The NRG #40 anemometer is the standard anemometer used in the wind energy industry. A calibrated Hall Effect version of this sensor is available for electrically noisy environments and instrumentation requiring a square wave signal. NRG #40 anemometers have recorded wind speeds of 96 m/s (214 mph). Their low moment of inertia and unique bearings permit very rapid response to gusts and lulls. Because of their output linearity, these sensors are ideal for use with various data retrieval systems. A Hall Effect switch induces a square wave voltage, producing an output signal with a frequency proportional to wind speed. A 5 to 24 VDC excitation voltage with 5ma of current is required. The #40H is constructed of rugged Lexan cups molded in one piece for repeatable performance. A rubber sensor terminal boot is included.