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

Declaration of Conformity: NRG 40 Anemometer

Applications

Wind Resource Assessment

Recommended Items

Mounting Boom | 2.4m (95"), Lattice

Mounting Boom | 2.4m (95"), Tubular

Specifications Print Specs

Description
	MEASNET CALIBRATED (#1900)	CPH MEASNET CALIBRATED (#4350)
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

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 recorded)

Instrument compatibility

All NRG loggers

Output signal

Signal type

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

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 (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

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

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") 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") dia.
81 mm (3.2") 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 #40 wire, shielded for ESD protection
Boot: Protective PVC sensor terminal boot included
Terminals: Brass

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 recorded)

Instrument compatibility

All NRG loggers

Output signal

Signal type

Low level AC sine wave, frequency linearly proportional to wind speed

Anemometer Transfer Function

See individual calibration report

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 (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

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

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") 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") dia.
81 mm (3.2") 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 #40 wire, shielded for ESD protection
Boot: Protective PVC sensor terminal boot included
Terminals: Brass

Declarations of Conformity

Declaration of Conformity: NRG 40 Anemometer

Download pdf (728 KB)

Customer Service

+1 802-482-2255

Mon – Fri: 8:30am – 5:00pm Eastern Time (GMT-5)

Accessories

NRG 40C Anemometer

Configuration Options

Details

Applications

Wind Resource Assessment

Recommended Items

Mounting Boom | 2.4m (95"), Lattice

Mounting Boom | 2.4m (95"), Tubular

Specifications Print Specs

Product Support

2.4 m (95”) Side Mount Boom Installation for Tube Towers

2.4m (95”) Lattice Booms – Single/180°/120°

40C Anemometer Uncertainty

Interfacing to the NRG 40C Anemometer or IceFree3™ Heated Anemometer

NRG 40C Anemometer Packaging and Performance Certification

Testing NRG Class 1 and 40C Anemometers

The Maximum Type 40 Anemometer Test

40C Calibration Reports Available Online

Connecting a #40 anemometer or 200P wind vane to a Campbell Scientific datalogger

Converting Anemometer Calibration Report Values from m/s to mph

Does NRG offer anemometers calibrated under the MEASNET anemometer calibration procedure?

Effects of Air Density and Altitude on the NRG #40 Maximum Anemometer

Effects of Barometric pressure and relative humidity on cup anemometers

For interpreting 40C stored signal data, should I continue to use NRG’s published 40 Consensus Transfer Function (CTF), or should I use the specific wind tunnel, calibration test-derived value (value provided on calibration facility’s test certificate)?

How should I install the sensor boot to keep out water?

Installing NRG sensors on a lattice tower

Is the MEASNET sensor different from the 40C calibrated sensor?

NRG #40 anemometer on a non-NRG data logger cannot register a reading

Offset value of 0.35 (or 0.4) in windspeed readings

Transfer function of #40 does not change as sensor ages and endplay increases

Using a 40H instead of a regular 40C

Using scale and offset from calibrated anemometer with DL9210 software

Using the #40C in Conjunction with the Southwest Windpower Whisper Controller

Using the rubber sensor terminal boot with the #40 anemometer

Using very long cables with #40 anemometers

Using very long cables with NRG sensors

What are the main differences between the Class 1 Anemometer and the 40C Anemometer?

What is the class of the 40 Anemometer?

Why did NRG choose to only offer calibrated 40C Anemometers?

Wind speed-readings are zero

Technical Product Sheet: NRG 40 Anemometer

Technical Product Sheet: NRG 40 Anemometer (Chinese)

Declaration of Conformity: NRG 40 Anemometer

Customer Service

+1 802-482-2255

Accessories

Boom Extensions

Interface 40C to Logic Level, Speed Amp #892E

Interface #40 to Voltage, #SI5100

Sensor Cable Kit - 2C

Sensor Terminal Boot