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Effects of Air Density and Altitude on the NRG #40 Maximum Anemometer

The #40 anemometer is a drag device and air density will not affect the transfer function. The published transfer function should be used at any altitude. As an example, consider the case of an anemometer placed into a stream of moving water. Water is many times more dense than air (1 gram / cubic cm water, .0013 gram / cubic cm air). The #40 placed into a moving stream measures the correct speed of the flow of water. Simply put, lift based devices with an air-foil such as wind turbines are affected by changes in air density, drag based devices such as cup anemometers are not affected by air density.


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