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
Monthly Archive: October 2010
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 …
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 …
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 …
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 …
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 …
