WindSensor P2546A-OPR Cup Anemometer



The WindSensor P2546A-OPR Cup Anemometer has been discontinued and is no longer available for purchase. Please use the P2546D-OPR electronic version as a direct replacement. See technical note for replacing the P2546A-OPR reed switch version.

We also offer the P2546C-OPR coil version.

The WindSensor P2546-OPR Cup Anemometer combines unrivaled performance with the only IEC 61400-12-1 compliant classification on the market. Originally designed for marine environments, the P2546-OPR is ideally suited for wind resource assessment and power performance studies both onshore and offshore.>

The P2546A-OPR (reed switch version) features permanent magnets mounted on the shaft that activates a reed switch contact. This generates a potential free switch signal with a frequency proportional to the wind speed.

P2546-OPR features

  • One-piece rotor anemometer head (OPR)
  • Durable construction with anodized aluminum and stainless steel
  • Low threshold speed
  • Short distance constant
  • Negligible overspeeding
  • Angular response independent of wind speed
  • Fully tested temperature performance
  • Symmetrical geometry
  • No external power source
  • MEASNET calibrated


Sensor type 3-cup anemometer
Applications Wind resource assessment
Wind turbine power performance measurement
Meteorological and environmental monitoring
Response characteristics
Calibration Each anemometer individually calibrated compliant with IEC 61400-12-1
Calibration, mean value U = 0.620 x f + 0.21 [m/s]
Variation of calibrations σ = 0.015 m/s @ 10 m/s
Distance constant (63% recovery) 1.81 ± 0.04 m
Starting threshold < 0.4 m/s
Resolution 0.001 m/s @ 10-minute average mode
Range 0...75 m/s
Output signal
Signal type Switch closure, frequency proportional to wind speed
Duty cycle 40...60 %
Max switching voltage 30 V
Max recommended switching current 10 mA
Output resistance 330 Ω, 1 W
Calibration uncertainty, uV1, k=1 0.28 % @ 4…16 m/s
Classification uncertainty, uV2, k=1
Class number   Operational standard uncertainty @ 10 m/s
1.32A   0.076 m/s
3.71B   0.214 m/s
1.54C   0.089 m/s
3.76D   0.217 m/s
0.03...3.76S   0.002...0.217 m/s
Power supply
P2546A-OPR Self-excited, pull-up resistor of 10…100 kΩ required
Operating temperature range -38...60 °C
Operating humidity range 0...100 % RH
EMC compliance EN61326-1 Class A
Exterior materials Anodized aluminum, Stainless steel and GRP
Mating cable connector Lemo E Series FFA.1E.650.CTAC45 (cable diameter 4.1…4.7 mm)
Overall height 282 mm
Swept diameter of rotor 188 mm
Weight 0.40 kg
Shipping weight / dimensions 1.15 kg / Cardboard box 360 x 230 x 210 mm
Mounting Onto a 25 ±0.1 mm (0.984 inch) diameter tube with two set screws
Tools required 4 mm Allen wrench (enclosed)


Specifications documents

Application notes

External documentation

Campbell dataloggers - P2546A-OPR Anemometer Instruction Manual

Click to view larger image

To place an order or inquire about this product,
please submit an online order or inquiry or contact us.