I discussed the use of RTDs and thermocouples for temperature measurement last week in a post, Temperature Measurement and Installation Practices. Emerson's Len Laskowski, a certified functional safety expert (CFSE), was recently asked about the use of thermocouples...
safety integrity level
Credit for Partial Stroke Tests in Verification Process
A question was posed this week to Emerson's Mike Boudreaux about how to take credit for partial stoke tests in a performance verification process. Mike leads the process safety systems efforts and was presenting on this topic this week. He wrote up this post to recap...
Considering the Whole Loop in Process Safety
In our continuing look at elements in the IEC 61511 process safety lifecycle, I uncovered an excellent presentation, Safety Instrumented Systems - Considering the Whole Loop, by Emerson's Andy Crosland. You may recall Andy from a recent process safety seminar series...
Safety Validation in the IEC 61511 Process Safety Lifecycle
A few weeks ago, I posted Safety Instrumented Function-Focused Approach. It summarized a presentation by Emerson's Russell Cockman and Andy Crosland on the role of an SIS integrator in the implementation phase of an IEC 61511 process safety project. Russell and Andy...
Control Systems for SIL 1 Safety Applications?
I received a great question today about the safety integrity level (SIL) of a distributed control system (DCS). In this case, the question was specific to the DeltaV system: Can you please advise if the Emerson DeltaV DCS has a SIL rating i.e. '0' or '1'? I understand...
Using HART Diagnostics in Your Safety Instrumented Systems
Emerson's Alan Harris has written a new whitepaper, DeltaV SIS HART Capabilities. It describes various HART capabilities that can be used with the DeltaV SIS system as well as HART diagnostics implementation best practices. For those unfamiliar with HART, the HART...
Comparing and Contrasting Process Safety and Cyber Security
Automation World has a great article, Security and Safety Follow Parallel Paths, which compares and contrasts process safety and cyber security, from a risk management perspective. In an earlier post, I described the ISA99 Working Group 7 (WG7) efforts to look at the...
Primer on Safety Instrumented Systems and Process Safety
The Flow Control magazine website has a great Safety Instrumented Systems Primer interview with Emerson's Mike Boudreaux. You may recall Mike and his views on process safety and safety instrumented systems in earlier posts. If you're not already steeped in the...
Positioners and Partial Stroke Tests in Safety Applications
InTech magazine has a web exclusive on the importance of safety valves in a safety instrumented system. The article, Valve failure: Not an Option, describes methods of implementing partial stroke testing (PST) to reduce the probability of failure upon demand, average...
Considering the Tradeoffs in Safety-Certified Sensors
Emerson's Dale Perry alerted me to a great article on safety-certified sensors in the November 2008 issue of Control Engineering magazine. Dale manages the Rosemount pressure measurement line of products. The article, Practice Safe Sensing; Safety-certified sensors...
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