NRG 40C Anemometer

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

Details

The 40C was one of the first anemometers designed exclusively for the wind industry.

The 40C Anemometer has recorded wind speeds of 96 m/s (214 mph). Their bearings and low moment of inertia permit very rapid response to gusts and lulls. Due to 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 frequency proportional to wind speed.

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

A MEASNET calibration certificate is available for each sensor: Download Calibration Report.

White Papers (1)

Post Calibrating the 40C Anemometer in the SOH Wind Engineering (SOH WE) Wind Tunnel

Instruction Sheets (7)

FAQs (23)

Technical Product Sheets (1)

Technical Product Sheet: #40

Applications

Wind Resource Assessment

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Specifications Print Specs

	MEASNET Calibrated (#1900)	CPH MEASNET Calibrated (#4350)
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 recorded)	1 m/s to 96 m/s (2.2 mph to 215 mph) (highest recorded)
Instrument compatibility	All NRG loggers	All NRG 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	Consensus Transfer Function: Scale Factor (Slope): 0.765 m/s/Hz (1.711 mph/Hz) Offset: 0.35 m/s (0.78 mph) Refer to the white paper "The Maximum Type 40 Anemometer Calibration Project" for more information on the consensus transfer function All NRG 40C Anemometers are calibrated per IEC 61400-12-1, Annex F	See individual calibration report
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 (at 96m/s, highest recorded)	0 Hz to 125 Hz (at 96m/s, highest recorded)
Uncertainty	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 calibration sheet for information on calibration uncertainty Refer to application note "#40C Anemometer Uncertainty" for definitions and more information	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 calibration sheet for information on calibration uncertainty Refer to application note "#40C Anemometer Uncertainty" for definitions and more information
Response characteristics
Distance constant (63% recovery)	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	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	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") diameter mast with cotter pin and set screw	Onto a 13 mm (0.5") 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") dia. 81 mm (3.2") overall assembly height	3 cups of conical cross-section, 51 mm (2") dia. 81 mm (3.2") overall assembly height
Materials
Cups	One piece injection-molded black polycarbonate	One piece injection-molded black polycarbonate
Body	Housing is black ABS plastic	Housing is black ABS plastic
Shaft	Beryllium copper, fully hardened	Beryllium copper, fully hardened
Bearing	Modified Teflon, self-lubricating	Modified Teflon, self-lubricating
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