German SCHAEFER TECH sensors, SCHAEFER TECH models, SCHAEFER TECH prices

SCHAEFER TECH sensors are devices or assemblies that can sense pressure signals and convert them into usable output electrical signals according to a specific pattern. Pressure sensors typically consist of a pressure-sensitive element and a signal processing unit. Depending on the type of test pressure, pressure sensors can be classified into gauge pressure sensors, differential pressure sensors, and absolute pressure sensors. Pressure sensors are among the most commonly used sensors in industrial practice, widely applied in various industrial automation environments, involving water conservancy and hydropower, railway transportation, smart buildings, production automation control, aerospace, military industry, petrochemicals, oil wells, electric power, ships, machine tools, pipelines, and many other industries.

SCHAEFER TECH sensor classification

1) Linear displacement sensor: The function of a linear displacement sensor is to convert linear mechanical displacement into an electrical signal. To achieve this effect, a variable resistor slide rail is usually fixed at a stationary part of the sensor, and different resistance values are measured by the displacement of the wiper on the slide rail. The sensor slide rail is connected to a stable DC voltage, allowing a small current in microamperes to flow. The voltage between the wiper and the starting end is proportional to the length of the wiper's movement. Using the sensor as a voltage divider minimizes the requirement for the accuracy of the total resistance of the slide rail, because resistance changes caused by temperature variations do not affect the measurement result. 2) Angular displacement sensor: Angular displacement sensors are applied in obstacle handling: using angle sensors to control your wheels can indirectly detect obstacles. The principle is very simple: if the motor angle sensor is constructed to operate but the gear does not turn, it indicates that your machine has been blocked by an obstacle. This technology is very simple to use and highly effective; the only requirement is that the moving wheel must not slip on the floor (or slip too frequently), otherwise you will not be able to detect obstacles. Connecting an idler gear to the motor can avoid this problem; this wheel is not driven by the motor but is driven by the movement of the device: during the rotation of the drive wheel, if the idler wheel stops, it means you have encountered an obstacle.

SCHAEFER TECH sensor usage precautions

1) If the electronic ruler has been in use for a long time, and the seal has aged while accumulating many impurities, water mixtures and oil will seriously affect the contact resistance of the brush, causing the displayed numbers to jump continuously. In this case, it can be said that the electronic ruler of the linear displacement sensor is damaged and needs to be replaced. 2) If the power supply capacity is too small, many issues may arise; therefore, the power supply must have sufficient capacity. Insufficient capacity will cause the following situations: the movement of the molten glue will cause fluctuations in the display of the mold-clamping electronic ruler, or the mold-clamping movement will cause fluctuations in the display of the injection-molding electronic ruler, resulting in significant measurement errors. If the drive power supply of the solenoid valve is combined with the power supply of the linear displacement sensor, the above situations are more likely to occur. In severe cases, voltage fluctuations can even be measured using the voltage range of a multimeter. If the situation is not caused by high-frequency interference, electrostatic interference, or poor neutral grounding, it is likely due to insufficient power supply capacity. 3) Frequency modulation interference and electrostatic interference can both cause the displayed numbers on the electronic ruler of the linear displacement sensor to jump. The signal lines of the electronic ruler must be routed in separate cable trays from the high-voltage lines of the equipment. The electronic ruler must mandatorily use a grounding bracket, ensuring good contact between the housing of the electronic ruler and the ground. Shielded cables must be used for signal lines, and one end of the shielded cable should be grounded at the electrical cabinet. When high-frequency interference is present, voltage measurements with a multimeter usually appear normal, but the displayed numbers keep jumping. The situation is similar when electrostatic interference occurs. To verify whether it is electrostatic interference, you can short-circuit the cover screw of the electronic ruler to some metal part of the machine using a piece of power cord. Once short-circuited, the electrostatic interference will be eliminated immediately. However, it is difficult to eliminate high-frequency interference using the above method. Variable frequency drives and robotic arms often generate high-frequency interference, so you can try stopping the high-frequency energy saver or the robotic arm to verify if it is high-frequency interference. 4) If the display data of the electronic ruler of the linear displacement sensor jumps regularly at a certain point during operation, or if there is no display data, check whether the insulation of the connection wire is damaged and causing a regular short circuit to ground due to contact with the machine housing. 5) The supply voltage must be stable. Industrial voltage requires stability within ±0.1[%]. For example, if the reference voltage is 10V, a fluctuation of ±0.01V is allowed. Otherwise, it will cause significant display fluctuations. However, if the amplitude of the display fluctuation does not exceed the amplitude of the voltage fluctuation, the electronic ruler is considered normal. 6) The alignment of the linear displacement sensor installation must be precise, but parallelism allows an error of ±0.5mm, and angularity allows an error of ±12°. However, if both parallelism and angularity errors are excessive, the displayed numbers will jump. In such cases, parallelism and angle adjustments must be performed. 7) During connection, pay close attention: the three wires of the electronic ruler must not be connected incorrectly, and the power line and output line must not be swapped. If the wires are connected incorrectly, it will result in significant linearity errors, making control difficult and reducing control precision, while the display is prone to jumping phenomena.

SCHAEFER TECH sensor applications

The geometric state parameters of train wheel flanges affect the speed and smoothness of train operation and are crucial for safe train operation. Traditional detection methods are relatively complex, usually using special rulers with verniers for measurement, which leads to large measurement errors due to manual data reading and prevents digital management of detection data. With the development of China's railway industry, train speeds are increasing, making precise and rapid inspection and digital management of train wheel flange state parameters increasingly important. The flange detector adopts modern sensor technology, microcontroller processing systems, and concise and stable mechanical structures, enabling convenient and precise continuous rapid measurement of geometric state parameters, achieving digitization of parameter measurements such as flange height and rim thickness. Many sensors are used for detecting flange height, width, rim thickness, etc., with displacement sensors being the most concerned. There are many types of displacement sensors, and the current new sensor technology used for train wheel flange shape detection is called laser displacement sensors. Currently, the laser triangulation method is used for detection on train wheel flanges, offering high measurement accuracy over short distances. The displacement sensor can be directly installed on the track for detection, or a laser reflective displacement sensor can be used as the measuring device. The laser sensor module scans the flange shape along a straight line direction while recording the entire flange data. Through a microprocessor, the entire flange contour curve can be obtained, thereby calculating flange width, flange height, 70mm wear amount, and wear area, etc. Furthermore, the measured data can be uploaded to a computer to generate a database, utilizing advanced post-processing software for digital management of train wheel flanges. It can not only measure wheelset wear on online operating trains but also sort wheelsets on the production line based on whether their dimensions are qualified. The development of transportation relies on detection technology, and instruments, meters, and sensor technology are the core of detection technology. In today's era of rapid high-speed power development, people not only hope to experience comfort and enjoyment but also desire safety. The development of sensor technology will bring more safety to people's lives and transportation, and the development of sensor technology in China will also drive the development of world-class advanced technologies in transportation internationally.

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