Measuring speed of three wire 24V DC fan with Arduino

Dear all,

I’am new with Arduino. I need help with measuring speed of 3-wire 24VDC fan, and how to connect that
type of fan to Arduino. Manufacturer of fan is EBM PAPST (type: 624/2 HH), there is 3 wires on fan (red wire is +, blue wire is -, white wire is Tacho signal, see atachement).
For my project I only need to measure speed of fan.
Thank you in advance

Hrvoje

24VDCfan.png

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