Bently Nevada 89411-01 Magnetic Tachometer / Speed Sensor

FAQ

Q1: What is the Bently Nevada 89411‑01 used for?
A1: It is a magnetic pickup speed sensor used to detect the rotation of a ferrous target such as a shaft, gear, or reluctor wheel and generate AC voltage pulses for speed or phase measurement.

Q2: How does this magnetic pickup work?
A2: It uses an inductive principle: as a ferrous object passes near the sensor tip, it induces voltage spikes in the sensor coil proportional to the relative speed and target characteristics.

Q3: Does the 89411‑01 require external power?
A3: No — it is a passive sensor that generates its own AC output signal when a ferrous target moves past the sensor tip.

Q4: What type of output signal does it provide?
A4: It provides AC voltage pulses whose frequency corresponds to the rotational speed of the machine and whose amplitude depends on the speed and geometry of the target.

Q5: What environments is this sensor suitable for?
A5: It is suitable for rugged industrial environments where rotating machinery speed and phase reference signals are needed.

Q6: What is the typical operating temperature range?
A6: The sensor can operate in industrial environments from about −40 °C to +120 °C.

Q7: How is this sensor typically installed?
A7: It is mounted near a rotating ferrous target such that its tip faces the target with a small, controlled air gap for signal consistency.

Q8: Are additional components needed to use this sensor?
A8: Yes — the sensor’s output is typically connected to tachometer or monitoring electronics (e.g., PLC inputs, vibration analyzers) that interpret the frequency or speed information.

89411-01 Bently Nevada

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