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.

Details

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

Brochures (2)

White Papers (1)

Characterization + Classification of the Class 1 Anemometer for IEC 61400‐12‐1 Compliance

Quick Guide Videos (1)

NRG Class 1 | Initial Setup

Instruction Sheets (3)

FAQs (11)

Applications

Wind Resource Assessment

Recommended Items

Mounting Boom | 2.4m (95"), Tubular

Mounting Boom | 2.4m (95"), Lattice

Specifications Print Specs

	MEASNET Calibrated (#5966)
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