NRG Systems

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.

  MEASNET Calibrated (#5966) 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

NRG Systems • 110 Riggs Road • Hinesburg, Vermont 05461 • +1 802-482-2255 • info@nrgsystems.com