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#40c on a Nomad2


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Hi -

The "H" in #40H stands for "Hall Effect". 

The #40 and #40H  anemometers are essentially the same except for the signal pickup transducer.  The #40 uses a 600 ohm signal coil and the 40H uses a Hall Effect device.  Both the coil and the Hall Effect device pick up the magnet's field as it rotates past them. 

The 40H is an "active" device and requires DC excitation from the logger in order to function. The coil version is passive and generates it's own signal from the magnet!

For the 40H, the logger circuit will also need a properly sized  "pull-up" resistor. 

For more detailed information see the application note "#40H Hall Effect Maximum Anemometer".



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