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OPAF expands membership, releases O-PAS Version 1.0

The Open Process Automation Forum defines the future with its Open Process Automation Standard

CT1903 cover story lead art2

Every dream house needs a solid foundation. In the case of the Open Process Automation Forum's (OPAF) quest for interoperable, plug-and-play networking and process controls, this means defining common requirements, securing participating members, gaining consensus, and testing to achieve compliance with its Open-Process Automation Standard (O-PAS).    Beyond expanding to 133 members during the past year, including end users, system integrators, suppliers and supporting organizations, OPAF and the Open Group also took the major step of publishing their preliminary O-PAS, Version 1.0, on Feb. 5 at ARC Advisory Group's Industry Forum in Orlando. This five-part document…

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Resources

CG1903 LevelSOT Tablet compressorLevel Measurement, Spring 2019

The latest trends, technology and implementations on the topic of level measurement are detailed in this new eBook from the editors of Control. Learn when reducing variability can be wrong, how to understand P, I and D, and why global warming is like level control. Download it here.

 

CG1903 DE tablet compressorOur latest issue: March 2019

Beyond expanding to 133 members during the past year, OPAF and the Open Group also took the major step of publishing their preliminary O-PAS, Version 1.0. Also in this issue are feature articles about modern historians and how to specify a control valve. Read the issue.

 

Voices: Ask The Experts

Differential pressure level in a purged tank

Hydrostatic and head pressures can lead to confusion

Q: When using a differential-pressure (DP) level transmitter, are the high and the low pressure ports reversed if the tank is purged with nitrogen? Purging is needed because the tank contains a hydrate inhibitor.R. Revishr.revish@gmail.comA: In all wet leg-type level installations, the top…

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