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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 0~10KHz;(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 1 Clipping 0～5VDC output (±12VDC～±15VDC power supply)
0 2 Clipping 0～10VDC output (±15VDC power supply mode)
0 3 Unlimited negative voltage output -2 to -18VDC (-22VDC to -27VDC power supply mode)
0 4 Unlimited negative voltage output -4～-20VDC(-23VDC～-27VDC power supply mode)
0 5 Limiter ±5VDC output (±12VDC to ±15VDC power supply)
0 6 Clipping 4～20mA Output (±15VDC Power Supply Mode)
0 7 Limiter ±10VDC output (±15VDC power supply mode)
0 8 Clipping 0～10mA output (±15VDC power supply mode)
0 9 Unlimited positive voltage +2～+18VDC output (+22VDC～+27VDC power supply mode)
1 0 Limiter 4～20mA output (+24VDC±10% power supply mode)
1 1 Limit 1～5VDC output (±12VDC～±15VDC power supply mode)
1 2 Unlimited negative negative voltage output -2 to -20VDC (-22VDC to -27VDC power supply mode)
1 3 Limiter 4～20mA Output (±18VDC Power Supply Mode)
Probe diameter (mm)
Linear range (mm)
Linear range
(mm)
Sensitivity
(V/ mm)
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 Ï„, 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(Ï„, ξ, б,  D,  I, ω). Generally, we can control the parameters Ï„, 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:
â— Wear and Failure of Thrust Bearings â— Wear and Failure of Balanced Pistons
â— Looseness of the thrust flange â— 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 “lockedâ€
·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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Smart Speed ​​Meter SQSC-485A
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HZS-04N smart tachometer
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HZS-04C smart tachometer
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DF9000 Series Programmable Monitor Shaft Vibration Monitor DF9062
Rotary Machinery Eccentricity Monitor DF9042
Rotary speed monitor DF9012
Rotary speed monitor DF9015
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CWY-DO-810301 Eddy Current Displacement Sensor Eddy Current Velocity Sensor DF3011
Intelligent Speed ​​Monitor DF9011
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Vibration Monitor
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SWZQ-3A fan monitoring alarm
JM-B-3Z Intelligent Vibration Monitoring Protection Device
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CZJ-B Vibration Monitoring Protector
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
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DYZ-L type vibration intensity monitor
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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
ST-3 vibration speed sensor
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
YD9200A series integrated vibration transmitter
ZHJ-402 integrated vibration temperature transmitter
ZHJ-201 Vibration Temperature Sensor
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)
Vibration transmitter ST-3
ST-2
SG-2
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ZD-02 type intensity vibration transmitter
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ZDI-01 shaft vibration transmitter
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YZ-DO axial displacement transmitter
CZY-01 speed 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
Calibration instrument series
SH-08 Eddy Current Sensor Debugger
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SLMCD-21T integrated vibration transmitter integrated vibration and temperature transmitter KL-ZDW86-60-A
Integrated vibration and temperature transmitter KL-ZDW86-40-A
HZD-L-A2-B2-C2-D2-E2 Vibration Intensity Monitoring Protector
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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CWY-DO eddy current sensor four-wire eddy current sensor DWQZ
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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
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TD-2 thermal expansion displacement sensor
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HUT-81 tank level transmitter, HZD-Z-7 shaft vibration transmitter (with contact output). HZS-04-9 type speed transmitter HZD-B-5 integrated vibration transmitter HZD-B-5-T integrated explosion-proof vibration transmitter; HZD-Z-9 integrated shaft vibration transmitter; HZD-B-4 integrated vibration transmitter,  HZD-BI vibration change Sender.
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JM-X-23 integrated axial displacement transmitter. JM-X-13 integrated expansion differential transmitter JM-X-7 series stroke transmitter. ZHJ-2 vibration speed sensor
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JL-70 Integrated Eddy Current Sensor TD-2 and UT-81 Series Travel Sensor CS-1 Series Speed ​​Sensor
ZHJ-402 vibration temperature sensor. ZHJ-201 vibration temperature sensor
QBJ-3C speed monitoring protection instrument. QBJ-3C2 intelligent speed protection instrument
QBJ-3C/Q speed monitoring protection instrument. QBJ-3C2-DO speed monitoring protection instrument QBJ-3WZ crisis protection device. QBJ-31ZW axial displacement monitoring protection instrument QBJ-31Z differential expansion monitoring protection instrument. QBJ-3XRN thermal expansion Monitoring protection instrument QBJ-3XYN oil motive monitoring protection instrument. QBJ-3XN mailbox oil level monitoring protection instrument QBJ-3PN eccentric protection instrument. QBJ-3Q digital display instrument. SDJ-3N vibration monitoring protection instrument SDJ-3NA vibration monitoring protection instrument QBJ -3800XL Eddy Current Sensor. SDJ-3B/3lz Vibration Monitoring Protection Device. SDJ-3BS/SLS Vibration Monitoring Protection Device. SDJ-101 Vibration Transmitter Protection Device SDJ-302 Axis Position Protection Monitor. SDJ-501 Single Channel Speed ​​Monitoring Protection instrument SDJ-501J Key phase transmitter. SDJ-9B vibration transmitter. SDJ-9L vibration transmitter SDJ-701 vibration transmitter. SDJ-703 vibration transmitter. SDJ-705 vibration transmitter SDJ -706 Vibration Transducer Transmitter. ZH2012 Programmable Dual Channel Vibration Monitor (Amplitude, Intensity General); YZHB Intrinsically Safe Integrated Vibration Transmitter. RDCZ Series (Intelligent) Differential Expansion Monitor RDXZ Series Shaft Vibration Monitors .RDXZ -2 Series Shaft Vibration Monitors RDXZ-2G Series Shaft Vibration Monitors .CZJ-B3 Series Vibration Monitors CZJ-B3G Vibration Monitor Series.SZC-04 Series Smart Speed ​​Meter SZC-04B Smart Speed ​​Meter SZC-04BG Smart Speed ​​Meter SZC-04F Reverse Speed ​​Meter SZC-04F1 Reverse Speed ​​Meter SZC-04FG Wall Mount Reverse Speed ​​Meter XJZC-03A Speed ​​/ Impactor monitoring device XJTM-02 Display Alarm CZ-6C Digital Vibration Meter (Vibrometer) DZC-02A Tachometer ZH31186 Piezoelectric Acceleration Sensor SZCB-01 Reluctance Speed ​​Sensor SZCB-02 Magnetoresistive Speed ​​sensor SZCB-03 Reluctance speed sensor TDZ-1 Position sensor; TDM-1/TD-1 valve position sensor; TDM-2/TD-2 thermal expansion sensor; TDM/UT-81 tank fuel level sensor ZH1011A series vibration (intensity) Transmitter; & ZH1021A series axis vibration change JM-B-3E dual-channel vibration monitoring protection instrument. JM-B-7 intelligent vibration protection and protection instrument JM-B-201 intelligent vibration temperature detector. JM-B-4 Vibration temperature monitoring protection instrument JM-B-3Z intelligent vibration monitoring protection instrument. JM-B-6Z (402) monitoring protection device JM-B-5S vibration monitoring protection instrument. JM-X-3 series intelligent trip protection protection instrument JM- X-3W intelligent axial displacement monitoring protection device. JM-X-3Z intelligent expansion monitoring protection device JM-X-3 series intelligent trip protection protection device. J MC-3 series intelligent speed monitoring protection instrument JM-C-7F wall-mounted anti-speed monitoring protection instrument. JM-C-5S speed monitoring protection instrument JM-C-3 series of intelligent speed monitoring protection instrument. JM-C-6C three Take two speed monitoring protection instrument JM-B-3BC vibration transmitter. JM-B-3B2 watt vibration transmitter
JM-B-35 Integrated Wafer Transmitter.JM-B-33 Integrated Shaft Vibration Transmitter JM-B-37 Vibration Switch.JM-B-36 Vibration Transmitter HZS-90 Intelligent Temperature Digital Display Instrument. HZS-04T-S wall type intelligent anti-wall vibration intensity monitor, XZD-L type vibration intensity monitor, XZD-4 four-channel vibration monitor, XZW-D type axial displacement, differential expansion monitoring Instrument, XZS-04 Intelligent Speed ​​Monitor, XZD-Z Shaft Vibration Monitor, XCW-R Thermal Expansion Tester, XCW-U Tank Fuel Level Monitor, XCW-Y Oil Drive Travel Monitor, XZD- W-type vibration monitor WB8100E rotating machinery monitoring instrument, WB8600EH hydro-generator unit condition monitoring instrument, WB8800E rotating machinery monitoring system, WB8501C digital explicit axial displacement monitor, WB-8381GE intelligent speed monitor, MLI-2001 dual-channel vibration Monitor, XSM Series Tachometer, WB8521C Digitally Displayed Relative Expansion Monitor, WB-8531C Digitally Displayed Thermal Expansion Monitor, WB-8112B Digital Displayed Dual Channel Vibration Monitor JM-B-6Z Monitoring Protection Device, JM-B -6000 Steam turbine monitoring and protection device, JM-B-3E dual-channel vibration monitoring and protection device, JM-B-7 intelligent vibration monitoring and protection Instrument, JM-B-201 Intelligent Vibration Temperature Detector, JM-B-4 Vibration Temperature Monitoring Protector, JM-B-3Z Intelligent Vibration Monitoring Protector, JM-B-6Z (402) Monitoring Protection Device, JM-B -5S Vibration Monitoring and Protection Device, JM-X-3 Series Intelligent Travel Protection Device, JM-X-3W Intelligent Axial Displacement Monitoring Protection Device, JM-X-3Z Intelligent Differential Expansion Protection Device, JM-C-3 Series Intelligent speed monitoring protection instrument, JM-C-7F wall-mounted anti-speed monitoring protection instrument, JM-C-5S speed monitoring protection instrument, JM-C-6C three take two overspeed monitoring protection device 8000/B/C/E series Combined monitoring and protection device, RDZW series axial displacement monitor, RDCZ series expansion monitor, RDXZ series
Sensor CWY-D0-20Q25-50V,CWY-D0-20T25-M30×2-
Eddy Current Displacement Probe Sensor Preamplifier CWY-D0-20Q25-50V,CWY-D0-20T25-M30×2-B-00-05-50K