Vibration Sensors

Electrodynamic Velocity Sensor

Principle of reciprocal pendulum type sensor is to induce voltage by reciprocal motion of the seismic mass with a coil in the magnetic field being suspended by a diaphragm or coil spring.

Principle of reciprocal pendulum type sensor is to induce voltage by reciprocal motion of the seismic mass with a coil in the magnetic field being suspended by a diaphragm or coil spring. Because of its high sensitivity and advanced linearity, it is suitable for detection of malfunction or deterioration of rotational machineries. Due to its structure, mounting should be done carefully for its direction or angle.

Features

High sensitivity, stable performance, advanced linearity in wide amplitude range

Relatively large output

Because of small internal resistance, long cable can be used.

External power supply is not necessary (self – power generation)

Suitable for sleeve bearing vibration measurement

Frequency response

The upper frequency limit is to be difined by the response of the low-pass filter. The lower frequency limit depends on its own natural frequency. Use in the frequency range lower such frequency is possible by damping the peak of the resonance.

Fixing Methods

Fixing angle

The table below shows the fixing angle of sensor whose natural frequency is 14 Hz or 4.5 Hz.

Fixing direction

Both (a) and (b) are available for the sensor whose natural frequency is 14 Hz, but the sensor whose natural frequency is 4.5 Hz is limited to any one of the (a) or (b). Can not be fixed downwardly. Special fixture is needed to fix upwardly.