ANEMOMETERS WITH WIND DIRECTION VANES

Compact and versatile design of MeteoWind® wind sensors meets strict requirements of wind resource assessment studies. MeteoWind® sensors take advantage of the registered elliptical cup design with its inherent accuracy and linearity advantages as compared with conical and round cups of existing state of the art anemometers. Please see FAQ for IEC 61400-12-1 Wind Resource Assessment.

Clarifications for the use of MeteoWind 2-in-1 Wind Speed & Direction Sensor with MEASNET Calibration in wind resource assessment when replacing existing Class 1 anemometers and wind vanes.

Customer requirement:

Our requirement is 120 units of anemometers and 60 units of wind vanes. IEC 61400-12-1 specifies clearly that no other instrument shall be positioned closer than 1.5 meters vertically from the anemometer cups and the wind vane shall be mounted at a minimum of 1,5 m below the primary anemometer. Moreover we install anemometers and wind vanes at different heights. Does MeteoWind 2-in-1 wind speed & direction sensor satisfy this requirement as they will measure at almost same height.

Answer:

This IEC 61400-12-1 requirement was written before the MeteoWind 2 wind sensors were developed. Further, MeteoWind is a single wind sensor measuring wind speed and direction and not two separate instruments as IEC 61400-12-1 assumes. 

• As logic would suggest, measuring wind speed and wind direction together at a single point creates much more meaningful data which can more accurately quantify turbulence and wind shadow effects of masts and wind turbines.
• As you can imagine, if a customer installs 120+60 MeteoWind 2, their data quality, data density, and data redundancy will be significantly higher than with separate installations of wind vanes and anemometer at the same total cost.

Customer requirement:

How does MeteoWind's configuration compare to the IEC 61400-12-1 requirement that no other instrument shall be positioned closer than 1.5 meters vertically from the anemometer cups.. Will it affect wind speed or wind direction data quality?

Answer:

In MeteoWind 2 configuration, wind shadow between wind vane and anemometer does not exist, therefore measurement is more accurate.  Current IEC 61400-12-1 requirements place the wind vane approximately 1.5 meters away from the anemometer which in separate anemometer and wind vane installations is logical due to wind shadow effects. Since MeteoWind wind vane is not a separate instrument, an exception applies.

• Sensor wind shadow effects are eliminated in MeteoWind wind sensor installations.
• Meteowind wind vane does not affect the wind speed due to its position, size and geometry.

Customer requirement:

Meteo tower and meteo mast cable lengths may differ as the tower heights are variable (i.e. 40m, 50m, 60m, 100m, etc.)

Answer:

MeteoWind 2 has a IP67 connector, therefore, cable length can be chosen per customer requirement. Whats more, MeteoWind 2 has the highest lightning protection currently available consisting of:

• over voltage protection
• high-speed over-current protection
• high-speed voltage protection

MeteoWind Lightning Protection meets the following international standards for industrial equipment safety:

• EMC Emissions according to EN50081-1 / IEC61000-6-1
• EMI Transients according to EN50081-1 / IEC61000-6-2
• SURGE test 4 kV / 2 kA acc.to EN50082-2 / IEC61000-6-2
• ESD 15000 V (15 kV)
• Link to lightning protection test report: Lightning Protection Certification (EMC test results)

The use of 3-stage lightning protection is complemented by the RS-485 digital output which has inherently high resistance to interference and is therefore the most widely used communication interface in tough industrial environments. Together, they are able to ground out any unwanted electrical interference from wired connections.

Customer requirement:

Can the MeteoWind wind sensors be mounted on existing Towers?

Answer:

MeteoWind can be mounted on any towers. If a special mount is required, Barani Design can develop and manufacture a mount for quantities >=100pcs.  Usually unit pricing for mounts can be around 20eur, depending on geometry.

Customer requirement:

Kindly confirm if Cloud Based Monitoring software can be supplied for wind monitoring with MeteoWind? If not, where will the data from the modem of the data logger be sent to, as the supplier has to ensure the compatibility of data logger to our server for remote monitoring.

Answer:

Data from EasyLogGSM or ProLogGSM data loggers can be collected on the allMETEO.com servers and exported at any time or retrieved via a secure API to the customer's software. Usernames and passwords for allMETEO.com accounts will be provided to all customers.

Customer may also choose to have the data from our data loggers sent directly to their servers via FTP protocol. 

Customer requirement:

Installation work is in our scope, but the selected bidder needs to provide demonstration of all the equipment /sensors to our team.

Evaluations of MeteoWind anemometers can be provided free of charge as long as BARANI DESIGN receives documentation and complete reports of the evaluation including installation pictures. After the evaluation period expires, if a first order is placed, the customer may keep the evaluation hardware free of charge or if an order is not placed, purchase the hardware at a 50% discount if the hardware is not returned at the end of the evaluation period.