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WindSensor P2546-OPR Anemometer

The WindSensor P2546-OPR anemometer combines class 1 performance with unrivaled durability.

  • WindSensor P2546-OPR Anemometer
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Configuration Options

Originally designed for marine environments, the P2546-OPR is ideally suited for wind resource assessment and power performance studies both onshore and off.

There are two versions of the P2546-OPR sensor: the P2546C-OPR (coil version) and the P2546A-OPR (reed switch). Both versions of the sensor are fully compatible with all Symphonie series data loggers. However, NRG discontinued sales of the P2546A-OPR Anemometer as of July 2017 due to restrictions related to its mercury content. You will need to use Signal Conditioning Modules (SCM) when connecting more than six anemometers to a SymphoniePLUS®3 Data Logger; please see the table below for details. These sensors can also be integrated seamlessly with our .

Signal Conditioning Module Compatibility
Sensor ModelSymphonie Logger ModelSignal Conditioning Module
P2546A-OPR SymphoniePLUS3 and older SCM #3151 | Digital Anemometer
  SymphoniePRO None required
P2546C-OPR SymphoniePLUS3 and older SCM #3148 | Coil Anemometer
  SymphoniePRO None required

Note: The P2546A-OPR contains 40mg of mercury and is no longer available for sale from NRG. We will reclaim and recycle the P2546A-OPR for our customers at no cost. For more information, please read our Recycling Return Policy.

  • One-piece rotor anemometer head (OPR)
  • Durable construction with anodized aluminum and stainless steel
  • Low threshold speed
  • Low distance constant
  • Negligible overspeeding
  • Angular response independent of wind speed
  • Fully tested temperature performance
  • Symmetrical geometry
  • No external power source
  • MEASNET calibrated
  MEASNET Calibrated (#6625)
Sensor type 3-cup anemometer
  • Wind resource assessment
  • Meteorological studies
  • Environmental monitoring
Sensor range 0 m/s to 75 m/s (0 mph to 168 mph)
Instrument compatibility All NRG 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 transfer function.
Output voltage at threshold
  • 80 mV (peak-to-peak) minimum
Output voltage at 60Hz
  • 14 V (peak-to-peak) typical
  • Output amplitude NOT proportional to wind speed
Calibration Each anemometer individually calibrated, calibration reports provided via electronic download
  • Nonlinearity <0.04 m/s (0.09 mph)
  • Standard deviation of slope 0.027 m/s (0.060 mph)
  • Standard deviation of offset 0.014 m/s (0.031 mph)
Output signal range 0 Hz to 120 Hz
Uncertainty IEC 61400-12-1 Classification
  • Class 1.32A
  • Class 3.71B
    Class S numbers can be calculated for any combination of influence parametrs within the Class B influence parameter ranges using WindSensor's class calculator.
Response characteristics  
Threshold < 0.4 m/s (0.9 mph)
Distance constant (63% recovery) 1.81±0.04 m (5.94 ±0.13ft )
Moment of inertia 1.01× 10-4 kg-m2 (7.45 × 10-5 S-ft2 )
Swept diameter of rotor 187 mm (7.36 inches)
Mounting Onto a 25 mm (0.984 inch) diameter mast with two set screws
Tools required 4mm Allen wrench
Operating temperature range -35 °C to 60 °C (-31 °F to 140 °F)
Operating humidity range 0 to 100% RH
Connections Push-pull connector (purchased separately)
Weight 0.36 kg (0.8 pounds)
  • 3 cups of conical cross-section
  • 70 mm (2.76 inches) dia.
  • 282 mm (11.10 inches) overall assembly height
Cups Robust one-piece injection molded polycarbonate/glass blend
Body Anodized aluminum
Shaft Stainless steel
Bearing Stainless steel ball bearings
Magnet One permanent ring magnet
Boom Extensions

Boom Extensions

Extend and retrofit NRG booms to meet your project’s needs with our boom extensions and adapter kits.

Symphonie® SCM Card

Symphonie® SCM Card

Condition your sensor’s output signal so that a SymphoniePLUS3 Data Logger can read it by installing a Symphonie Signal Conditioning Module (SCM).