NRG 40C Anemometer - Solar

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

Details
Specifications

Details

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.

Applications

Solar Resource Monitoring

Specifications Print Specs

Description
	MEASNET CALIBRATED (#14845)	NRG 40 ANEMOMETER (#14881)
Sensor type	n/a	3 Cup Anemometer
Applications	n/a	Solar resource assessment Meteorological studies Environmental monitoring
Sensor range	n/a	1 m/s to 96 m/s (2.2 mph to 215 mph) (highest recorded)
Instrument compatibility	n/a	All NRG loggers
Output signal
Signal type	n/a	Low level AC sine wave, frequency linearly proportional to wind speed
Anemometer Transfer Function	n/a	Consensus Transfer Function: Scale Factor (Slope): 0.765 m/s/Hz (1.711 mph/Hz) Offset: 0.35 m/s (0.78 mph) Note: Refer to the white paper "The Maximum Type 40 Anemometer Calibration Project" for more information on the consensus transfer function
Output voltage at threshold	n/a	80 mV (peak-to-peak) minimum
Output voltage at 60Hz	n/a	12 V (peak-to-peak) typical Output amplitude NOT proportional to wind speed
Output signal range	n/a	0 Hz to 125 Hz (at 96m/s, highest recorded)
Uncertainty	n/a	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 application note "#40C Anemometer Uncertainty" for definitions and more information
Response characteristics
Distance constant (63% recovery)	n/a	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	n/a	1.01 x 10^-4 kg-m² 74.5 x 10^-6 S-ft²
Swept diameter of rotor	n/a	190 mm (7.5 inches)
Installation
Mounting	n/a	Onto a 13 mm (0.5") diameter mast with cotter pin and set screw
Tools required	n/a	0.25 inch nut driver, petroleum jelly, electrical tape
Environmental
Operating temperature range	n/a	-55 °C to 60 °C (-67 °F to 140 °F)
Operating humidity range	n/a	0 to 100% RH
Physical
Connections	n/a	4-40 brass hex nut/post terminals
Weight	n/a	0.14 kg (0.3 lbs)
Dimensions	n/a	3 cups of conical cross-section, 51 mm (2") dia. 81 mm (3.2") overall assembly height
Materials
Cups	n/a	One piece injection-molded black polycarbonate
Body	n/a	Housing is black ABS plastic
Shaft	n/a	Beryllium copper, fully hardened
Bearing	n/a	Modified Teflon, self-lubricating
Magnet	n/a	Indox 1, 25 mm (1 inch) diameter, 13 mm (0.5 inch) long, 4 poles
Coil	n/a	Single coil, bobbin wound, 4100 turns of #40 wire, shielded for ESD protection
Boot	n/a	Protective PVC sensor terminal boot included
Terminals	n/a	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