The Thies First Class wind vane is one of the most common wind vanes used in wind resource assessment to determine the wind direction.

Features:

High level of measuring accuracy and resolution
High damping ratio at a small delay distance
Low starting threshold
Magnetic coupling, which is free of hysteresis and wear, situated between the axis of vane and potentiometer

In order to prevent the ball bearing and the external rotation parts from freezing, the wind vane can be ordered with an optional electronically regulated heating system for wintertime use.

Add a Geovane to your wind vane

Given the impact incorrect wind direction measurements have, the recently updated IEC61400.12.1 (2017) now requires complete assessment of wind direction measurement uncertainties. By adding a Geovane to your wind measurement campaign (in combination with either a Thies First Class or a Thies Compact wind vane) you will get the most accurate wind direction data available on the market.

DATA	UNITS
Measuring range:	0 … 360 °
Measuring accuracy:	0.25% (1°)
Survival speed:	85 m/s up to 0.5 h (without damages)
Permissible ambient conditions for operation:	-50 to +80°C all occurring situations of rel. humidity incl. dew moistening < 0.2 m/s at 90° amplitude (acc. to VDI 3786 Part 2)
4.3151.x0.212:	2 KΩ Potentiometer
4.3151.x0.210:	10 KΩ Potentiometer
Linearity:	0.25% (1°)
Starting threshold:	< 0.5 m/s at 10° amplitude (acc. to ASTM D 5366-96)
Delay distance:	< 1.8 m (acc. to ASTM D 536696)
Damping ratio:	D > 0.3 (acc. to ASTM D 536696)