This Month’s Cover Story


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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Most Recent

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    Greg: We often forget that the performance of equipment is in the care of the automation system that is the window into the process and the means of affecting the process. It starts with the measurement. You can only do as well as what the measurement tells you. Despite the process being in the…

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  • Gateway bridges EtherNet/IP and Modbus

    One of the most persistent obstacles in industrial networking has been the chasm between two of the most widespread protocols, Modbus and EtherNet/IP. Their longtime inability to talk to each other caused huge inefficiencies, which forced users to jury rig hardware and program software to translate…

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  • What's holding back mobile HMI?

    By Ian Verhappen

    Mobile HMIs have been discussed everywhere for many years now, including hard hat-mounted proprietary systems more than a decade ago. However, despite all the marketing about HMI “anywhere, anytime,” we still don’t seem to have much penetration beyond the more traditional wired panel. The…

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  • Self-diagnostics may continue to rely on crowd-sourced intelligence

    By Paul Studebaker

    Our first car with a “check engine” light and a way to interpret it is a 1986 Honda Accord LXi. The top-line LXi came with fuel injection and a system to let the driver know something was amiss (the check engine light) and give the mechanic a hint what it might be. Find the indicator lamp on…

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  • How to get grants to fund workforce projects

    Christine LaFave Grace interviews Micki Vandeloo, president of Lakeview Consulting, to discuss how manufacturers can obtain grants to support their major projects and initiatives.TranscriptAmanda Del Buono: Hello, thanks for tuning in to this episode of Manufacturing Tomorrow's Workforce, I'm your…

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  • Can we control robots?

    By Béla Lipták

    Robots are the outgrowth of process control, and therefore, all control knowledge accumulated in automating regular industries also applies to robots. The only difference is their controller is an artificial intelligence (AI) "brain” that simultaneously receives a large number of measurements…

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