Monthly Archive: October 2010

Oct
29

Advanced Temperature Measurement and Control Insight of the Day

The accuracy of a ratio two color optical pyrometer may be less than a single color pyrometer because of the variation of emittance and radiation intensity with wavelength (Non Graybody) Source

Oct
28

Enhanced PID for Wireless Eliminates Split Range Oscillations

The crisscrossing of the split range point is a common problem due to the severe discontinuity and stick-slip at the closed position where seating friction and changes in the process gain is the greatest. The crisscrossing from steam to coolant for temperature control, acid to base for pH control, and vent to supply for pressure …

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Oct
28

Advanced Temperature Measurement and Control Insight of the Day

Optical pyrometers are required when contact with the process is not possible or extreme process temperatures and conditions cause chemical attack, physical damage, or an excessive decalibration, dynamic, velocity, or radiation error of a TC or RTD. Source

Oct
28

Use of Data Analytics in Pharmaceutical Manufacturing

Earlier this year I had the pleasure of speaking at a conference on FDA and PAT for Pharma Manufacturing, FDA-Partnering with Industry. This 2-day conference was co-sponsored by the FDA and the University Of Rhode Island College Of Pharmacy. The primary object of this conference was to “Disseminate current and accurate information on Process Analytical …

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Oct
27

Advanced Temperature Measurement and Control Insight of the Day

Thermocouple extension wire, noise, and the consequences of drift in terms of a process offset from the true optimum value and the need for more frequent calibration make the life cycle costs of a thermocouple (TC) larger than a Resistance Temperature Detector (RTD). Source

Oct
26

Advanced Temperature Measurement and Control Insight of the Day

The thermowell and protection tube design and material, the process heat transfer coefficient, and the fit of the sensor determine the temperature measurement speed of response more than the sensor type. Source

Oct
25

Advanced Temperature Measurement and Control Insight of the Day

A Resistance Temperature Detector (RTD) has a much better sensitivity and repeatability, a lower and more predictable drift, and a higher signal level than a thermocouple (TC). Source

Oct
22

How to Get Started With Advanced Control

A new track called “Meet the Experts” was added this year to Emerson Exchange. The workshops for this track were schedule for the last day of the conference, Friday, Oct 8th. Even so, from what I observed these workshops were well attended and thus I hope this track will continue to be offered in the …

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Oct
15

ISA Automation Week 2010 – The Most Important Week in my Career

ISA automation week was a success in terms of technical content. The renewed emphasis on technical presentations particularly in automation and control rejuvenated my interest in the International Society of Automation. I moderated a panel discussion on loop tuning. Harold Wade setup the ISA simulator for the following cases that were designed by me to …

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Oct
14

Guidelines for Setting Filtering and Module Execution Rate

Many digital controllers used in the process industry today allow the end user to specify the control loop period of execution. However, books on process control often provide little or no information on how execution period impacts control performance. Also, no mention is made of the fact that the amount of filtering needed to avoid …

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