Articles

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  • Digital data recorders deliver

    This month's Technically Speaking column compares mechanical, analog and digital recorders for data acquisition and concludes that local data logging can be the easiest way to satisfy regulatory requirements.

    03/29/2005
  • Diffusing Bubble Bombs

    Proper Valve Sizing for Severe Service Can Help Lessen Wear and Damage from Cavitation

    11/18/2009
  • Difficult Level Measurements

    “Ask the Experts” is moderated by noted process control authority Béla Lipták (liptakbela@aol.com), editor of the Instrument Engineer’s Handbook. In this column, he and his co-authors welcome questions concerning process measurement or control. Please include P&ID drawings using ISA symbols to illustrate questions where necessary.

    10/02/2007
  • Diagramming drum level control

    Harold Wade suggest a few additional points be made to the three-element boiler level control figures in a previous article that show how signals from the steam flow FT and the drum LT combine in the LIC.

    10/16/2006
  • Diagnostic Motor Problems

    Keep Your Motors Humming. Diagnostics Can tell You When a Motor Is Having Problems, but You May Still Need to Keep Your Meters and Meggers Available

    05/13/2009
  • Diagnosing Final Control Elements

    McMillan and Weiner Ask James Beall What Was the Biggest Step Forward that Helped Him Improve Valve Performance

    Greg McMillan, Stan Weiner
    12/07/2012
  • Deterministic networking on Ethernet

    Andreas Pfeiffer writes that if Ethernet has any hope of becoming an automation control standard, time-deterministic control must coexist within a single message format with non-real-time data.

    01/22/2005
  • Detection of oil in or on water

    The properties of oil and water are sufficiently different to make distinguishing them relatively easy. Here we explore some of the state-of-the-art sensors used for oil in and on water detection, including interfaces.

    Béla Lipták
    07/22/2016
  • Detecting Bunker C Oil Mass Flow

    “Ask the Experts,” on ControlGlobal.com, is moderated by noted process control authority Béla Lipták. Béla and his cadre of leading experts in process automation, recruited from among the co-authors of the Instrument Engineer’s Handbook 4th Edition, are “in the box” all month answering process control questions from all comers. The best will be published here. In order to eliminate misunderstandings, please include P&ID sketches using ISA symbols with your questions.

    08/01/2007
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