legrand switch German legrand model legrand price

legrand switch, which precisely detects the absolute position of a movable magnetic ring through internal non-contact measurement and control technology to measure the actual displacement value of the detected product; the high precision and high reliability of this switch have been widely applied in thousands of practical cases. Since the movable magnetic ring used for position determination and the sensitive element do not come into direct contact, the switch can be used in extremely harsh industrial environments and is not easily affected by oil stains, solutions, dust, or other contaminants. In addition, the switch uses high-tech materials and advanced electronic processing technology, so it can be used in environments with high temperature, high pressure, and high oscillation. The switch output signal is the absolute displacement value; even if the power is interrupted and reconnected, data will not be lost, and there is no need to re-zero. Since the sensitive element is non-contact, even with continuous repeated detection, no wear will be caused to the switch, which can greatly improve the reliability and service life of the detection.

legrand switch industry applications

A torque switch is a precision measuring instrument for measuring various torques, rotational speeds, and mechanical power. The application range is very wide, mainly used for: 1) Detection of output torque and power of rotating power equipment such as motors, engines, and internal combustion engines; 2) Detection of torque and power of fans, water pumps, gearboxes, and torque wrenches; 3) Detection of torque and power in railway locomotives, automobiles, tractors, aircraft, ships, and mining machinery; 4) Can be used for detection of torque and power in sewage treatment systems; 5) Can be used to manufacture viscometers; 6) Can be used in process industries and flow industries; 7) Can be applied in laboratories, testing departments, as well as production monitoring and quality control. 1) Detection of output torque and power of rotating power equipment such as motors, engines, and internal combustion engines; 2) Detection of torque and power of fans, water pumps, gearboxes, and torque wrenches; 3) Detection of torque and power in railway locomotives, automobiles, tractors, aircraft, ships, and mining machinery; 4) Can be used for detection of torque and power in sewage treatment systems; 5) Can be used to manufacture viscometers; 6) Can be used in process industries and flow industries; 7) Can be applied in laboratories, testing departments, as well as production monitoring and quality control;

legrand switch classification

1) Non-contact torque switch In a non-contact torque switch, the input shaft and output shaft are connected by a torsion bar. The input shaft has splines, and the output shaft has keyways. When the torsion bar twists under the turning torque of the steering wheel, the relative position between the splines on the input shaft and the keyways on the output shaft changes. The change in relative displacement between the splines and keyways equals the twist amount of the torsion bar, causing a change in magnetic induction intensity on the splines. This change in magnetic induction intensity is converted into a voltage signal through coils. Due to the non-contact working method, non-contact torque switches have long service life, high reliability, are less prone to wear, have smaller delay, and are less affected by shaft deflection and axial offset, making them widely used in the passenger car sector. Common types of non-contact torque switches include strain gauge, magnetoelectric, fiber optic, and photoelectric switches. Strain gauge non-contact switches utilize wireless transmission technology. With technological advancements and the development of wireless transmission technology, the conductive slip rings and brush arms used for output signals in contact strain gauge switches can now be replaced by wireless transmission modules, thereby overcoming wear between conductive slip rings and brush arms and improving measurement accuracy. Magnetoelectric torque switches operate on the principle of magnetoelectric conversion, analyzing the phase difference of electromotive force signals from two outputs to achieve torque measurement. They are mainly divided into closed magnetic circuit switches and open magnetic circuit switches. Fiber optic torque switches mainly utilize the principles of light reflection and phase difference. Light signals reflected from two corresponding positions on the shaft are read, and the phase difference is calculated to determine the corresponding torque value. However, fiber optic switches are susceptible to environmental influences, and installation and debugging are relatively difficult. Photoelectric torque switches use photoelectric sensing elements as core components. When torque is applied to the drive shaft, the intensity of light emitted by the light source changes accordingly, causing a change in the output current of the photoelectric element. By measuring this change value, the torque value can be calculated. [3] 2) Strain gauge torque switch Strain gauge switch torque measurement employs strain electrical measurement technology. Strain gauges are bonded to the elastic shaft to form a measurement bridge. When the elastic shaft undergoes slight deformation due to torque, the resistance value of the bridge changes. This change in resistance of the strain bridge is converted into a change in electrical signal, thereby achieving torque measurement. The switch completes the following information conversion; the switch consists of an elastic shaft, measurement bridge, instrumentation amplifier, and interface circuit. 3) High-performance wireless switch High-performance wireless torque switches combine the switch with wireless communication technology to achieve wireless data transmission. The torque electrical signal is amplified and undergoes A/D conversion by a signal processing circuit controlled by a microcontroller. An encoder then encodes the collected digital quantity and transmits it to the transmission module for sending. After the receiving module receives the data, the decoder sends the decoded data to the microcontroller, which displays the obtained torque data value via LED. The switch data acquisition and transmission circuit consists of the torque switch, signal processing part, microcontroller, and wireless transmission circuit. The torque switch transmits the strain electrical signal generated by the resistance strain gauge to the signal processing circuit. The signal processing part extracts and amplifies the analog signal from the switch and performs analog-to-digital conversion. The microprocessor is responsible for controlling the operation of various components in the system and processing digital signals. Under the control of the microprocessor, the wireless transmission circuit encodes and processes the collected information data via an encoder and emits it using the transmission module to achieve wireless transmission. 4) Electronic switch An electronic torque meter is a portable, high-performance shaft power measuring instrument designed for fan and water pump testing and on-site energy efficiency evaluation. The electronic torque meter creatively eliminates the cumbersome, complex, and often difficult-to-implement installation process of traditional electromechanical torque switches in many field environments. It achieves real-time measurement of fan and water pump motor efficiency, monitors the operating status of fan and water pump motors at various stages during use, and provides real-time, authentic, and reliable data for studying the usage status of fan and water pump motors. It avoids the impact on test results caused by improper installation of electromechanical torque switches. The electronic torque meter can completely replace the shaft power measurement function of traditional torque switches and can obtain the real-time efficiency of fan and water pump motors, providing a rigorous and scientific evaluation method for energy saving in fan and water pump units.

legrand switch usage precautions

1) During installation, do not operate while energized, and do not directly strike or collide with the switch. 2) The fastening bolts of the coupling should be tightened, and a protective cover should be added to the outside of the coupling to avoid personal injury. 3) The signal line output must not be grounded or short-circuited to the power supply. The output current shall not exceed 10mA. The shield layer of the shielded cable must be connected to the common terminal (power ground) of the +15V power supply. 4) In daily metrological verification and calibration work, torque standard machines are usually used to calibrate torque switches. Since torque switches have high precision, typically Class 1 and above, in actual measurement work, besides the uncertainty of the torque standard machine itself, another important factor affecting the measurement results of the torque switch is the connection quality between the switch and the torque standard machine. Especially in the calibration of high-precision torque switches, when not considering the uncertainty of the torque standard machine itself, the quality of the connection will directly affect the accuracy of the measurement results. In existing torque switch measurement methods, the switch is usually connected in series to the torque standard machine for calibration, so issues regarding the reliability of the connection quality inevitably arise during the calibration process. In the past, to ensure the stability and firmness of the connection installation, rigid connection methods were usually used for installation. This method brings many inconveniences to detection personnel during assembly and disassembly. Coupled with the machining precision of components and the existence of fit clearances, significant changes in coaxiality between the measurement shaft systems occur during actual measurement, which seriously affects the accuracy of the measurement results. Although this defect can be reduced by laser alignment devices, due to the influence of various factors and differences in manual installation levels, coaxiality remains a major uncertainty factor affecting the measurement process when the torque switch is actually loaded.

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