#40R Anemometer Menu▼

#40R Anemometer Menu


This anemometer is an improved version of the popular three-cup design used in wind assessments for decades. It is manufactured to precise industry standards. The rotor is made of tough polycarbonate for exceptional durability and reliability. The sensor base is also made of rugged polycarbonate, making it more resistant to damage during installation than our competition. A green molded vinyl boot protects the anemometer wiring. Made in the USA with exceptional quality control, all units are tested mechanically and electronically before shipping.

Internally, the #40R Anemometer has a fully hardened beryllium-copper shaft running in self-lubricating modified Teflon bearings. The rated bearing PV (pressure-velocity) factor is 20,000. At 15 MPH the PV is approximately 500. At 100 MPH the PV is approximately 2,000.

APRS World #40R Anemometer
Additional photos in our photo gallery.


Accuracy: Within 0.1 m/s (0.2 MPH) for the range 5 m/s to 25 m/s (11 MPH to 55 MPH)
Rotor Moment of Inertia: 92.2 x 10-6 kg-m2 (68 x 10-6S-ft2)
Distance Constant: 3.0 m (10 ft)
Calibration: Not individually calibrated.
Calibration statistically based on samples.
Output Signal
Sensor Type: Reed switch, dry contact. Frequency proportional to cup rotational speed.
Transfer Function: m/s = (Hz * 0.383) + 0.324
MPH = (Hz * 0.857) + 0.725
Protection: Metal Oxide Varistor (MOV) between terminals
Physical Properties
Cup Diameter: 51 mm (2 in)
Rotor Diameter: 190 mm (7.5 in)
Weight: 108 grams (3.8 oz)
Mounting and Wiring
Mounts On: 12.7 mm (0.5 in) round rod or tubing
Mounts Using: Set screw and cotter pin
Wiring Terminals: Two #4-40 brass screws with captive nuts

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Pricing and Purchasing

Now you can purchase these products directly through our sister website: Off Grid Options

#40R anemometer

$140.00 USD

Part: APRS6504
Weight: 0.50 lbs

#40R anemometer with dry contact reed switch and rubber boot.

Anemometer Cut Sheet

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#40R anemometer cable, 30.5 m (100 ft)

$35.00 USD

Part: APRSC1000
Weight: 2.50 lbs

Arctic Ultraflex Blue™, UV resistant, two Conductor / 20 AWG, power limited tray cable, 300 volt. This is our finest sensor cable and is exclusive to Off Grid Options / APRS World, LLC! It consists of two 20 AWG conductors protected by an ultra tough and highly flexible Arctic Ultraflex jacket. The cable remains flexible to -55°C (-67°F). Conductors are white and black. This is ideal cable for our #40R Anemometer.

Custom sizes available.

Anemometer / wind vane replacement boot, green, molded vinyl

$5.00 USD

Part: APRS6512
Weight: 0.13 lbs

Replacement molded vinyl boot for our #40R anemometer and wind vane. Not compatible with APRS6500 series anemometer.

Anemometer and wind vane splitter board

$15.00 USD

Part: APRS6510
Weight: 0.13 lbs

The splitter board allows up to three anemometers and one wind vane to be connected to the Wind Data Logger using normal CAT5 cables. It is compatible with our DIN rail mounting feet. Board dimensions are 72 mm x 44 mm (2.85 in x 1.75 in). This is needed when just the Wind Data Logger Module or one of the Starter or Basic Packages is used. It is not required when using any of the Outdoor Self-Contained Packages (AC, Solar or Polar edition).

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Mounting Options

Z-Boom, 330 mm (13 in) Offset

$23.00 USD

Part: APRS6608
Weight: 0.50 lbs

Z-boom for offset mounting of sensors. Standard size - 330 mm (13 in) offset. Custom sizes available upon request.

Note: This version does not come with the small holes pre-drilled.

Stub Mast, 279 mm (11 in)

$9.00 USD

Part: APRS6611
Weight: 0.20 lbs

Stub mast for mounting #40R anemometer or wind vane. Standard in Wind Data Logger packages that include the #40R Anemometer.

Note: This version does not come with the small holes pre-drilled.

Anemometer to 1/2" NPT female adapter, stainless steel

$35.00 USD

Part: APRS6607
Weight: 0.50 lbs

Anemometer to 1/2" NPT female adapter, stainless steel.

Anemometer to 1/2" NPT female adapter, aluminum

$25.00 USD

Part: APRS6609
Weight: 0.50 lbs

Anemometer to 1/2" NPT female adapter, aluminum, 6061-T6.

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Calibrated Anemometer

Anemometer, #40HC, Calibrated

$450.00 USD

Part: APRS6506
Weight: 1.00 lbs

Calibrated #40 hall effect anemometer. Includes calibration certificate.

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