NRG Systems

NRG 40C Anemometer - Solar

The 40C Anemometer offers field-proven measurement accuracy at an economical price.

  MEASNET CALIBRATED (#14845) NRG 40 ANEMOMETER (#14881)
Description  
Sensor type n/a 3 Cup Anemometer
Applications n/a
  • Solar resource assessment
  • Meteorological studies
  • Environmental monitoring
Sensor range n/a 1 m/s to 96 m/s (2.2 mph to 215 mph) (highest recorded)
Instrument compatibility n/a All NRG loggers
Output signal  
Signal type n/a Low level AC sine wave, frequency linearly proportional to wind speed
Anemometer Transfer Function n/a Consensus Transfer Function:
  • Scale Factor (Slope): 0.765 m/s/Hz (1.711 mph/Hz)
  • Offset: 0.35 m/s (0.78 mph)
    Note: Refer to the white paper "The Maximum Type 40 Anemometer Calibration Project" for more information on the consensus transfer function
Output voltage at threshold n/a 80 mV (peak-to-peak) minimum
Output voltage at 60Hz n/a
  • 12 V (peak-to-peak) typical
  • Output amplitude NOT proportional to wind speed
Output signal range n/a 0 Hz to 125 Hz (at 96m/s, highest recorded)
Uncertainty n/a Accuwind (Riso-R-1556) Classification:
  • Class 2.4A
  • Class 7.7B
    IEC 61400-12-1 operational standard uncertainty:
  • ± 0.14 m/s at 10 m/s for Class A
  • ± 0.45 m/s at 10 m/s for Class B
  • Refer to application note "#40C Anemometer Uncertainty" for definitions and more information
Response characteristics  
Distance constant (63% recovery) n/a
  • 2.55 m (8.37 feet) at 5m/s per ASTM D 5096-02
  • 2.56 m (8.40 feet) at 10m/s per ASTM D 5096-02
Moment of inertia n/a
  • 1.01 x 10-4 kg-m2
  • 74.5 x 10-6 S-ft2
Swept diameter of rotor n/a 190 mm (7.5 inches)
Installation  
Mounting n/a Onto a 13 mm (0.5") diameter mast with cotter pin and set screw
Tools required n/a 0.25 inch nut driver, petroleum jelly, electrical tape
Environmental  
Operating temperature range n/a -55 °C to 60 °C (-67 °F to 140 °F)
Operating humidity range n/a 0 to 100% RH
Physical  
Connections n/a 4-40 brass hex nut/post terminals
Weight n/a 0.14 kg (0.3 lbs)
Dimensions n/a
  • 3 cups of conical cross-section, 51 mm (2") dia.
  • 81 mm (3.2") overall assembly height
Materials  
Cups n/a One piece injection-molded black polycarbonate
Body n/a Housing is black ABS plastic
Shaft n/a Beryllium copper, fully hardened
Bearing n/a Modified Teflon, self-lubricating
Magnet n/a Indox 1, 25 mm (1 inch) diameter, 13 mm (0.5 inch) long, 4 poles
Coil n/a Single coil, bobbin wound, 4100 turns of #40 wire, shielded for ESD protection
Boot n/a Protective PVC sensor terminal boot included
Terminals n/a Brass

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