FIELD TEST COMPARISON OF THE MET ONE INSTRUMENTS’ 011 CLASS ONE ANEMOMETER

Met One Instruments learned long ago that new products are proven in the field NOT the laboratory, and the new 011 E-Class One Wind Sensor is no exception.

In November, 2011 the E-Class One was tested by Deutsche WindGuard resulting in a sensor classification rating of index 1.2A, 4.9B.

Immediately following the WindGuard classification, we initiated a field-test campaign at multiple wind farms throughout North America.  The tests are ongoing and being conducted under field conditions.  The tests compare bias and mean absolute error measurements of the 011 to other Class One and industry standard anemometers.

Test site terrain was generally flat but ranged in locations from Eastern Canada to the Rocky Mountain plains. Temperature measured at the test sites ranged from‐ 29° to +30°C during the 5 month testing period. This subjected each test location to a wide variation of weather conditions. Data collected through mid‐April 2012 was used in this analysis which enabled both winter and spring conditions to be evaluated.  Raw data was independently analyzed to remove icing events and tower shadow effects.  Mean wind speed data was normalized between 6.0 to 7.0 m/s.

Field testing consisted of co-locating the 011 with other Class One and industry standard anemometers. As can be seen, the data shows strong comparative mean wind speeds at all sites with correlations greater than 0.99x.  It should be noted that the correlation coefficients are significantly better between the Met One 011 and Vector A100 pairs which are both IEC classified as true Class 1 anemometers.

As the American wind industry continues to become more sophisticated and strives for less uncertainty in wind resource and turbine performance measurements, the accuracy of meteorological data will be scrutinized and used to explain over‐predicted wind farm energy production.  The importance of reliable and accurate wind measurements has been addressed by the Met One Instruments 011 E-Class One Wind Sensor.

Met One will be exhibiting the 011 at the AWEA Wind Resource & Project Energy Assessment Seminar in Pittsburg, PA on September 13-14.

Please contact rbeckius@metone.com or sales@metone.com Phone: 1.541.4717111 for pricing and availability.