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  • NRG #40C Uncertainty and Classification

    NRG Systems receives many questions regarding anemometer accuracy, uncertainty and performance. The application note "#40 Anemometer Uncertainty" found in the Technical Support Documentation area of the website addresses uncertainty and measurement, anemometer classification number and calibration...
    Posted to Sensor Uncertainty (Forum) by johng on 09-23-2011

  • Powering IceFree3 Sensors

    I'm looking for power systems to supply power to IceFree3 sensors and am wondering what others have done in the past. The sites are not close to any grid power and therefore would require stand-alone power. Additionally the sites are located at northern latitudes and must be reliable for long periods...
    Posted to Standard Sensors (Forum) by windklug on 06-20-2011

  • Re: #40H applying transfer function

    Hi - Your method will give you the correct one minute average. However, one minute averages are not typically used in the windpower industry. I've added some more information below, in case it is helpful for you. For the resource assessment side of wind power, the industry has standardized on 2 second...
    Posted to Standard Sensors (Forum) by johng on 11-04-2009

  • Re: #40c on a Nomad2

    Hi - The "H" in #40H stands for "Hall Effect". The #40 and #40H anemometers are essentially the same except for the signal pickup transducer. The #40 uses a 600 ohm signal coil and the 40H uses a Hall Effect device. Both the coil and the Hall Effect device pick up the magnet's...
    Posted to Startup Q&A (Forum) by johng on 11-02-2009

  • Keeping IceFreeIII Heaters Connected

    NRG IceFreeIII sensors are designed to be run with the heater connected at all times. There are several reasons for this: 1) All calculations regarding the accuracy of the transfer function are performed with the heater on. 2) The heater, once the sensor gets to temperature, is variable, and only draws...
    Posted to Turbine Control (Forum) by Matt Riley on 07-22-2009

  • White Paper: "Investigation of the NRG #40 Anemometer Slowdown" by Steven H. Clark

    AWEA Windpower 2009 Paper V5-11-09.pdf Paper submitted for AWEA Windpower 2009 Conference, 4 - 7 May 2009, Chicago, IL, USA "Investigation of the NRG #40 Anemometer Slowdown" by Steven H. Clark, Principal Investigator Owen Clay, John A. Goglia, Timothy R. Hoopes, Lawrence T. Jacobs, R. Paul...
    Posted to Update on #40 Vibratory Mode (Forum) by Julia Austin on 05-14-2009

  • AWEA Windpower 2009 Presentation "Investigation of the NRG #40 Anemometer Slowdown"

    AWEA Windpower 2009 Presentation V5-12-09.pdf "Investigation of the NRG #40 Anemometer Slowdown" Presented 7 May 2009 by Steven Clark, Mechanical Engineer, NRG Systems, Inc. AWEA WINDPOWER Conference and Exhibition 2009, Chicago, IL
    Posted to Update on #40 Vibratory Mode (Forum) by Julia Austin on 05-14-2009

  • Progress Update on TSB008

    On May 22, 2008 NRG Systems issued Technical Support Bulletin TSB-008 regarding the NRG #40C anemometer. Specifically, TSB-008 provided details on a manufacturing defect detected in the epoxy potting process of the sensor magnet that could cause a sensor to underreport wind speeds. It outlined corrective...
    Posted to Update on #40 Vibratory Mode (Forum) by Julia Austin on 11-19-2008

  • NRG item 4214 -- new 95" sensor mounting boom

    Hello, What are good applications for the new 95" boom? I was thinking about using it on a standard 60-m tower instead of the 60" boom. Looking at a tower shadow sketch, I see that getting a sensor only four tower diameters away from the tower would give a reading of at worst +/- 2% of free...
    Posted to Update on #40 Vibratory Mode (Forum) by Anonymous on 06-26-2008

  • How can affected sensors be identified?

    Over time, a sensor which expresses this defect will spin more slowly than an unaffected sensor and discrepancies in the performance between the two may be noticed. When looking for discrepencies, it is a good idea to include filtering for icing, tower shadow effects and speed range. For example, one...
    Posted to Update on #40 Vibratory Mode (Forum) by johng on 06-11-2008
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