Setting the Standard for Automation

September 2020 Technical Meeting

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September 2020 Technical Meeting

September 22 @ 7:00 pm - 8:00 pm


Imperfect manual testing, bypassing, and systematic failures have historically been ignored in safety system modeling, yet the impact of all three is quite easy to model, and the negative performance impact is much greater than many people realize. The second edition of IEC 61511 about to be released now acknowledges dangerous failures not detected by automatic diagnostics or manual testing, and states this factor shall be included in calculations. One of many recurring causes of chemical plant accidents has been documented as “inadequate indications of process condition”, such as continuing operations when a safety instrument was in bypass. Design and maintenance problems have occurred that would have prevented systems from responding to actual demands. This presentation will summarize how these three factors can be modeled and their dramatic impact on system performance.

Paul Gruhn is a Global Functional Safety Consultant with aeSolutions in Houston, Texas. Paul is an ISA (International Society of Automation) Life Fellow, a 30 year member and co-chair of the ISA 84 standard committee (on safety instrumented systems), the developer and instructor of ISA courses on safety systems, the author of two ISA textbooks, and the developer of the first commercial safety system modeling software. Paul has a B.S. degree in Mechanical Engineering from Illinois Institute of Technology, is a licensed Professional Engineer (PE) in Texas, a member of the Control Systems Engineering PE exam committee, and both a Certified Functional Safety Expert (CFSE) and an ISA 84 Safety Instrumented Systems Expert. Paul was the 2019 ISA President.

Virtual Event!

We will be hosting this meeting Virtually!  Details to join the meeting will be distributed to registered attendees the day before the meeting.  You must register to get a link to the event.  Note the presentation will start at 7:00 pm.


September 22
7:00 pm - 8:00 pm
Event Categories:


Virtual Event
IL United States


ISA, Will-DuPage Section