East West Infiniti Pvt Ltd.

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NRG Systems Class 1 Anemometer


The NRG Systems Class 1 anemometer is a ball-bearing version of the industry-leading NRG #40C anemometer and was designed in direct response to customer requests for Class 1A compliance to IEC-61400-12-1. Exceptional field testing results reinforce confidence in both reliability and repeatability of the data. 

For wind resource assessment projects requiring an anemometer with Class 1A compliance, the NRG Systems Class 1 Anemometer is the ideal, low-cost solution. 

Revolutionary, patent-pending, dual shaft design protects the bearings from debris and common impact loads experienced in harsh climates, which further extends

the life of the anemometer.

NRG Systems is the first company to obtain endorsement in the classification of an anemometer from Troels Pedersen of the DTU Wind Energy Department.


A calibration certificate verifying that the sensor is traceable to the National Institute of Standards and Technology (USA) is available through electronic download.




Sensor type 3-cup anemometer
  • wind resource assessment
  • meteorological studies
  • environmental monitoring
  • Sensor range 1 m/s to 96 m/s (2.2 mph to 215 mph) (highest tested)
    Instrument compatibility all NRG Systems data loggers
    Output signal
    Signal type low level AC sine wave, frequency linearly proportional to wind speed
    Anemometer Transfer Function
  • Refer to individual calibration report for anemometer transfer function.
  • All NRG Class 1 anemometers are calibrated per IEC 61400-12-1, Annex F.
  • Output voltage at threshold 80 mV (peak-to-peak) minimum
    Output voltage at 60Hz
  • 12 V (peak-to-peak) typical
  • output amplitude NOT proportional to wind speed
  • Calibration each anemometer individually calibrated, calibration reports provided via electronic download
    Output signal range 0 Hz to 125 Hz (highest recorded)
    Uncertainty IEC 61400-12-1 Classification
  • Class 1.01A
  • Class 8.44B
    IEC 61400-12-1 operational standard uncertainty:
  • ± 0.06 m/s at 10 m/s for class A
  • ± 0.49 m/s at 10 m/s for class B
  • Refer to individual calibration sheet for information on calibration uncertainty.
  • Response characteristics
    Threshold 0.79 m/s (1.77 mph) per ASTM D 5096-02
    Distance constant (63% recovery)
  • 2.36 m (7.74 ft) at 5 m/s per ASTM D 5096-02
  • 2.28 m (7.48 ft) at 10 m/s per ASTM D 5096-02
  • Moment of inertia
  • 1.01 x 10-4 kg-m2
  • 74.5 x 10-6 S-ft2
  • Swept diameter of rotor 190 mm (7.5 inches)
    Mounting onto a 13 mm (0.5 inch) diameter mast with cotter pin and set screw
    Tools required 0.25 inch nut driver, petroleum jelly, electrical tape
    Operating temperature range -55 °C to 60 °C (-67 °F to 140 °F)
    Operating humidity range 0 to 100% RH
    Connections 4-40 brass hex nut/post terminals
    Weight 0.14 kg (0.3 lbs)
  • 3 cups of conical cross-section, 51 mm (2 inches) dia.
  • 81 mm (3.2 inches) overall assembly height
  • Materials
    Cups one piece injection-molded black polycarbonate
    Body housing is black ABS plastic
    Shaft hardened 400 series stainless steel
    Bearing ball bearings
    Magnet Indox 1, 25 mm (1 inch) diameter, 13 mm (0.5 inch) long, 4 poles
    Coil single coil, bobbin wound, 4100 turns of #40 wire, shielded for ESD protection
    Boot protective PVC sensor terminal boot included
    Terminals brass



    Product Documentation

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    • Application Notes or Reference Guide: Need more information about a specific product? Details about specific situations or settings can be found in the application notes.
    • Software Downloads: Just need to quickly check for a software update? This is the right place.
    • Check out the Knowledge Base: Find answers and solutions to common questions here. This is a constantly evolving database, so check it often for the latest and greatest information.


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    If you have checked the documentation, forums, and Knowledge Base and are still having problems with your equipment purchased within the past two years, you will need to contact NRG for a RMA return authorization number to return a defective product. This is the quickest and easiest way to get you back to doing what you are trying to do, measure the wind. Please see NRG Warranty for warranty details and instructions.

    Repair Service

    If you should need to return an out-of-warranty item for repair, please contact NRG in order to obtain an RMA number. Detailed instructions for returning an item to NRG can be found in the document Returning_Repairs_to_NRG.pdf.

    Contact Technical Support

    If you’ve explored all of the above resources and still have questions, we have a crack team of professionals waiting to answer your call or email. We ask that you be sure to use the tools above before contacting us, and we will do our best to assist you.