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Windspeed Ltd (Vector Instruments), 113 Marsh Road, RHYL, N. Wales, LL18 2AB, United Kingdom.
Windspeed Limited
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 Monday, July 22 2024  Home [arrow]  Products [arrow]  Windvanes [arrow]  SRW1G Search site:  

Latest Weather...
(Rhyl, N.Wales, UK)
Wind Speed:  5.2 mph
Wind Direction:  233 °
Air Temp.:  15.5 °C
Rel. Humidity:  91.1 %
Rain (last Hr):  0.0 mm
(updated at: 21:10 UTC)

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Celebrating more than 50 years manufacturing & servicing High Quality Vector Instruments Anemometers and Windvanes at Windspeed Ltd
SRW1G Self-Referencing Encoder Windvane

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.

The output of this instrument is Gray-code which means that each sector generates a code (bit-pattern) where only one bit changes relative to the adjacent sectors (unlike binary where multiple bits could change). The purpose of this is to assist the measuring equipment in detecting noise, interference and errors.

The recommended mounting adaptors for use with this instrument are our type 405 and 405-1L series.

Specification Highlights:

  • Threshold:
  • 0.75m/s
  • Maximum Wind Speed:
  • over 75 m/s
  • North Setting:
  • +/-2°
  • Temperature Range:
  • -55°C to +70°C
  • Life:
  • Reed-switches rated in excess of 50 million operations (corresponds to over 10 years continuous exposure)
  • Operating Voltage Range:
  • 1V to 30V DC
  • Output Signal/Code:
  • 4-bit Gray Code (equivalent to 4 switch closures with a common positive line)
  • Number of sectors:
  • 16
  • Sector Angle:
  • 22.5°
  • Resolution:
  • 22.5° instantaneous (effectively infinite after averaging).
  • Accuracy:
  • +/-5° obtainable following averaging.
  • Connections:
  • 6 wire screened cable. Screen insulated at instrument end, black connects to body. Red is common positive (supply), blus, green, yellow, white carry 4-bit gray code output data (lsb..msb).
  • Dimensions:
  • This instrument is constructed using our standard self-referencing windvane body design and dimensions.

    This product is manufactured to special order .
  • Reliability & Safety
  • Specifications are correct at time of writing and may change without notice. Please contact us to confirm the latest specifications.
    Please call/email us if you would like access to additional product information, data and specification sheets for this product.
    Windspeed Ltd (Vector Instruments)
    Windspeed Limited (trading as Vector Instruments),
    113 Marsh Road, RHYL, North Wales, LL18 2AB, United Kingdom
    Tel: +44 (0) 1745 350700
    Website design and content is copyright (c) 2003-2024 Windspeed Limited (unless otherise stated). All trademarks are acknowledged.