RNRG Class 1 Anemometer

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

Product Configurations

MEASNET Calibrated



Details

The NRG Class 1 Anemometer is a ball-bearing version of our industry-leading RNRG 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.


Specifications

  MEASNET Calibrated
Description
Sensor type 3-cup anemometer
Applications
  • 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)
Installation
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
Environmental
Operating temperature range -55 °C to 60 °C (-67 °F to 140 °F)
Operating humidity range 0 to 100% RH
Physical
Connections 4-40 brass hex nut/post terminals
Weight 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
Materials
Cups One piece injection-molded black polycarbonate
Body Housing is electrically conductive 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

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