Wind Set WA25

Vaisala Wind Set WA25 is a high-quality cup and vane wind measurement station designed for arctic conditions. WA25 consists of Vaisala Anemometer WAA252, Vaisala Wind Vane WAV252, an optional cross-arm, a power supply, and cabling.

Heating provides resistance to snow and ice

Most of the heating power is consumed where it is needed most – in the cups and vane. Foil heaters, integrated into the cups and vane, prevent snow buildup and ice formation.

Heating power is also supplied to the sensor shafts, bearings, and bodies. This keeps the sensor bodies free of ice, which is important for maintaining the aerodynamic performance.

Anemometer with excellent linearity

WAA252 is a fast-response, lowthreshold anemometer. Three lightweight, conical cups mounted on the cup wheel provide excellent linearity over the entire operating range, up to 75 m/s (168 mph).

A wind-rotated chopper disc attached to the shaft of the cup wheel cuts an infrared light beam 14 times per revolution. This generates a pulse output from a phototransistor.

The output pulse rate is directly proportional to wind speed (for example, 246 Hz = 24.6 m/s). However, for the highest accuracy, the characteristic transfer function must be used to compensate for starting inertia

Sensitive wind vane

WAV252 is a counterbalanced, lowthreshold, optoelectronic wind vane providing a 6-bit GRAY coded message. Turned by the vane, the disc creates changes in the code received by the phototransistors. The code is changed in steps of 5.6°.

Complete package available

The anemometer and vane are designed to be mounted on Vaisala cross-arms.