Eddy Current Displacement Probe Sensor Preamplifier CWY-D0-20Q25-50V,CWY-D0-20T25-M30×2-B-00-05-50K

The sensor can measure the relative position of the test object (metal conductor) and the end face of the probe. Because of its long-term work reliability, high temperature resistance, high sensitivity, strong anti-interference ability, non-contact measurement, fast response, detection from oil, steam and other media, it is often used for large rotating machinery The long-term and real-time monitoring of parameters such as displacement, differential expansion, shaft vibration and shaft speed can analyze the equipment's working conditions and early warning of failures, effectively protect the equipment and perform predictive maintenance.
Non-contact displacement sensor based on high frequency eddy current effect. The high-frequency oscillating current generated in the front-end device flows into the probe coil through the coaxial cable, and the coil will generate a high-frequency electromagnetic field. When the measured metal body is close to the coil, an induced current is generated on the metal surface due to the effect of the high-frequency electromagnetic field, and the current is eddy current. This current produces an alternating magnetic field, the direction of which is opposite to that of the coil's magnetic field. The superimposition of these two magnetic fields alters the impedance of the primary coil. Therefore, the change of the distance between the probe and the surface of the measured metal body can be measured by the change of the impedance of the probe coil. The preamplifier outputs a DC voltage that is proportional to the distance based on the change in the impedance of the probe coil.
specifications:
Probes, extension cables at -20°C to 150°C, preamplifiers at -20°C to +85°C, and 95% relative humidity. At room temperature 22 °C, the measured material is AISI4140 (42CrMoA steel), power supply -24VDC (power supply output current is not less than 50mA, ripple is less than 10mV), the load is 10KΩ, the system meets:
For every 1V of supply voltage, the output change is less than 1.8mV.
The front device power consumption is less than 12mA.
The output impedance is not more than 10 ohms, the maximum output current is 50mA (the output mode is constant current), and the maximum drive signal cable length is 300m.
Frequency response DC&nbsp0~10KHz;(For Ф3, Ф5, Ф8, Ф10, tested under 0~-3dB, 300 meters wiring conditions)
Linearity error ±1% (including interchangeable error, φ3mm, φ4mm, φ5mm, φ8mm, φ10mm, φ11mm, φ14mm probe specifications)
Probe: Operating temperature -50 ~ +175 °C Temperature drift ≤ 0.05% / °C
Front device: Operating temperature -50～ +120°C Temperature drift ≤0.05%/°C
Interchangeability: error ≤ 5%
Frequency response: 0 ~ 10kHz; amplitude frequency characteristics - 1 kHz -1%, 10kHz -5%; phase frequency characteristics of 1kHz -1 °, 10kHz at -100 °
Output characteristics:
1. Negative voltage output Power supply: -18Vdc ~ -24Vdc Power consumption ≤ 12mA (without output current)
2, 4 ~ 20mA current output Power supply: +18Vdc ~ +30Vdc power consumption ≤ 12mA (excluding output current)
Sensor output method:
0&nbsp1 Clipping 0～5VDC output (±12VDC～±15VDC power supply)
0&nbsp2 Clipping 0～10VDC output (±15VDC power supply mode)
0&nbsp3 Unlimited negative voltage output -2 to -18VDC (-22VDC to -27VDC power supply mode)
0&nbsp4 Unlimited negative voltage output -4～-20VDC(-23VDC～-27VDC power supply mode)
0&nbsp5 Limiter ±5VDC output (±12VDC to ±15VDC power supply)
0&nbsp6 Clipping 4～20mA Output (±15VDC Power Supply Mode)
0&nbsp7 Limiter ±10VDC output (±15VDC power supply mode)
0&nbsp8 Clipping 0～10mA output (±15VDC power supply mode)
0&nbsp9 Unlimited positive voltage +2～+18VDC output (+22VDC～+27VDC power supply mode)
1&nbsp0 Limiter 4～20mA output (+24VDC±10% power supply mode)
1&nbsp1 Limit 1～5VDC output (±12VDC～±15VDC power supply mode)
1&nbsp2 Unlimited negative negative voltage output -2 to -20VDC (-22VDC to -27VDC power supply mode)
1&nbsp3 Limiter 4～20mA Output (±18VDC Power Supply Mode)
Probe diameter (mm)

Linear range (mm)
Linear range
(mm)
Sensitivity
(V/&nbspmm)
Non-linearity error Minimum measured shaft diameter
(mm)
Ф5
2
0.25~2.25
8
1%
Ф15
Ф8
2
0.25~2.25
8
1%
Ф20
Ф11
4
1.0~5.0
4
1.2%
Ф33
Ф25
12.5
1.25~13.75
1.28
2%
Ф55
Ф50
25
0.25~2.25
0.64
2%
Ф120
Non-contact displacement sensor based on high frequency eddy current effect. The high-frequency oscillating current generated in the front-end device flows into the probe coil through the coaxial cable, and the coil will generate a high-frequency electromagnetic field. When the metal body to be measured is close to the coil, an induced current is generated on the metal surface due to the effect of the high-frequency electromagnetic field, which is eddy current. This current produces an alternating magnetic field, the direction of which is opposite to that of the coil's magnetic field. The superimposition of these two magnetic fields alters the impedance of the primary coil. Therefore, the change of the distance between the probe and the surface of the measured metal body can be measured by the change of the impedance of the probe coil. The preamplifier outputs a DC voltage that is proportional to the distance based on the change in the impedance of the probe coil.
The front-end high-frequency oscillating current flows into the probe coil through the extension cable, and generates an alternating magnetic field in the coil of the probe head. If there is no metal material close within the effective range of this alternating magnetic field, this magnetic field energy will be totally lost; when the measured metal body is close to this magnetic field, an induced current will be generated on the metal surface, which is called electromagnetically. For eddy currents. At the same time, the eddy current field also produces an alternating magnetic field with a direction opposite to that of the head coil. Due to its reaction, the amplitude and phase of the high frequency current of the head coil are changed (effective impedance of the coil), and this change Metal magnetic permeability, conductivity, coil geometry, geometry, current frequency and head coil to metal conductor surface distance and other parameters. Assuming that the metal conductor is uniform in material and its performance is linear and isomorphic, the physical properties of the coil and metal conductor system can be determined from the conductivity σ of the metal conductor, the permeability ξ, the size factor τ, the head body coil and the surface of the metal conductor. Distance D, current intensity I, and frequency ω parameters are described. The characteristic impedance of the coil can be represented by the function Z=F(τ, ξ, б, &nbspD, &nbspI, ω). Generally, we can control the parameters τ, ξ, б, I and ω to be constant within a certain range. Then the characteristic impedance Z of the coil becomes a single-valued function of the distance D, although its entire function is nonlinear. The function is characterized by an "S" curve, but it can be chosen to be a segment that is approximately linear. Here, the change in the coil impedance Z, that is, the change in the distance D between the head body coil and the metal conductor is converted into a change in voltage or current by the processing of the driver electronics. The size of the output signal varies with the distance between the probe and the surface of the measured object. The eddy current sensor is based on this principle to measure the displacement and vibration of metal objects.
The working process is: When the distance between the metal under test and the probe changes, the Q value of the coil in the probe also changes, and the change of the Q value causes a change in the amplitude of the oscillating voltage, and this oscillating voltage over the distance is detected. , Filtering, linear compensation, and amplification normalization process are converted into voltage (current) changes, and finally mechanical displacement (gap) is converted into voltage (current). From the above, the measured body in an eddy current sensor working system can be regarded as one half of the sensor system, that is, the performance of an eddy current displacement sensor is related to the measured body.
Widely used in electric power, petroleum, chemical, metallurgical and other industries and some scientific research units. Radial vibration, axial displacement, key phaser, shaft speed, differential expansion, eccentricity, and rotor dynamics of large rotating machinery shafts such as steam turbines, turbines, blowers, compressors, air separation machines, gear boxes, and large cooling pumps Online measurement and protection such as part size inspection.
Axial displacement measurement
For many rotating machines, including steam turbines, gas turbines, water turbines, centrifugal and axial compressors, centrifugal pumps, etc., axial displacement is a very important signal. Excessive axial displacement will cause oversized mechanisms. damage. The measurement of axial displacement can indicate the axial clearance or relative instantaneous displacement change between the rotating part and the fixed part to prevent the destruction of the machine. Axial displacement refers to the machine's internal rotor in the axial direction relative to the clearance between the thrust bearings. Some mechanical faults can also be identified by axial displacement detection:
● Wear and Failure of Thrust Bearings ● Wear and Failure of Balanced Pistons
● Looseness of the thrust flange ● Locking of the coupling.
The measurement of axial displacement (axial clearance) is often confused with axial vibration. Axial vibration refers to the rapid change of the distance between the surface of the sensor probe and the measured body along the axial direction. This is the vibration of an axis and is represented by the peak-peak value. It has nothing to do with the average gap. Some faults can cause axial vibration. For example, the vibration and misalignment of the compressor are just right.
Vibration measurement
Measure the radial vibration, it can see the working state of the bearing, can also see the imbalance of the rotor, not the medium mechanical failure. It can provide the information needed for the mechanical condition monitoring of the following key or basic machinery:
·Industrial Turbines, Steam/Gas Compressors ·Compressors, Air/Special Purpose Gases, Radial/Axial
·Expanders ·Generating turbines, steam/gas/water conservancy
·Electric motor ·Generator
·Exciters ·Gearboxes
·Pumps ·Fans
·Blower ·Reciprocating machinery
Vibration measurements can also be used for continuous monitoring of general small machines. It can provide important information for early discrimination of various mechanical failures as follows.
·Synchronous shaft vibration ·Oil film instability
Rotor friction · Loose parts
Loose bearing sleeve Compressor vibration
· Rolling element bearing failure · Radial preload, internal/external including misalignment
· Bearing babbitt wear · Bearing clearance is too large, radial / axial
Balance (gas barrier) piston wear/failure • Coupling “locked”
·Axial bending ·Axial crack
·Electric motor air gap uneven ·Gear bite problem
Turbine Blade Channel Resonance
Eccentricity measurement
Eccentricity is the measurement of the degree of bending of the shaft at low speeds. This bending can be caused by the following conditions:
· The original mechanical bending · The bending caused by the temporary temperature rise · In the static state, there must be some downward bending, sometimes called gravity bending.
The measurement of eccentricity is very important for evaluating the overall mechanical state of a rotating machine. Especially for steam turbines equipped with TSI, eccentricity measurement has become an indispensable measurement item during startup or shutdown. It allows you to see the amplitude of shaft bending caused by heat or gravity. The eccentric position of the rotor, also called the radial position of the shaft, is often used to indicate the wear of the bearing and the size of the load. As in the case of misalignment, it is also used to determine the azimuth of the shaft. The azimuth can indicate whether the rotor is stable.
Differential pressure measurement
For turbine-generator units, the thermal expansion of the shaft may exceed the expansion of the housing due to different metallic materials, different thermal expansion coefficients, and differences in heat dissipation during start-up and shut-down; this may result in rotating components of the turbine and The mutual contact of the stationary parts (such as case, nozzle, pedestal, etc.) causes the destruction of the machine. Therefore, the measurement of differential expansion is very important.
Speed ​​measurement
For all rotating machinery, it is necessary to monitor the rotational speed of the rotating mechanical shaft, which is an important indicator to measure the normal operation of the machine. The superiority of the eddy current sensor in measuring the rotational speed is unmatched by any other sensor measurement. It can not only respond to zero speed, but also respond to high speed, and the anti-interference performance is also very strong.
Rolling bearings, motor commutator rectifiers dynamic monitoring
Predictive maintenance of machines using rolling bearings is important. The probe is mounted in the bearing housing so that the bearing outer ring can be observed. As the rolling element collides with the place where the bearing is defective when the bearing rotates, the outer ring will produce slight deformation. The monitoring system can monitor this deformation signal. When the signal is deformed, it means that a bearing failure has occurred, such as a crack defect of a rolling element or a defect of a bearing ring. It is also possible to measure the running state of the inner ring of the bearing and to measure the degree of bearing slippage after calculation. G-2 Vibration Sensor KR-939B Fan Safety Operation Monitor, KR-939B3 Fan Safety Monitor, KR-939B4 Fan Safety Monitor, KR-939B4-4 Equipment Safety Monitor, KR-32 Dual Channel Equipment safety monitor, KR-34 four-channel equipment safety monitor, KR-939NCS fan speed frequency meter VB-Z500B rotating machinery condition monitoring and protection table, VB-Z412 dual-channel shaft displacement/dilatation monitor, VB-Z410/ 410A axis displacement/differential expansion monitor, VB-Z430F dual-channel bearing vibration monitor, VB-Z430 dual-channel bearing vibration monitor VB-Z720 dual channel water-based swing monitor, VB-Z730 dual-channel water vibration monitor , VB-Z420 dual-channel vibration monitor, VB-Z470B wall-mounted positive/reverse monitor, VB-Z470 positive/reverse monitor, VB-Z440 speed monitor XZD-LG two-wire speed transmitter ZSBS- 2
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ZYCMT microcomputer speedometer
HY-3V Bearing Vibration Monitor Intelligent Speed ​​Digital Transmitter IC-3A
Smart Speed ​​Meter SQSC-485A
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SFSD-6 Digital Tachometer Tachometer SQSD-3
Tachometer SFSD-5
XJZC-03A/Q Intelligent Speed ​​Impactor Monitor Protection Device
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HZS-04-9 speed transmitter
HZS-04d Explosion-proof smart tachometer
HZS-04N smart tachometer
HZS-04-I speed transmitter
HZS-04C smart tachometer
HZS-04F Intelligent Reverse Tachometer
HZS-04L Intelligent Zero Tachometer


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ST-2FB vibration speed sensor
XJZC-03A speed-impacter monitoring device
JM-B-3Z-02-02-200 Intelligent Vibration Monitoring Protection Instrument Smart Tachometer HZS-04
Integrated vibration temperature transmitter VRT-2T
Positive and negative monitoring protection instrument VB-Z470B (S2184)
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CS-1-G-075-03-01 Speed ​​Probe
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VB-Z500B Rotating Machinery Condition Monitoring Protection Sheet
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VB-Z8901 vibration calibrator
HZD-BS vibration transmitter
HZD-B-5X integrated vibration transmitter
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VB-Z440 speed monitor
VB-Z470 Intelligent Reverse Speed ​​Monitor
XZD-YB integrated explosion-proof vibration transmitter



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Rotary Machinery Eccentricity Monitor DF9042
Rotary speed monitor DF9012
Rotary speed monitor DF9015
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Axial displacement monitor DF9002
CWY-DO-810301 Eddy Current Displacement Sensor Eddy Current Velocity Sensor DF3011
Intelligent Speed ​​Monitor DF9011
Thermal expansion monitor DF9032
Vibration Monitor
CD-21-T Vibration Speed ​​Sensor
CD Series Speed ​​Sensor CD21-C&nbspCD21-S
TS-V-211 Intelligent Vibration Temperature Monitor
HZS-04T-S wall-mounted intelligent anti-tachometer vibration intensity monitoring protection device (wall type)
SWZQ-3A fan monitoring alarm
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CZJ-B2/B3/B4 Intelligent Vibration Monitor Monitor
CZJ-B3 series vibration monitoring protector
MLI-2001 Dual Channel Vibration Monitor
HZD-W/LF Intelligent Vibration Monitor
CZJ-3N vibration monitoring protector
HZD-W/L four-channel vibration monitor
RDXZ-2/2N/2NA Shaft Vibration Monitor
UT312 vibrometer
CZJ-B series vibration monitoring protection instrument
DYZ-L type vibration intensity monitor
DYZ-Z vibration intensity monitoring integrated vibration transmitter series vibration digital display alarm KYSX-2000
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Three-parameter combination probe KR-939SB3
SDJ-101 displacement vibration protection transmitter
SDJ-301 axial displacement transmitter
VB-Z230, VB-Z230AN vibration transmitter Princeton PR-9200 chassis vibration transmitter
JK9301B01 Integrated Vibration Transmitter
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TD-9200A Integrated Vibration Transmitter
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KR-939SB3 type integrated three-parameter combination probe
KR-939SB4 type integrated four-parameter combination probe
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HZD-B-9F Vibration Transmitter
HZD-B-6 two-wire integrated vibration transmitter
HZD-B-I type vibration transmitter
HZD-BS vibration transmitter
HZD-Z-7 shaft vibration transmitter (with contact output)
HZD-B-9 vibration transmitter
HZD-B-5T Integral Explosion-proof Vibration Transmitter
HZD-B-8T/HZD-B-8B/vibration transmitter
HZD-B-4 integrated vibration transmitter
HZD-B-1 Vibration Transmitter
HZD-B-8 Integrated Vibration Transmitter
HZD-B-5 integrated vibration transmitter
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Vibration speed sensor HD-ST-2
HD-ST-3 vibration speed sensor
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JM-C-7F
JM-B-3Z/N
JM-C-3
JM-B-3Z vibration speed monitoring protector
JM-B-7 Intelligent Vibration Monitoring Protection Device (Dual Channel)
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ST-2
SG-2
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ZD-02 type intensity vibration transmitter
ZD-03 integrated explosion-proof vibration transmitter
ZD-03A integrated vibration transmitter
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ZDI-01 shaft vibration transmitter
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YZ-DO axial displacement transmitter
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CD-6, ST-3, ST-5 vibration speed sensor (vibration probe)
VS-2 Vibration Speed ​​Sensor (Magnetic Type)
ZHJ-6 type integrated vibration and temperature sensor
JM-B-3B, JM-B-33, JM-B-35
Vibration speed sensor ZHJ-2
ZHJ-3D low frequency vibration sensor
SZ-6 vibration sensor



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SH-08 Eddy Current Sensor Debugger
SH06 eddy current sensor calibrator cable fault tester vibration instrument series vibration temperature combination transmitter CP810-P
SLMCD-21T integrated vibration transmitter integrated vibration and temperature transmitter KL-ZDW86-60-A
Integrated vibration and temperature transmitter KL-ZDW86-40-A
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TRA-2X Smart Stroke Monitoring Protector Thermal Expansion Monitor ZT6501
Vibration Monitoring Protector SDJ-3B
Vibration Monitoring Protector HZD-D/S-2
SDJ-3BS, SDJ-3LS vibration monitoring protector
SDJ-6N vibration monitoring protection instrument (intelligent)
SDJ-6L Vibration Monitoring Protector
SDJ-3L Vibration Monitoring Protector -
CDX-2 Vibration Monitor
CDX-2A Vibration Intensity Monitor
ZDX-N Shaft Vibration Monitor
XDZW-2 Axial Displacement Monitoring Protector
XDZC-2 differential expansion monitor protector
YDJ-A type oil motive monitor
YDJ-Y Tank Oil Level Monitor Protection Device
YDJ-W thermal expansion monitor
ZS-B2 positive and negative speed monitoring protector
ZS-B1 Intelligent Speed ​​Monitor
8200 Series Rotary Machinery Monitoring and Protection Device
JM-B-35L
Dual-channel vibration monitor
ZHJ-2-01-02-10-01 Vibration Speed ​​Sensor
SDJ-9B/SDJ-9L Vibration Transmitter
SDJ-3B/G
SDJ-2N vibration monitoring protector
QBJ-6RSDC
SDJ-3N type vibration monitoring protector
JM-B-6Z (402) Protection Protector
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Sensor digital display sensor series
CRN-02 Magnetoresistive Sensor
VB-Z9100 series eddy current sensor
BSQ051 series speed transmitter
SZ-6 vibration sensor
CWY-DO eddy current sensor four-wire eddy current sensor DWQZ
DWQZ eddy current sensor static displacement calibrator bearing probe SDJ-SG-2F/SDJ-SG-2H
Vibration Speed ​​Sensor SDJ-SG-2W
WT-DO-A1-B1-C1-D1 Eddy Current Sensor
WT-DO-A1-B1-C2-D2 Eddy Current Sensor Eddy Current Sensor DWQZ
YZ-6 magnetoelectric vibration speed sensor
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CZX-01 Reluctance Speed ​​Sensor
YN-DO series axial displacement sensor
YH-DO series eddy current sensor integrated eddy current sensor Model:YH-DO-1
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TD-2 thermal expansion displacement sensor
TD series LVDT sensor
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WT-DO Series Probes, Eddy Current Sensors, Front Probes, Extension Cables
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