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| Mounting Adaptors, Hardware, Masts and Junction Boxes |
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A range of mounts and adaptors are available to simplify fixing of our anemometers and windvanes to a mast.
405 Single mast mounts for anemometers and windvanes are the preferred solution, but if mounting both sensors at the same height, there will be some interference to the airflow which will reduce accuracy of reading, depending on the mast top diameters and separation distance.
405-1 Dual mounting arms are also available, but are not suitable for wind assessment applications due to the relatively close spacing of the instruments and the likelihood of interference. Better results may be obtained by mounting the anemometer on a pole at the top of the mast while mounting the windvane on a side-arm or boom lower down the mast.
For quoted/highest accuracy, and MEASNET calibrations, use the 405 mounts with A100 series anemometers.
For best accuracy in all applications, it is preferable to mount the anemometer in such a way that the mast/structure does not interfere with the airflow "seen" by the anemometer.
The IEA-11 and IEC 61400-12-1 standards have guidance on masts, and anemometer/windvane mounting to obtain the best results in wind assessment and wind turbine testing applications. Typical recommendations include mounting the top-most anemometer on a thin round pole at least 6 mast-diameters (typically 15 to 25) above the main structure of the mast, and in the case of instruments mounted part-way up the mast, mount on side booms (with a round cross-section and an upright pole at the end) such that the instruments are at least 6 mast-diameters (typically 15 to 25) away from the mast structure while also taking into account the prevailing wind direction (the upright pole should be thin and typically around 0.75m long). We recommend that the "thin pole" sections referred to are 1 inch outside diameter and that our 405 mount be used to fix the anemometer to the end. Consult a specialist or the standards mentioned for full details, many mast manufacturers can offer suitable booms.
Several types of Junction Box are available for joining instrument cables and/or extension cables, however many customers prefer to have long cables fitted (up to 100m) to their anemometers and windvanes at the time of manufacture instead for increased reliability.
Many mounting adaptor variants are available (not all are shown on this site) to suit different mast sizes - please contact us if you cannot find a suitable adaptor here.
We do not manufacture masts however we would be pleased to recommend a selection of mast manufacturers should you need something larger or more sophisticated - please contact us.
The choice of a mast and the positioning and siting of the wind measuring instruments usually depends upon a number of factors, and is normally some sort of compromise...
- The reason for making the wind measurements
...(i.e. what wind actually needs to be measured: general wind conditions or wind close to a roof for example).
- The availability of a mounting/installation site and strong anchoring points.
- Security and resistance to vandalism.
- Lightning protection requirements.
...these points are discussed in our Siting Guidelines and Lightning Protection Guidelines. The effect of lightning protection measures (e.g. rods) and guy-wires on the airflow should be considered when deciding on a mounting arrangement.
- For guidance on masts/booms in wind assessment (or wind turbine power performance testing) applications, refer to IEA-11 and IEC 61400-12-1.
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Windspeed Limited (trading as Vector Instruments),
115 Marsh Road, RHYL, North Wales, LL18 2AB, United Kingdom
Tel: +44 (0) 1745 350700 Fax: +44 (0) 1745 344206
Email: sales@windspeed.co.uk
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Website design and content is copyright (c) 2003-2010 Windspeed Limited (unless otherise stated). All trademarks are acknowledged.
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A100 Series Anemometers