In many industries knowledge of wind speed is essential for reasons of safety and productivity. For crane operators, civil engineers and mariners, it is often unsafe to work in high winds; on construction sites and landfills, understanding the behaviour of the wind is useful for pollution monitoring and odour control; and in the renewable energy sector wind resource assessments are required to assess the suitability of a particular site for the placement of wind turbines.
Anemometers are used to measure wind speed. Various types are available, which vary according to their measurement principle.
Cup anemometers are an industry standard for most types of wind measurement. The rotation of the cups generates an output signal that is directly proportional to the wind speed. They are reliable in a wide range of environments and can tolerate extremely high wind speeds with no compromise on accuracy.
Ultrasonic anemometers work by emitting acoustic resonances from one side of the unit to the other. There is change in wavelength according to the speed and direction of the passing wind. From this, an accurate wind speed measurement can be obtained. With no moving parts, ultrasonic anemometers are not subject to any physical constraints and can therefore detect the tiniest variation in the wind’s behaviour. They are lightweight, easy to deploy and require minimal maintenance.
Munro Instruments manufactures and supplies a range of cup and ultrasonic anemometers.
IM124 Cup Anemometer
Built to British Meteorological Office specification, the Munro IM124 Cup Anemometer responds to wind conditions with extraordinary accuracy. Requiring no external source of electricity, it generates an AC output signal that is proportional to the wind speed. Wind speed measurements can be monitored quickly and easily using a Wind Speed Dial Indicator (IM124A) or a small OLED digital display. These can be sited remotely at key vantage points, such as in a crane cabin or at the base of a crane.
The IM124 Cup Anemometer can also be used with the IM613 Wind Speed Alarm Unit, which computes the average wind speed over a six-second period and will energise visual and audible alarm circuits to warn the workforce when critical levels have been exceeded.
Various data loggers are also compatible with the IM124.
IM159 Mechanical Handheld Cup Anemometer & IM161 Digital Handheld Anemometer
Handheld Anemometers provide a quick, easy and inexpensive method of obtaining wind speed measurements. They are compact, self-contained instruments, which are easily transportable.
The IM159 is built to British Meteorological Office specification and is suitable for a wide range of applications (military, aviation, oil & gas, fire safety, meteorology). It contains no electronic parts and is safe to use in explosive zones. It can be calibrated to read in knots, mph, or m/s.
The IM161 is a lightweight, battery-powered unit with a clear LCD display. It shows the actual fluctuating wind speed for a 12-15 second period and also the highest gust during the last 10 seconds of display. It will also indicate the average wind speed over the sampling period. It can be calibrated to read in knots, mph, m/s or km/h (this can be changed by the user at a later date).
Both are tested in our UKAS-accredited wind tunnel prior to despatch and can be supplied with a Certificate of Conformity if required.
2-Axis and 3-Axis Ultrasonic Anemometers
We supply a range of 2-Axis and 3-Axis Ultrasonic Anemometers. If necessary, these can be fitted with a heater to prevent accumulation of ice and snow in low temperatures. They are designed for use with SDI-12-compatible data loggers. Please enquire for further information.
For more information, please email email@example.com or call +44 (0)20 8551 7000.
by Edmund Daley