Anemometers and Windvanes in action!
Windspeed Ltd (Vector Instruments), 113 Marsh Road, RHYL, N. Wales, LL18 2AB, United Kingdom.
Windspeed Limited
Click for info on: Wind Speed sensors Click for info on: Wind Direction Sensors Click for info on: Masts + Mountings Click for info on: Air Temperature sensors Click for info on: Masts + Mountings Anemometer, Windvane and Air Temperature sensors
 Friday, May 09 2025  Home
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Latest Weather...
(Rhyl, N.Wales, UK)
Wind Speed:  2.6 mph
Wind Direction:  183 °
Air Temp.:  5.2 °C
Rel. Humidity:  93.1 %
Rain (last Hr):  0.0 mm
(updated at: 05:14 UTC)

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Celebrating more than 50 years manufacturing & servicing High Quality Vector Instruments Anemometers and Windvanes at Windspeed Ltd
Dual Mounting Arms (Cross-Arms), types 405-1 and 405-1L
 
Note: The type "405-1" family of dual-mounting arms (cross-arms) shown on this page is available only until stocks are exhausted.
Equivalent functionality can be realised using two of our new type "415" side-arms which have the added ability to mount to a much wider range of mast/pole/tower sizes/shapes.

A dual-mounting arm (also known as a cross-arm) is a convenient method of mounting both windspeed and direction sensors on one mast top. The close proximity of anemometer and windvane when mounted on a dual-mounting arm can affect the accuracy of the measurement, so for high-precision applications (e.g. wind assessment) we recommend that only our 405 single-mount or side-arms/booms are used in those cases.

The 405-1 uses a similar top fitting to the 405 single instrument mount, but includes a dual mounting arm with attachment points for an anemometer and windvane at either end giving a 500mm spacing between them.

dual/cross arms for A100 and W200 wind sensors

Note that there will be a degree of "shading" of the instruments for some wind directions (i.e. one instrument can interfere with the wind flow before it reaches the other) and there is a longer version (with 600mm instrument spacing), the 405-1L, which reduces this effect (and should always be used for mounting the larger SRW1G windvane).

405-1/135 and 405-1L/135 versions of these mountings are available for both which have a larger top-fitting, which (like the 405/135 single mount variant) will fit over a 1.35" diameter mast/pole (i.e. 1" BSP). Other sizes and custom top-fittings are available to fit other mast top dimensions (please enquire).

Dimensions of 405-1 series cross-arms for A100 and W200P series wind sensors

Note that a 405-OM mount can be used to mount a T351 series temperature sensor to the centre of a 405-1 or 405-1/135 cross-arm.

 
Windspeed Limited (trading as Vector Instruments),
113 Marsh Road, RHYL, North Wales, LL18 2AB, United Kingdom
Tel: +44 (0) 1745 350700
Email: sales@windspeed.co.uk
 
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