The Woodward MFR300-71M is a rugged, passive magnetic speed sensor. It operates on the variable reluctance principle, where a permanent magnet and coiled conductor generate a changing magnetic field. As the teeth of a gear pass the sensor tip, they disrupt this magnetic field, inducing an AC voltage signal in the coil. The frequency of this signal is directly proportional to the rotational speed of the shaft. The "71M" suffix denotes specific factory configuration details such as electrical characteristics, connector type, cable length, and temperature rating. This sensor is a critical component for speed measurement in Woodward control and protection systems for gas turbines, steam turbines, and compressors, providing the primary speed feedback required for governing and overspeed protection. Its simple, robust design ensures high reliability in harsh industrial environments.

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