Home » News » Non-contact vibration eddy current sensors

Non-contact vibration eddy current sensors

Views: 0     Author: Site Editor     Publish Time: 2024-01-17      Origin: Site

Non-contact vibration eddy current sensors

CWY-DO series eddy current sensor introduction

The eddy current sensor is a non-contact measurement sensor that accurately measures the relative position of the measured body (which must be a metal conductor) to the end face of the probe, with the voltage signal output by the sensor being proportional to the distance between the end of the probe and the measured conductor. It is capable of both static (displacement) and dynamic (vibration) measurements. It is mainly used for the measurement of shaft displacement, shaft vibration, shaft speed and other parameters of rotating machinery, which can effectively monitor and protect the equipment.微信图片_20240112164730

Product characteristics

Good interchangeability

interchangeable probes of the same type

interchangeable extension cables of the same type

interchangeable preamps of the same type

(identical performance after interchange)


High reliability

probes are resistant to high temperatures and oil and corrosion

Special probe encapsulation technology

advanced production process

stringent factory inspection standards


Standards

conforms to EMC EN61000-6-2, EN61000-6-4

in accordance with API670



Customizable

Probe sizes are customizable

range support customization


Application Live View

640 (1)

640

640 (2)

Principle of sensor operation

图片1

The high frequency oscillation circuit in the preamplifier generates a high frequency signal which is sent through the cable to the coil at the end of the probe, generating an alternating magnetic field at the end of the probe, which generates an induced current (eddy current) on the metal surface when the measured metal body is close to this field. The amplitude and phase of the high-frequency current in the head coil is changed (the effective impedance Z of the coil is changed) due to its counteraction. The change in the coil impedance Z, i.e. the change in the distance D between the head coil and the metal conductor, is then transformed into a voltage or current output signal through the processing of the preamplifier's electrical conditioning circuit, thus enabling the measurement of displacement, vibration and other parameters.


Components of the sensor

Eddy current sensor consists of three parts: probe, extension cable and preamplifier.


Probe

The probe consists of a coil, protective cover, stainless steel housing, coaxial cable,high frequency connector, etc. Depending on the measuring range,different diameters of the probe can be selected, e.g. Φ5mm, Φ8mm, Φ11mm,Φ18mm, Φ25mm, and depending on the installation requirements,different mounting methods can be selected, e.g. front-mounted, reverse-mounted,non-threaded, and depending on the installation conditions, the length of the probe cable can be selected, e.g. 1m or 0.5m.

Depending on the installation conditions, the cable length can be selected, e.g. 1m or 0.5m.

微信图片_20240112170839

Preamplifier

The preamplifier is the core part of the system, which includes the oscillation,linearity detection, filtering, linearity compensation and amplification circuits of the entire sensor system. The VB-Z98 preamplifier is divided into Φ5mm, Φ8mm, Φ11mm, Φ18mm and Φ25mm according to the diameter of the probe to be used.

微信图片_20240112170834
Extension Cable

Both ends of the extension cable are equipped with SMA self-locking connectors with oil-proof heat-shrinkable sleeves to protect the connection between the self-locking plug and the cable from contamination by oily media and to increase system reliability. Extension cable lengths are available in 4m, 4.5m, 8m and 8.5m.

Note: Requires probe cable length + extension cable length = 5m or 9m.

微信图片_20240112170842

640 (3)640 (4)640 (5)

640 (6)

Sensor Composition Diagram

图片2


Application Schematic

Typical configuration for turbine monitoring

图片3

微信图片_20240112172519图片4

CWY-DO series eddy current sensor technical indicators


图层 1 图层 2 图层 3 图层 4 图层 5

System Abbreviation

φ5 system or 5mm system φ8 system or 8mm system φ11 system or 11mm system φ18 system or 18mm system φ25 system or 25mm system
Model CWY-DO-401

CWY-D0-402

CWY-D0-404

CWY-D0-410-18

CWY-D0-410-25

Measuring and Electrical Properties

Measurement Principle

                                                                    Measurement Principle

Calibrating Target Disc Materials

                                                                           45# Steel

Standard Range

1.5mm

2mm 4mm 10mm 10mm

Standard Measuring Range

0.25-1.75mm

0.5-2.5mm

1-5mm

0.5-10.5mm

1 -11 mm

Customisable Maximum Range

2mm

3mm 6mm 10mm 16mm

Standard Sensitivity

8mV/um

8mV/um

4mV/um

0.8mV/um

0.8mV/um

Sensitivity Error

≤±2%

                              ≤±3%

                              ≤±1%
Sensitivity interchangeability error

                                           ≤±5%

                              ≤±3%

Non-linearity

                                            <1%

                               <1.5%

Resolution

±1um

±1um

±2um

±10um

±10um

Frequency Response

                                  DC to 10kHz (-3dB)

DC to 3kHz(-3dB)

DC to 1kHz(-3dB)

Output Signal Range Corresponding to Range

-2 to -14V

-2 to -18V

-2 to -18V

-2 to -10V

-2 to -10V

Max. Output Voltage

                                                                        -23 V

Output Resistance


                                                                        100Ω

System Temperature Drift

                                                         ±3% F. S. (-20°C to +80°C)

Recommended Installation Voltage

                                               -10V                               -6V

Front-end Power Supply

                                                                        -24VDC±10%

Maximum Current Consumption

                                                                            ≤ -20mA

Probe Resistance

8.2±0.3Ω

4.9±0. 3Ω

6.5±0.3Ω

4.2±0. 2Ω

0. 9±0.3Ω

Protection Classes

Probe and Extension Cable Operating Temp.

                                                                       -40°C to +170°C

Front-loader Operating Temp.

                                                                        -40°C to +80°C

Probe Protection Classes

                                                                                 IP68

Front-loader Protection Classes

                                                                                 IP40

Electromagnetic Compatibility Specification

                                                                 EN61000-6-2, EN61000-6-4
Physical Properties

Probe Protection Cover Material

                                             PPS

                             PEEK

Probe Protection Cover Diameter

5.5mm

8.4mm

11.2mm

16.7mm

27.0mm

Probe Screw Material

                                                                    Stainless steel

Probe Screw Thread Specification/Customizable

M8 or M10

M10 M14 M18 M30

Probe Cables and Extension Cables

                                                              Three-core coaxial cable

Cable Length

                                     Probe cable + extension cable = 5m or 9m (Customisable )

Cable Sheathing Materials

                                                                         FEP
Min. Turning Radius of Cable                                                                         30mm

Front-loader Material

                                                   ADC12(Die-cast aluminium alloy)

Total System Weight

                                    500g±3%                       700g±3%

Remarks

1) Sensitivity interchangeability error refers to the interchangeability of any component for comparison with the standard sensitivity.

Preamplifier Selection and Size

Preamplifier Selection

1


Dimensions of the preamplifier housing and mounting tabs

9

Extension cable size and selection

Extension cable armouring

2


Normal Extension cable

3

Extension cable selection

4

5mm(Φ5)Probe diagram and selection

5mm(Φ5)Probe diagram

5

5mm(Φ5)Probe Selection

6

8mm(Φ8)Probe diagram and selection

8mm(Φ8)Probe diagram

8mm_02

8mm Reverse Probe diagram

8mm_04

8mm(Φ8)Probe Selection

8mm_06

11mm(Φ11)Probe diagram and selection

11mm(Φ11)Probe diagram

11mm_02

11mm(Φ11)Probe Selection

11mm_04

18mm(Φ18)Probe diagram and selection

18mm(Φ18)Probe diagram

18mm_02

18mm(Φ18)Probe Selection

18mm_04

25mm(Φ25)Probe diagram and selection

25mm(Φ25)Probe diagram

25mm_02

25mm(Φ25)Probe Selection

25mm_04

Mounting precautions for the subject and probe

7


P 1  d :When the measuring body is a disc, it does not affect the minimum target surface diameter to be measured.

P 2  A :Minimum distance of the mounting surface of the bracket from the end of the probe without affecting the measurement.

       B :Minimum spacing for slotting of brackets without affecting measurements.

P 3  C :The minimum distance between the probe and the side masking surface or from the edge does not affect the measurement when there is masking metal on the side of the body being measured or when there is an edge.

P 4  E :Double probes mounted parallel to each other with minimum spacing that does not affect the measurement.

P 5  F :Double probes are mounted vertically to measure the shaft body without affecting each other's minimum diameter.

P 6  G :Minimum distance between probes that do not interfere with each other's measurements when dual probes are mounted vertically to measure a block.

                                                                                                                                                                                           unit:mm


d A B C E F G

5mm probe(Φ5)

15.2 6 18 8 40.6 50 23

8mm probe(Φ8)

22 8 22 10 50 60 26

11mm probe(Φ11)

30 12 32 15 60 75 36

18mm probe(Φ18)

50 18 60 28 90 - -

25mm probe(Φ25)

75 31 92 40 152 - -

Yangzhou Xiyuan Electronic Technology Co.,Ltd.

Building 2,217 kaifa west road,high-tech development zone, yangzhou, jiangsu,China 225128

Mobie Phone: +86 180-5105-8377

Tel: +86 514-82885589

Whatsapp:+86 182-6066-6867

Email: sale1@yzxyt.com

Fax: +86 514-82885089


Product Inquiry

ABOUT

PRODUCTS

QUICK LINKS

CONTACT

Building 2,217 kaifa west road,high-tech development zone, yangzhou, jiangsu,China 225128
 +86-514-82885589
Copyrights 2022 Yangzhou Xiyuan Electronic Technology Co., LTD.  Sitemap / Support By Leadong