On a discrete input system, H & L can also be used as control points while HH and LL can be shutdown or alarm points. On an analog & discrete system then H & L can define your process limits that can't be exceeded for control purposes leading to many different decisions based ...

Thank you very much on all the comments and suggestions from all of you!!! It's been of Great help to me!!! Thank you all, and Thank you ISA!!! ------------------------------ Samuel Ko Works Supervisor I (Instrumentation) Water Supplies Department, HKSARG Kowloon City ---- ...

Christiam - not addressing your question but, I am passionate about C&Es. We've created an expert system that automatically generates C&Es and positions them to be query able for the end user post-project delivery. One can create a unit operation template, which includes SIFs ...

When I first put my hands on IEC-62881-2018, I expected to find many answers there, to questions frequently asked, but it came out it is 15 pages standard (including bibliography) and I didn't find the answers, that I needed. It has some useful information though. ------------------------------ ...

IMHO, HH, LL still need to be referred as 'Alarm' the same way 'H' and 'L' are referred, although it may differ in certain cases. These are Alarm limits when violated by the Process Variable (PV) have specific consequence, the consequence could be deviation from the process envelop, ...