PFDavg for 1oo2 voting devices with common cause

Viewpoint on ISA TR84.0.02 Simplified Methods and Fault Tree Analysis

Abstract: ANSI/ISA-S84.01-1996 and IEC 61508 require the establishment of a safety integrity level for any safety instrumented system or safety related system used to mitigate risk. Each stage of design, operation, maintenance, and testing is judged against this safety integrity level. Quantitative techniques can be used to verify whether the safety integrity level is met. […]

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Honors and Awards

ISA Honors Outstanding Achievements

ISA is proud to recognize individuals who have made outstanding contributions to the Society and to the automation community. The distinguished grade of Fellow is conveyed by ISA to qualified senior members who have made exceptional engineering or scientific contributions to the field of automation. In addition, deserving and qualified individuals, both members and non-members, […]

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Networking

The Power of Networking: Jobs, Business, Even Fun

I receive a plethora of newsletters, mostly dealing with our technology or with applications. However I also receive a few on marketing, Telisian’s  “What’s Working in Marketing & eBusiness” , and on using social media like LinkedIn, Facebook and Twitter. Indeed, as many of you know, I am an inveterate tweeter! I recently received a […]

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Linear Relationships for 4-20 mA transmitters

Linear Relationships for 4-20 Transmitters A standard electronic pressure transmitter has a range of 50 to 250 psig (345 to 1724 kPa gage), and the pressure is 150 psig (1034 kPa gage), what is the output in mA? a.   4.0 mA b.   12.0 mA c.   13.6 mA d.   50.0 mA   The formula I use […]

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Virtualization allows one computer to take the place of multiple computers, resulting in greater efficiency.

Virtualization Simplifies Computer Maintenance and Delivers High Performance

The process of virtualization works by inserting a thin layer of software called the hypervisor directly into the computer hardware. The hypervisor layer presents multiple sets of “virtual hardware,” which contain the same components as a regular machine (e.g., motherboard, chipset, etc.). To an operating system, virtual hardware is indistinguishable from a regular machine. … […]

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Establishing a Successful Water/Wastewater Commissioning Program

“I recommend the paper “Establishing a Successful Commissioning Program” by Richard Birdsell and Mike Puccio of the Orange County Sanitation District (Orange County, California, USA). This was one of the papers presented at the 2011 ISA Water/Wastewater and Automatic Controls Symposium in St. Louis, Missouri (June 22-23, 2011).” — Graham Nasby – General Symposium chair […]

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Square root formula

Evaluation Question

An analog electronic d/p transmitter has an output of 4-20 mA which represents 0 to 100 gpm (0 to 378.5 lpm). On a properly calibrated transmitter, what is the output in gpm (lpm), if the transmitter output is 12 mA?          a.    25                 (94 lpm)          b.   33.3             (126 lpm)          c.   70.7             (267.6 […]

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Instrumentation book

Instrumentation and Control Systems Documentation: Two generations of knowledge

When you read a book, do you ever consider the years of knowledge that lie behind the words? Collectively, the co-authors of Instrumentation and Control Systems Documentation, Second Edition bring 80-plus years’ worth of experience to each page. What’s even more unique is they are father and son. A dedicated ISA member for more than […]

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ISA Announces Energy Track at ISA Automation Week 2011

ISA announced today the sessions of its Energy Track at ISA Automation Week 2011: Technology and Solutions Event. The conference will take place in Mobile, Alabama, USA, 17-20 October 2011, at the Arthur R. Outlaw Convention Center. The Energy Track offers a spectrum of presentations on recent advances in automation for buildings, industrial plants and […]

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