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.

Performance

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

APRS World, LLC is a small and highly energetic company. We are a designer and manufacturer of renewable energy and industrial data logging and control equipment and systems.