EC: M-4839 Wide-Band Power Meter

Hardware — Data acquisition: M-4839 accurately measure energy, frequency and power factor with VFDs and other high harmonic environments, and meets DoE requirements as noted in 10 CFR 429 and 431 and others. This is a Control Engineering 2017 Engineers’ Choice Awards Finalist.


WPM-4839 Wide-Band Power Meter is an accurate, economical energy measurement system for variable frequency drive applications.

The Department of Energy (DoE) issued changes to the measurement requirements for determining pump energy for equipment driven by electric variable frequency drives (VFDs) (10 CFR 429 and 431), and also issued a NOPR EERE-2014-BT-TP-0054 making similar revisions to the standards for electrically driven air-compressors. DoE is expected to expand its requirements across multiple categories of equipment.

The new standard requires accurate measurement of the input power up to at least the 40th harmonic of 60 Hz. In response, OSI has developed the WPM, an economical measurement system that allows for remote reading with simple commands in an open protocol that is available to all users:

It features…

  • Accurate 0.25% of reading energy measurement up to the 40th harmonic of 60 Hz
  • Selected CT's for improved system accuracy
  • Simple RS-232, RS-422, RS-485 or USB interfaces (used with a simple ASCII communication protocol).

The WPM was tested with 40th harmonic energy equal to 10% of the total energy with no significant deterioration in measurement accuracy. This was achieved by impressing 40th harmonic equal to 10% of the total on both the current and voltage signals.

In all cases, the WPM system exceeded the DoE requirements by a wide safety margin.

New DoE requirements can be readily and economically met with proven technology using open communication protocols.

Ohio Semitronics Inc., 

No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Big Data and IIoT value; Monitoring Big Data; Robotics safety standards and programming; Learning about PID
Motor specification guidelines; Understanding multivariable control; Improving a safety instrumented system; 2017 Engineers' Choice Award Winners
Selecting the best controller from several viewpoints; System integrator advice for the IIoT; TSN and real-time Ethernet; Questions to ask when selecting a VFD; Action items for an aging PLC/DCS
This digital report will explore several aspects of how IIoT will transform manufacturing in the coming years.
Motion control advances and solutions can help with machine control, automated control on assembly lines, integration of robotics and automation, and machine safety.
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

Future of oil and gas projects; Reservoir models; The importance of SCADA to oil and gas
Big Data and bigger solutions; Tablet technologies; SCADA developments
SCADA at the junction, Managing risk through maintenance, Moving at the speed of data
Automation Engineer; Wood Group
System Integrator; Cross Integrated Systems Group
Jose S. Vasquez, Jr.
Fire & Life Safety Engineer; Technip USA Inc.
click me