and batch processes. These standards address equipment and systems operating with electrical, pneumatic, hydraulic, mechanical or other …

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Apr
07

TC65 Plenary Meeting

SC65E Meeting Hamburg Germany

Many of the international standards that we depend on in the process industry were created by working groups within IEC TC65: Industrial-process measurement, control and automation. IEC TC65 holds a plenary meeting every two years to review the status of work to develop or update international standards. The most recent plenary meeting was held March …

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Mar
31

Wireless Throttling Valve Power Consumption

Control to Minimize Changes in Target Valve Position

Something that all manufactures of wireless throttling valves must be concerned with in their design is battery power consumption. In a control application using a wireless throttling valve much of the power available to the actuator is used to track changes in target valve position. To minimize battery power consumption, the number of changes made …

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Mar
24

Utilizing Wireless Throttling Valves in Control

PIDPlus Using Wireless Valve

Over the last five years a wide variety of WirelessHART transmitters have been introduced by the major manufacturers of field devices. The PIDPlus enables closed loop control using the slower update rate provided by a wireless transmitter. The broad acceptance of wireless transmitters has generated an interest in the application of wireless throttling valves in …

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Mar
17

Flow Control – Positive Displacement Pump Part 2

Positive Displacement Pump Flow Control With Throttling Valve

When using a positive displacement pump in flow control, then the minimum flow which may be achieved using a variable speed drive is limited by the motor low speed limit. It is possible to achieve a wider range of flow control by regulating flow using a fixed speed motor and a throttling valve in combination …

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