Low price eddy current sensor is used for linear displacement and vibration measurement. Measuring range 1mm, probe diameter 5mm, optional output signal 0～5V/ 0～10V/ 4～20mA/ RS485, max working current 45mA. The eddy current transducer is a non-contact inductive sensor, directly sold by manufacturer.

Applications: By measuring the relative position of the measured metal object and the probe end, eddy current displacement sensor senses and processes it into corresponding electrical signal output. Eddy current displacement transducer adopts non-contact measurement, which can work reliably for a long time, has high sensitivity, strong anti-interference ability, fast response speed, and is not affected by media such as oil and water. Eddy current displacement sensors are widely used in long-term real-time monitoring of shaft displacement, shaft vibration, shaft speed and other specifications of large rotating machinery, and are extended to satellite launch, material identification, weighing measurement, metal plate thickness measurement, material deformation and other application fields.

Specification

Eddy Current Action Principle Diagram (Unit: mm)

 Eddy Current Displacement Sensor Probe Structure & Dimension Diagram (Unit: mm)

Note: The shell of the eddy current displacement sensor probe is used to connect and fix the probe head, and is used as a clamping structure when installing the probe. In order to adapt to different applications and mounting occasions, the probe shell has different types and different threads and size specifications.

Eddy Current Displacement Sensor Proximitor Shell Dimension Diagram (Unit: mm)

The proximitor is the signal processing center of the entire eddy current sensor system. On the one hand, the proximitor provides high-frequency AC excitation current for the probe coil to make the probe work. On the other hand, through a special circuit, the proximitor senses the change in the gap between the probe head and the metal conductor. After being processed by the proximitor, a voltage or current output signal that changes with the linear change of the gap is generated.

Details

Tips：Eddy current displacement sensor working principle.

Working principle of the eddy current displacement sensor is the eddy current effect, which is an inductive measurement. Eddy current effect originates from the energy of the oscillating circuit. Eddy current needs to be formed in a conductive material. By introducing an alternating current into the coil in sensor probe, a magnetic field can be formed around the probe coil.

According to Faraday's law of electromagnetic induction, if a conductor is placed in this magnetic field, eddy currents will be excited in the conductor.

According to Lenz's law, the magnetic field direction of eddy current is exactly opposite to the magnetic field of coil, which will change the impedance value of the coil in probe. The change in impedance value is directly related to the distance between the coil and the measured object. After the displacement sensor probe is connected to controller, the controller can obtain the change in voltage value from the sensor probe, and use this as a basis to calculate the corresponding displacement value. Eddy current measurement principle can measure all conductive materials.

Since the eddy current can penetrate the insulator, even the metal material with the surface covered with the insulator can also be used as the measured object of an eddy current displacement sensor.