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The SRW1G is a Windvane which uses a reed-switch/diode encoder together with a built-in mechanical compass system to convert the wind direction (relative to magnetic north) as sensed by the position of the F10 Series Fin into a Gray-coded parallel digital output suitable for loggers/PLCs.

The reed-switch encoder offers the advantage of virtually zero power consumption together with good sensitivity at low wind speeds.

While the relatively coarse resolution of the encoder (16 sectors) precludes accurate instantaneous measurements, the random nature of wind fluctuations together with the oscilliatory response of the vane allows accurate determination of the average wind direction from multiple samples.

Construction is from anodised aluminium alloys and stainless steels for exposed parts. Combined with precision bearings, the result is an instrument suitable for continuous exposure to the weather, with a long service interval.

A marine version (/WR) is available with enhanced sealing and a "skirt" for extra protection against the elements.

This windvane is Self Referencing, that is to say that the built-in mechanical compass system compensates for the variable position/orientation of mobile platforms (or platforms with unknown orientation), for example buoys at sea, and the wind direction is always measured relative to magnetic north. The logging/measuring equipment must, however, compensate for the local difference between magnetic and true north where appropriate.