Monthly Archive: November 2010

Nov
18

Heat Exchanger Temperature Control Insight of the Day

An adaptive controller, such as DeltaV Insight, where tuning settings are identified and scheduled as a function of manipulated flow can compensate for the changes in process gain and dead time. Source

Nov
18

Deminar Demos – Process Control Lab Website

The process control lab website is finally ready for public use. An ad hoc extracurricular effort by Emerson, Experitec, Monsanto, and Mynah created a fast, free, and easy interface to the process control labs used in the Deminar demos. I personally want to thank Charlie Schliesser (Experitec) and Jack Ahlers (Monsanto) who found a negligible …

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Nov
16

Heat Exchanger Temperature Control Insight of the Day

A high coolant flow much can cause a low process gain (poor sensitivity) that can lead to wandering of the temperature and possible loss of temperature control. Many of these nonlinearities for heat exchanger control can also occur for vessel coil and jacket temperature control. Source

Nov
15

Heat Exchanger Temperature Control Insight of the Day

A low coolant flow can cause a high process gain, a large process deadtime, and a large heat transfer lag that can lead to temperature oscillations and possible instability. Source

Nov
15

Control Loop Foundation Web Site

This week we completed work on the web site for the book Control Loop Foundation. Anyone can access this web site to view and perform the exercises for workshops and applications define in the book – a total of 19 exercises. Since the web site is constructed using HTML5, it may be accessed using a …

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Nov
11

Control Loop Foundation Overview

In a previous blog posting I provided some information about the book Control Loop Foundation co-authored by me and Mark Nixon This ISA publication became available for sale a week before Emerson Exchange 2010. To help promote the book, Mark and I put together an overview of Control Loop Foundation that we presented as a …

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Nov
09

Feedforward Control – Deminar 11 Dec 1

Deminar 11 “How to Setup and Adjust the Dynamic Compensation of Feedforward Signals” has been rescheduled from Wed Nov 17 to Wed Dec 1 (10 am CST not CDT). We will explore the adjustment of feedforward delay, lead-lag, and gain for the traditional PID and the smart PID for wireless (PIDPlus).

Nov
08

Can Measurement Delay be Helpful?

A delay of any sorts in a control loop is thought to be detrimental. This is true for an unmeasured load upset because the integrated error for a controller tuned for maximum disturbance rejection is proportional to the deadtime squared (see slide 12 of my ISA Automation Week 2010 Presentation) How-to-Get-the-Most-Out-of-Your-PID-Slides.pdf. I can’t think of …

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Nov
05

Advanced Temperature Measurement and Control Insight of the Day

Except for thermowell material thermal conductivity, the design and installation considerations that minimize dynamic error also minimize conduction error. Source

Nov
04

Batch Process Analytics – update –

Over the last three years the DeltaV future architecture team has worked closely with Lubrizol to develop and install a beta version of Emerson’s on-line batch analytics. At Emerson Exchange 2010 the Lubrizol Corp. represented by Robert Wojewodka, Technology Manager, Process Improvement Team Leader, accepted the 2010 PlantWeb Excellence Award for exceptional application of PlantWeb …

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