By measuring the relative position of the metal measured body and the probe end, the eddy current displacement sensor is induced and processed into the corresponding electric signal output.The eddy current sensor is a non-contact sensor, the sensor has high sensitivity, strong anti-interference ability, fast response speed, the effect of oil and water, can be long-term in bad working environment and reliable work. Is widely used for long-term real-time monitoring of parameters in the axial displacement, large rotating machinery shaft vibration, shaft speed etc..Eddy current sensor is also widely used in electric power, petroleum, chemical industry, metallurgy and other industries and scientific research units.For turbine, turbine, blower, compressor, air compressor, gear box, large cooling pumps and other large rotating machinery shaft radial vibration, axial displacement, key phase, shaft speed, differential expansion, eccentricity, and rotor dynamics and parts dimensional inspection, on-line measurement and protection. Also extended to the satellite launch, material identification, weighing measurement, metal plate thickness measurement, material shape variable and other application areas.

The ML eddy current sensor system mainly includes the probe, the front device and the accessories. The probe is composed of a coil, a head, a casing, a high frequency cable, and a high frequency joint.

The head of the probe is made of high temperature resistant, and the coil is sealed by the two injection molding. The probe can work reliably in harsh environments. The ML series sensor consists of Φ5、Φ8、Φ11，Φ18、Φ25、Φ50、Φ60 7 head diameters.

The probe shell is made of stainless steel, and is engraved with standard thread, and is provided with a locking nut. In order to be able to adapt to different applications and installations, the probe housing has different forms and different thread and size specifications.

Front controller is the signal processing center of the whole sensor system. On the one hand, the proximitor to provide high frequency AC coil excitation current of the probe; on the other hand, preamplifier circuit of induction by special clearance change probe head body and the head in front of the body of the metal conductor, after processing the proximitor, with occasional linear change of the output voltage or current signal. Lead to the requirements of the working environment is more stringent, usually it is installed in the location away from the danger zone, the surrounding environment should be no corrosive gas, dry, small vibration, ambient temperature and room temperature difference is not large.

Use matters needing attention:

1.The measurement results measured body surface finish is the degree of influence. The probe measured body surface is not smooth, in the measurement of actual application will bring additional errors, especially for vibration measurement, vibration signal superposition error signal and the actual, and it is difficult to separate in electric, so the measured surface should be smooth, there should be no scratches, holes, bulge or groove defects (for specially for the key phase detector, speed measurement settings of the boss or the groove except);

2.The sensor characteristics (here sensitivity) and measured the resistivity and permeability of. When the measured body for magnetic materials (such as ordinary steel, steel structure, etc.) due to the magnetic effect and eddy current effects exist at the same time, the sensitivity of the sensor is reduced; and when the measured object is non-magnetic or weakly magnetic materials (such as copper, aluminum, alloy steel, etc.), the sensitivity of the sensor to be high;

3.Residual magnetic effect on the surface of the measured body affects the measurement results. In the process of material processing, the formation of residual magnetic effect, as well as quenching is not uniform, uneven hardness, crystal structure is not uniform and so will affect the characteristics of the sensor;

4.The effect of surface coating on the measured body. Different coating materials, the sensitivity of the sensor will be different changes. If the coating is uniform and the thickness is greater than the depth of the eddy current. The sensor is re calibrated according to the coating material, and it is not affected by the use of the sensor.

henzhen miran Technology Co., Ltd is a high-tech enterprise approved by Shenzhen municipal government. Rich experience in sensor industry field for more than 15 years, the great brand products have been widely used in the world all kinds of automation control field, the direction of development is: to technological innovation as the core, to customer demand-oriented, will have been committed to the field of measurement and control in displacement, position and angle provides a station solutions to products and service for customers.

The main products are miran technology / resistive potentiometer displacement sensor principle (electronic scale), pull rope type displacement sensor (rope type electronic ruler), principle of magnetostrictive displacement sensor (contactless magnetic induction electronic ruler), principle of magnetostrictive liquid level sensor (liquid level measurement and control system), differential displacement sensor, LVDT eddy current displacement sensor, angle sensor (angle ruler), transmission module, digital display instrument and intermittent automatic lubricating oil pump etc.. All products have achieved CE, 3C certification, and access to ISO9001:2008 international quality system certification, in strict accordance with the international quality certification standards organization design and production, to ensure product quality.