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NRG Class 1 Anemometer

The NRG Class 1 anemometer is the ideal, low-cost solution for wind resource assessment projects that require an anemometer with class 1A compliance.

  • NRG Class 1 Anemometer
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NRG Class 1 Anemometer | MEASNET Calibrated

#5966

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NRG Class 1 Anemometer | CPH MEASNET Calibrated

#5967

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The NRG Class 1 Anemometer is a ball-bearing version of our industry-leading NRG 40C Anemometer. That is, it relies upon the same compact external form factor for easy transport and installation. Inside, the patented dual shaft design of the NRG Class 1 protects the bearings from debris and the common impact loads experienced in harsh climates, while the bearings themselves deliver the low friction necessary to achieve certified class 1 performance.

NRG was the first company to obtain endorsement in the classification of an anemometer from Troels Pedersen of the DTU Wind Energy Department. A calibration certificate comes with each sensor, verifying its traceability to the National Institute of Standards and Technology (U.S.A.): Download Calibration Report.

  NRG Class 1 Anemometer | MEASNET Calibrated (#5966) NRG Class 1 Anemometer | CPH MEASNET Calibrated (#5967)
Description  
Sensor type 3-cup anemometer 3-cup anemometer
Applications
  • Wind resource assessment
  • Meteorological studies
  • Environmental monitoring
  • Wind resource assessment
  • Meteorological studies
  • Environmental monitoring
Sensor range 1 m/s to 96 m/s (2.2 mph to 215 mph) (highest tested) 1 m/s to 96 m/s (2.2 mph to 215 mph) (highest tested)
Instrument compatibility All NRG Systems data loggers All NRG Systems data loggers
Output signal  
Signal type Low level AC sine wave, frequency linearly proportional to wind speed 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.
  • 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 80 mV (peak-to-peak) minimum
Output voltage at 60Hz
  • 12 V (peak-to-peak) typical
  • output amplitude NOT proportional to wind speed
  • 12 V (peak-to-peak) typical
  • output amplitude NOT proportional to wind speed
Calibration Each anemometer individually calibrated, calibration reports provided via electronic download Each anemometer individually calibrated, calibration reports provided via electronic download
Output signal range 0 Hz to 125 Hz (highest recorded) 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.
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 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
  • 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
  • 1.01 x 10-4 kg-m2
  • 74.5 x 10-6 S-ft2
Swept diameter of rotor 190 mm (7.5 inches) 190 mm (7.5 inches)
Installation  
Mounting Onto a 13 mm (0.5 inch) diameter mast with cotter pin and set screw 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 0.25 inch nut driver, petroleum jelly, electrical tape
Environmental  
Operating temperature range -55 °C to 60 °C (-67 °F to 140 °F) -55 °C to 60 °C (-67 °F to 140 °F)
Operating humidity range 0 to 100% RH 0 to 100% RH
Physical  
Connections 4-40 brass hex nut/post terminals 4-40 brass hex nut/post terminals
Weight 0.14 kg (0.3 lbs) 0.14 kg (0.3 lbs)
Dimensions
  • 3 cups of conical cross-section, 51 mm (2 inches) dia.
  • 81 mm (3.2 inches) overall assembly height
  • 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 One piece injection-molded black polycarbonate
Body Housing is electrically conductive black ABS plastic Housing is electrically conductive black ABS plastic
Shaft Hardened 400 series stainless steel Hardened 400 series stainless steel
Bearing Ball bearings Ball bearings
Magnet Indox 1, 25 mm (1 inch) diameter, 13 mm (0.5 inch) long, 4 poles 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 Single coil, bobbin wound, 4100 turns of #40 wire, shielded for ESD protection
Boot Protective PVC sensor terminal boot included Protective PVC sensor terminal boot included
Terminals Brass Brass
Boom Extensions

Boom Extensions

Extend and retrofit NRG booms to meet your project’s needs with our boom extensions and adapter kits.

Symphonie® SCM Card

Symphonie® SCM Card

Condition your sensor’s output signal so that a SymphoniePLUS3 Data Logger can read it by installing a Symphonie Signal Conditioning Module (SCM).

Sensor Calibration Service

Sensor Calibration Service

Use these services to recalibrate anemometers available from NRG.

Sensor Cable Kit - 2C

Sensor Cable Kit - 2C

Use this two-conductor (2C) cable for unheated anemometers.