Upon close examination it appears that the product approval process of IEC 61508(1) has veered seriously off course, possibly rendering many safety instrumented system (SIS) applications less reliable than expected or required. Published on ControlGlobal, June 2008.

Published in Control Global, February 2007.Published in Control Global, February 2007.Published in Control Global, February 2007.

Presented at the10th Annual Universal Delayed Coking Seminar, Long Beach, CA, August 1-3, 2005. Presented at the IV Congresso Rio Automacao, Centro de Convencoes – FIRJAN, Rio de Janeiro, Brazil, May 2007.

Published in Instrument Engineers Handbook, Volume 4, Chapter 6.9, 2006.

Published in Flow Control, November, 2006.

Presented at Loss Prevention Symposium, American Institute of Chemical Engineers, April 2001. Published in Process Safety Progress, June 2002.

Published in Control Engineering, November 2000. Presented at ISA EXPO, September 2001.