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Wind Monitor Systems

- NRG sensors & logger

SENSORS: STANDARD

The NRG #40 Maximum anemometer is the industry standard anemometer used worldwide. NRG #40 anemometers have recorded wind speeds of 96 m/s (214 mph). Their low moment of inertia and unique bearings permit very rapid response to gusts and lulls. Because of their output linearity, these sensors are ideal for use with various data retrieval systems.

A four pole magnet induces a sine wave voltage into a coil producing an output signal with a frequency proportional to wind speed. The #40 is constructed of rugged Lexan cups molded in one piece for repeatable performance. A rubber terminal boot is included



For more detail log on to http://www.nrgsystems.com

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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 214 mph) (highest recorded)
    Instrument compatibility all NRG loggers
    Output signal
    Signal type low level AC sine wave, frequency linearly proportional to windspeed
    Transfer function m/s = (Hz x 0.765) + 0.35
    [miles per hour = (Hz x 1.711) + 0.78]
    Accuracy within 0.1 m/s (0.2 mph) for the range 5 m/s to 25 m/s (11 mph to 55 mph)
    Calibration calibrated version available
    Output signal range 0 Hz to 125 Hz (highest recorded)
    Response characteristics
    Threshold 0.78 m/s (1.75 miles per hour)
    Distance constant (63% recovery) 3.0 m (10 feet)
    Moment of inertia 68 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 pounds)
    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 black ABS plastic
    Shaft beryllium copper, fully hardened
    Bearing modified Teflon, self-lubricating
    Magnet Indox 1, 25 mm (1 inch) diameter, 13 mm (0.5 inch) long, 4 poles
    Coil single coil, bobbin wound, 4100 turns of #41 wire, shielded for ESD protection
    Boot protective PVC sensor terminal boot included
    Terminals brass