Last month, Siemens Energy and Automation released a new safety I/O card that claims to be the first Hart, Analog input, SIL 3 http://www2.sea.siemens.com/News/Industrial/First-SIL-3-Certified-Hart-Analog-Input-Module.htm While some may find this as a break thru, it’s what I view as a direction of the industry.  Siemens and other ...

So you’re faced with the question of whether that trusty old transmitter you’ve been using as part of your safety shutdown system can meet the “prior use” requirements described in Section 11.5.3 of ANSI/ISA-84.00.01-2004 (IEC 61511-1 Mod).  Prior use, or Proven-in-use, is defined as a documented assessment showing ...