Ⅰ、Overview of MTW Magnetic Levitation Magnetostrictive Displacement Sensor
In ferromagnetic materials, a change in the direction of magnetization will cause a change in the lattice spacing of the medium, thereby altering the length and volume of the ferromagnetic material, which is known as the magnetostrictive phenomenon, also called the Widman effect, and its reverse effect is called the Villari effect.
The principle of magnetostrictive displacement sensors is to generate a strain pulse signal when two different magnetic fields intersect, and then calculate the time period required for this signal to be detected, thereby converting it into an accurate position. These two magnetic fields, one from the permanent magnet in the magnetic ring and the other from the excitation pulses generated by the electronic components in the sensor's electronic housing. The excitation pulse travels at the speed of sound along the waveguide wire made of magnetostrictive material inside the sensor. When intersecting with the permanent magnetic field in the magnetic ring, due to the magnetostrictive phenomenon, the mechanical vibration generated by the waveguide wire forms a strain pulse. The strain pulse was quickly detected by the sensing circuit in the electronic compartment. From the moment the excitation pulse is generated to the total time when the strain pulse is detected, multiplied by a fixed speed of sound, we can accurately calculate the position change of the magnet. This process is continuous, so whenever the position of the magnetic ring changes, the new position will be measured quickly. Since the output signal is a true position value rather than a proportional or signal that requires further amplification processing, there is no signal drift or value change, and it is not necessary to recalibrate regularly like other sensors.
The magnetostrictive sensor is non-contact and never wears out. It features high resolution, high precision, high stability, high reliability, fast response time and long working life. The sensor does not need to be recalibrated or maintained regularly.
Ⅱ、Technical parameters of MTW magnetic levitation magnetostrictive displacement sensor
| Model | MTW Magnetic Suspension Series Magnetostrictive Displacement Sensor | Resolution | ≤0.01mm |
| Effective Stroke | 50mm-1500mm | Non-linearity Error | ≤±0.05%FS |
| Repeatability | ≤±0.005%FS | Supply Voltage | DC24V |
| Hysteresis | ≤0.001%FS | Temperature Stability | ≤0.002%/℃ |
| Output Signal | 4-20mA, 0-20mA, 0-5V, 0-10V, RS485 (MODBUS-RTU) | ||
| Cable Connection | Waterproof cable gland | ||
| Operating Current | <60mA (varies with stroke length) | ||
| Load Capacity | Voltage output load ≥4KΩ, Current output load ≤500Ω | ||
| Operating Temperature | -40℃～85℃ | Protection Rating | IP67 |
| Reverse Polarity Protection | Max. -30VDC | Overvoltage Protection | Max. 36VDC |
| Insulation Resistance | >10MΩ | Insulation Strength | 500V |
Ⅲ、Wiring method of MTW magnetic levitation magnetostrictive displacement sensor
Before wiring, please check whether the power supply meets the requirement of +24VDC, and the output power of the power supply must be greater than the total power consumption of the product, calculated based on ≤60mA for each sensor with different ranges. If the power supply does not meet the requirements, please replace the power supply to ensure that the sensor can work normally.
Wiring method for analog signal output
Ⅳ、Waterproof connector direct output wiring method:
The sensor has five contacts: positive power supply (brown), negative power supply (black), positive signal output (blue), negative signal output (white), and ground of the housing (shielded wire).
Digital signal output wiring method
Ⅴ、Waterproof connector wiring method (RS485 (MODBUS-RTU) signal output) :
The sensor has five contacts: positive power supply (brown), power ground (black), RS485A(blue), RS485B (white), and housing ground (shielded wire).
Ⅵ、Installation dimensions of MTW magnetic levitation magnetostrictive displacement sensor
Ⅶ、Application fields
Servo hydraulic cylinder piston position preset and feedback, servo cylinder piston position preset and feedback, grinding machinery position preset and feedback, casting and forging machine tool position preset and feedback, other machinery such as gantry machine tool position preset and feedback, tunnel boring machine, shield machine, coal mining machinery cylinder position preset and feedback, engineering hoisting machinery cylinder position preset and feedback Presetting and feedback of cylinder positions for steel rolling mills and other steel plant machinery, presetting and feedback of cylinder positions for bottle blowing machinery, presetting and feedback of cylinder positions for injection molding machinery, regulation of railways and Bridges, detection of water levels and control of water gates, presetting and feedback of position for wood machinery, presetting and feedback of cylinder liquid levels, presetting and feedback of liquid levels for chemical containers, drinking water and sewage treatment systems Geodetic system, position presetting and feedback of gate opening, measurement of cylinder liquid level.