ET 4000 Wind Industry Standard Anemometer

$93.00 — $123.00

This is an improved version of the #40 anemometer utilized for years by the wind power industry for resource assessment.  Available in 3 versions, AC generator, Reed Switch, or Hall Effect.  Cups and body are molded polycarbonate.

Specification::

• Conical cups measure 51 mm (2 inches) in diameter • Rotor diameter is 190 mm (7.5 inches) • Standard AC output, frequency proportional to cup rotational speed • Shielded AC pickup coil, 4100 turns of #41 wire • Four-pole Indox 1 magnet rotates with the cup assembly • Fully hardened beryllium-copper shaft running in self-lubricating modified Teflon bearings • Protective boot to make the system dirt and water resistant • Rated bearing PV (pressure-velocity) factor is 20,000 – At 15 mph PV is approx. 500. – At 100 mph PV is approx. 2,000. • Rotor assembly moment of inertia = 68 x 10–6 S-ft2 (or 92.2 x 10–6 kg-m2) • Distance constant = 10 feet (3.0 meters) • Transfer Function: m/s = (Hz x 0.766) + 0.324 [miles per hour = (Hz x 1.714) + 0.725] • Accuracy: within 0.1 m/s (0.2 mph) for the range 5 m/s to 25 m/s (11 mph to 55 mph)