ZH3000 series eddy current displacement sensor
Mainly used in electric power, petroleum, chemical industry, metallurgy, scientific research and other industries. It can be used for radial vibration, axial displacement, key phasers, shafts of large rotary mechanical shafts such as steam turbines, water turbines, blowers, compressors, gear boxes, and cooling pumps. Rotary speed, differential expansion, eccentricity, and rotor dynamics studies and part size inspections are performed online.
System characteristics
With a metal-encapsulated preamp, it has a strong anti-jamming capability. Even if it is installed in a non-metallic protective cover, nearby radio signals will not affect the sensor signal, thereby increasing the reliability, reducing the tedious protective installation measures, and reducing the production cost;
The reliable principle design has fault-tolerant protection. Within the rated voltage range, connecting the wrong line will not cause damage to the front device;
It has the ability to prevent lightning strikes, suppress power grid spikes, and has a low output noise figure.
The head body of the probe is selected from the latest imported PPS engineering plastic mold, with high strength, high temperature resistance 150 °C, anti-corrosion;
The connection between the probe and the prosthesis adopts the military high-temperature coaxial cable, and the long-term work will not be damaged in the environment of -40°C~150°C;
All the cables are exchanged with military standard connectors and have self-locking function;
Armoured with imported high elastic stainless steel, with high temperature resistant FEP skin.
It is a non-contact linear measurement tool. It is capable of long-term continuous operation, good reliability, wide measuring range, high sensitivity, high resolution, fast response, strong anti-interference ability, and free from the influence of oil and other media, so it can be used for on-line condition monitoring and fault diagnosis of large rotating machinery. Widely used in 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 · Bending caused by 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.
Mainly used in electric power, petroleum, chemical industry, metallurgy, scientific research and other industries. It can be used for radial vibration, axial displacement, key phasers, shafts of large rotary mechanical shafts such as steam turbines, water turbines, blowers, compressors, gear boxes, and cooling pumps. Rotary speed, differential expansion, eccentricity, and rotor dynamics studies and part size inspections are performed online.
System characteristics
With a metal-encapsulated preamp, it has a strong anti-jamming capability. Even if it is installed in a non-metallic protective cover, nearby radio signals will not affect the sensor signal, thereby increasing the reliability, reducing the tedious protective installation measures, and reducing the production cost;
The reliable principle design has fault-tolerant protection. Within the rated voltage range, connecting the wrong line will not cause damage to the front device;
It has the ability to prevent lightning strikes, suppress power grid spikes, and has a low output noise figure.
The head body of the probe is selected from the latest imported PPS engineering plastic mold, with high strength, high temperature resistance 150 °C, anti-corrosion;
The connection between the probe and the prosthesis adopts the military high-temperature coaxial cable, and the long-term work will not be damaged in the environment of -40°C~150°C;
All the cables are exchanged with military standard connectors and have self-locking function;
Armoured with imported high elastic stainless steel, with high temperature resistant FEP skin.
It is a non-contact linear measurement tool. It is capable of long-term continuous operation, good reliability, wide measuring range, high sensitivity, high resolution, fast response, strong anti-interference ability, and free from the influence of oil and other media, so it can be used for on-line condition monitoring and fault diagnosis of large rotating machinery. Widely used in 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 · Bending caused by 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.
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