SCHISCHEK switch German SCHISCHEK model SCHISCHEK price

SCHISCHEK switch, also known as a linear switch, is a linear device based on metal induction. The function of the switch is to convert various measured physical quantities into electrical signals. In production processes, displacement measurement is generally divided into two types: measuring physical dimensions and measuring mechanical displacement. Depending on the form of transformation of the measured variable, displacement switches can be divided into analog and digital types. Analog types can be further divided into property-based and structural types. Commonly used displacement switches are mostly analog structural types, including potentiometric displacement switches, inductive displacement switches, synchros, capacitive displacement switches, eddy-current displacement switches, and Hall-effect displacement switches. An important advantage of digital displacement switches is that they facilitate direct input of signals into computer systems. This type of switch is developing rapidly and its applications are becoming increasingly widespread.

SCHISCHEK switch industry applications

A torque switch is a precision measuring instrument for measuring various torques, rotational speeds, and mechanical power. It has a wide range of applications, 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;

SCHISCHEK 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 torque applied by 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 flux density on the splines. This change in magnetic flux density is converted into a voltage signal via a coil. Due to its non-contact operating mode, the non-contact torque switch offers long service life, high reliability, resistance to wear, lower delay, and reduced sensitivity to shaft deflection and axial offset. It is widely used in the passenger car sector. Common types of non-contact torque switches include strain-gauge, magneto-electric, fiber-optic, and photoelectric switches. Strain-gauge non-contact switches utilize wireless transmission technology. With advancements in technology and wireless transmission, the conductive slip rings and brush arms previously used for outputting signals from contact-type strain gauge switches can now be replaced by wireless transmission modules. This overcomes wear between slip rings and brush arms, improving measurement accuracy. Magneto-electric torque switches operate on the principle of magneto-electric conversion, analyzing the phase difference between two output electromotive force signals to measure torque. They are mainly classified into closed-magnetic-circuit switches and open-magnetic-circuit switches. Fiber-optic torque switches primarily use light reflection and phase difference principles. Light signals reflected from two corresponding positions on the shaft are read, and the phase difference is calculated to determine the 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, 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 of the bridge changes. This change in resistance is converted into an electrical signal change, thereby achieving torque measurement. The switch performs the following information conversion; it consists of an elastic shaft, a measurement bridge, an instrumentation amplifier, and an interface circuit. 3) High-performance wireless switch The high-performance wireless torque switch combines the switch with wireless communication technology to achieve wireless data transmission. The torque electrical signal is amplified and subjected to A/D conversion by a microcontroller-controlled signal processing circuit. An encoder then encodes the acquired digital quantity and transmits it to a transmission module. After the receiving module receives the data, a decoder sends the decoded data to the microcontroller, which displays the obtained torque data value via LED. The switch's data acquisition and transmission circuit consists of the torque switch, signal processing section, 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 section extracts and amplifies the analog signal from the switch and performs analog-to-digital conversion. The microprocessor controls the operation of various components in the system and processes the digital signals. Under the control of the microprocessor, the wireless transmission circuit uses an encoder to encode and process the acquired information data, which is then transmitted by the emission module, achieving wireless transmission. 4) Electronic switch The electronic torque meter is a portable, high-performance shaft power measuring instrument designed for fan and 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 enables real-time measurement of fan and pump motor efficiency, monitors the operational status of fan and pump motors at various stages during use, and provides real-time, authentic, and reliable data for studying the usage status of fan and pump motors. It avoids impacts 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 obtain the real-time efficiency of fan and pump motors, providing a rigorous and scientific evaluation method for energy saving in fan and pump units.

SCHISCHEK switch usage precautions

1) During installation, do not operate while energized. Do not directly strike or collide with the switch. 2) Tighten the fastening bolts of the coupling. Add a protective cover to the outside of the coupling to prevent personal injury. 3) The signal line output must not be grounded or short-circuited to the power supply. The output current must 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 switches are typically calibrated using a torque standard machine. Since torque switches have high accuracy, usually Class 1 and above, another important factor affecting measurement results, besides the uncertainty of the torque standard machine itself, is the quality of the connection 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 with the torque standard machine for calibration. Therefore, 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 connections were typically used. This method brings many inconveniences to inspectors during assembly and disassembly. Additionally, due to the machining precision of components and the existence of fit clearances, the coaxiality between the measurement shaft systems changes significantly during actual measurement, seriously affecting the accuracy of the measurement results. Although this defect can be reduced using laser alignment devices, influenced by various factors and differences in manual installation skills, coaxiality remains a major source of uncertainty in the metrology process when the torque switch is under actual load.

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