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NRG 40H Anemometer

The 40H Anemometer is an unheated three-cup anemometer that provides high precision wind speed measurements.

  • NRG 40H Anemometer
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Configuration Options

The 40H is based on the NRG 40C Anemometer, one of the first anemometers designed exclusively for the wind industry. This Hall Effect version is engineered for electrically noisy environments and instrumentation that requires a square wave signal. The 40H is most commonly used as a control sensor, either on small wind turbines or to trigger PV tracker stowing in dangerously high winds.

The 40H’s Hall Effect switch produces a high level square wave voltage signal with a frequency proportional to wind speed. This signal is easy to interface to a wide range of industrial devices including turbine controllers, programmable logic controllers (PLCs), and data loggers. A 5-26V DC excitation voltage with 5 mA of current is required.

Constructed of rugged Lexan cups, the 40H is molded in one piece for repeatable performance. A PVC terminal boot is included with each anemometer for additional protection from the elements.


  NRG 40H Anemometer (#5930) MEASNET Calibrated (#2551)
Description  
Sensor type 3 Cup Anemometer 3 Cup Anemometer
Applications
  • Wind turbine control
  • Wind speed measurement for programmable controllers
  • Wind resource assessment
  • Meteorological studies
  • Environmental monitoring
  • Wind turbine control
  • Wind speed measurement for programmable controllers
  • Wind resource assessment
  • Meteorological studies
  • Environmental monitoring
Sensor range 1 m/s to 96 m/s (2.2 mph to 215 mph) (highest recorded) 1 m/s to 96 m/s (2.2 mph to 215 mph) (highest recorded)
Instrument compatibility Controllers or loggers requiring a square wave signal Controllers or loggers requiring a square wave signal
Output signal  
Signal type
  • Square wave signal from open collector transistor
  • External pull-up resistor required
  • Frequency proportional to wind speed
  • Square wave signal from open collector transistor
  • External pull-up resistor required
  • Frequency proportional to wind speed
Anemometer Transfer Function m/s = (Hz x 0.765) + 0.35
[ miles per hour = ( Hz x 1.711 ) + 0.78 ]
m/s = (Hz x 0.765) + 0.35
[ miles per hour = ( Hz x 1.711 ) + 0.78 ]
Recommended load resistance
  • output sinks up to 20 mA
  • 3300 Ohm typical pull-up resistor for 24 V
  • 1500 Ohm typical pull-up resistor for 12 V
  • 330 Ohm typical pull-up resistor for 5 V
  • output sinks up to 20 mA
  • 3300 Ohm typical pull-up resistor for 24 V
  • 1500 Ohm typical pull-up resistor for 12 V
  • 330 Ohm typical pull-up resistor for 5 V
Calibration Purchase #2551 for MEASNET calibration. Purchase #2551 for MEASNET calibration.
Output signal range 0 Hz to 125 Hz 0 Hz to 125 Hz
Response characteristics  
Threshold 0.78 m/s (1.75 miles per hour) 0.78 m/s (1.75 miles per hour)
Distance constant (63% recovery) 3.0 m (10 feet) 3.0 m (10 feet)
Moment of inertia 68 x 10-6S-ft2 68 x 10-6S-ft2
Swept diameter of rotor 190 mm (7.5 inches) 190 mm (7.5 inches)
Power requirements  
Supply voltage 5 V to 26 V DC 5 V to 26 V DC
Supply current 9 mA maximum 9 mA maximum
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
Accessories Protective PVC sensor terminal boot included Protective PVC sensor terminal boot included
Environmental  
Operating temperature range -55 °C to 60 °C (-67 °F to 150 °F) -55 °C to 60 °C (-67 °F to 150 °F)
Operating humidity range 0 to 100% RH 0 to 100% RH
Physical  
Connections 4-40 brass hex nut / stud terminals 4-40 brass hex nut / stud terminals
Weight 0.14 kg (0.3 pounds) 0.14 kg (0.3 pounds)
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 Black ABS plastic Black ABS plastic
Shaft Beryllium copper, fully hardened Beryllium copper, fully hardened
Bearing Modified Teflon, self-lubricating Modified Teflon, self-lubricating
Boot Protective PVC sensor terminal boot included Protective PVC sensor terminal boot included
Terminals
  • Brass terminal studs
  • Nickel plated brass nuts
  • Brass terminal studs
  • Nickel plated brass nuts
Boom Extensions

Boom Extensions

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

Sensor Cable Kit - 3C

Sensor Cable Kit - 3C

Use this three-conductor (3C) cable for unheated vanes and Hall Effect anemometers.

Sensor Terminal Boot

Sensor Terminal Boot

Protect your sensor terminal from exposure to the elements with a terminal boot.

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).