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徐州Eddy Current Linear Displacement Sensor ML33 (Circular form probe structure)

  • Product classification:Eddy Current Displacement Sensor
  • Number of views:1106
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  • Release time:2023-11-14
  • Overview

Working principle:

The working principle of eddy current sensor system is eddy current effect, which belongs to an inductive measurement principle. The eddy current effect results from the energy of the oscillating circuit. Eddy currents need to be formed in conductive materials. An alternating current is introduced into the inner coil of the sensor probe to create a magnetic field around the probe coil. If you put a conductor in this field, according to Faraday's law of electromagnetic induction, eddy currents will be excited within the conductor. According to Lenz's law, the direction of the eddy current's magnetic field is opposite to the coil's magnetic field, and this will change the impedance value of the coil inside the probe. The change in this impedance value is directly related to the distance between the coil and the object being measured. After the sensor probe is connected to the controller, the controller can obtain the variation of voltage value from the sensor probe and calculate the corresponding distance value based on it. The principle of eddy current measurement can measure all conductive materials. Because the eddy current can penetrate the insulator, even if the surface is covered with the metal material of the insulator, it can also be used as the object of the eddy current sensor. The unique coil winding design can not only realize the compact shape of the sensor, but also meet the requirements of its operation in the high temperature measurement environment.

Scope of Application:

By measuring the relative position of the metal measured body and the probe end, the eddy current displacement sensor induces and processes the corresponding electrical signal output. Sensor can work reliably for a long time, high sensitivity, strong anti-interference ability, non-contact measurement, fast response speed is not affected by oil and water and other media, in large rotating machinery axis displacement, axis vibration, axis speed and other parameters of the long-term real-time monitoring is widely used. And has been extended to satellite launch, material identification, weighing measurement, metal plate thickness measurement, material shape variables and other applications.


Technical parameter

measuring range

1mm

2mm

4mm

5mm

12.5mm

20mm

25mm

50mm

Probe Diameter(standard type)

Φ6mm

Φ8mm

Φ11mm

Φ17mm

Φ30mm

Φ40mm

Φ50mm

Φ60mm

Probe diameter
(countersunk head)

Φ8mm

Φ8mm

Φ11mm

Φ17mm

/

/

/

/

Probe diameter
(square form)

Φ8mm

Φ8mm

Φ13mm

Φ19mm

/

/

/

/

Probe diameter
(circular form)

/

/

/

/

Φ30mm

Φ40mm

Φ50mm

Φ60mm

Linearity (%FS)

≤±0.25

≤±0.25

≤±0.5

≤±0.5

≤±1

≤±1

≤±1

≤±2

Repeatability

0.5um

0.5um

1um

1um

2um

2~4um

2~4um

2~5um

Frequency Response (-3dB)

0~10KHz

0~8KHz

0~2KHz

0~1KHz

Output Signal

0~5V,0~10V,4~20mA,RS485

Power Supply

Voltage type:+9~36VDC or ±15VDC can option

Power Supply

Current type:+22~30VDC,RS485 +12VDC

Working Current

Voltage type<45mA,Current type<25mA,RS485<40mA

Ripple Wave

≤20mV

Temperature Drift

According to the output signal and the corresponding range and other factors

Static Sensitivity

According to the output signal and the corresponding range

Output Load

Voltage Output:Load capacity<10KΩ,Current Output:Load capacity<500Ω

Calibration Temperature

(20±5)℃

Working Temperature

Probe:-30℃~+110℃     Converter:-30℃~+85℃

Protection

Probe: IP67           Converter: IP65

Probe Cable Length

Standard 2m,(customized)

Power Cable Length

Standard 2m,(customized)


Connection definition


Current type

Voltage type

RS485

Brown

power positive   +24VDC

power positive  +12VDCor+24VDC

power positive  +12VDC

Black

Empty

power negative  0V

power negative  0V

Blue

Current output  OUT

output positive  OUT+ 

RS485   A+

White

Empty

output negative  OUT-

RS485   B-

Shielded wire

Grounding    GND

Grounding  GND

Grounding  GND

Product size


The ML33 sensor system consists of a probe, preprocessor, cable, and accessories.


1、Eddy current sensor probe

Standard probe installation size:

 

Usually the probe consists of a coil, a head, a shell, a high-frequency cable and a high-frequency connector.

In the production process, the head body of the probe is generally made of high temperature resistant PPS engineering plastics, and the coil is sealed by "secondary injection molding". The probe can work reliably in harsh environment. Because the diameter of the head coil determines the linear range of the sensor system, we usually use the external diameter of the head body to classify and characterize each type of probe. In general, the linear range of the sensor system is roughly 1/2 ~ 1/4 times of the diameter of the probe head. The sensor probe of ML33 series is shown in the figure (standard type) :

 

Measuring range  

Probe diameter

Probe length

Shell length

Installation type

Thread specification

1mm

Φ6mm

5mm

30mm

Standard

M8X1.0

2mm

Φ8mm

7mm

30mm

Standard

M9X1.0

4mm

Φ11mm

8mm

50mm

Standard

M14X1.5

5mm

Φ17mm

11mm

50mm

Standard

M18X1.0

12.5mm

Φ30mm

26mm

40mm

Reverse setting

M14X1.5

20mm

Φ40mm

33mm

40mm

Reverse setting

M14X1.5

25mm

Φ50mm

42mm

50mm

Reverse setting

M18X1.5

50mm

Φ60mm

47mm

50mm

Reverse setting

M18X1.5

 

 

 

The probe housing is used to connect and secure the probe head and is used as a clamping structure for the probe installation. The shell is usually made of brass nickel-plated process, engraved with standard threads and equipped with lock nuts. In order to adapt to different applications and installation occasions, the probe housing has different forms and different threads and dimensions.

 

Mounting size of countersunk probe:

 

Installation size of square probe:

 

Round probe mounting size:

 

Eddy current sensor preprocessor


The preprocessor is the signal processing center of the whole sensor system. On the one hand, the preprocessor provides high frequency AC excitation current to the probe coil to make the probe work; On the other hand, the preprocessor induces the gap change between the probe head body and the metal conductor in front of the head body through a special circuit. After processing by the preprocessor, the voltage or current output signal changes with the linear change of the gap.

 

Outline size of ML33 series preprocessor:

 

Product naming rules

1、Probe

 

●  A □□:Probe range code selection

 

▼   Probe code classification 

 电涡流量程范围.png

 

●  B□□ :No thread length option

  The threaded part of the probe is to facilitate installation, reduce invalid thread length, and make screwing bolts faster

  

▼Metric threaded probe

电涡流量程范围1.png

●  C□□ :Shell length option

  The length of the probe shell depends on the usage of the field. In order to ensure the measurement accuracy and avoid
the measurement interference from the vibration band of the probe rod, it is recommended not to use the length of the shell
over 300mm long; when necessary, an installation attachment to enhance the strength of the probe rod should be added

  

▼Metric shell length
电涡流量程范围2.png

● D□□ : Probe shape and structure selection

  This does not represent the standard probe structure; C represents the sink structure; F represents the square probe structure and Y represents the circular probe structure.



  • Application