The draw-wire displacement sensor is also called a draw-wire sensor, a draw-wire electronic ruler, or a draw-wire encoder. The draw-wire displacement sensor is a sophisticated structural construction of a linear displacement sensor. It fully combines the advantages of an angle sensor and a linear displacement sensor to become a sensor with a small installation size, compact structure, large measuring stroke, and high accuracy. The stroke ranges from hundreds of millimeters to tens of meters. A draw-wire sensor (also called a string pot, cable extension transducer）is a linear position sensor that measures the displacement or velocity of a moving object. It works by converting the linear motion of a flexible measuring wire into a rotary motion, which is then translated into an electrical signal.

From October 21st to 24th, 2025, the SOP team will participate in Electronics Show 2025 in Korea, and Tina and Jenny, as representatives of SOP Group, will attend the Electronics Show in Korea.

Linear displacement sensor is used to measure the displacement change of an object or structure on a linear axis. Its main uses include: 1.Industrial automation: The linear displacement sensor can be used for automatic control on industrial production lines, such as measuring the position of workpieces on mechanical arms, conveyor belts or machine tools, so as to carry out accurate and stable control.

Pulling-rope displacement sensor is widely used in hydraulic universal testing machine. Its main function is to measure the cylinder stroke of the testing machine, and send it to the controller by pulse signal during the test, so as to obtain the elongation of the tested material. If traditional scale or manual measurement is used, it will not only be inefficient, but also fail to achieve the measured test accuracy. However, the pulling rope displacement sensor has the characteristics of high accuracy of 0.01%, fast response speed, low cost and convenient installation. Compared with grating ruler and other products, it not only improves the displacement accuracy of testing machine, but also reduces the cost of the whole machine.

Pressure sensors are widely used in hydropower generation, railway transportation, intelligent building, production automation, petrochemical, oil wells, electric power, ships, machine tools, pipelines and many other industries.

Pulling rope displacement sensor is a precision device that measures displacement by stretching and retracting the rope, widely used in industrial automation, mechanical manufacturing and other fields. The core principles, application scenarios, and usage methods are as follows:

The pull rope displacement sensor is especially suitable for linear guide rail system, hydraulic cylinder system, testing machine, telescopic system (forklift, press, elevator, pipe bender, bender, etc.), crane or cable winch, reservoir dam protection system, gate opening control system, testing machine pressure machinery, hydraulic universal experimental machinery, storage position positioning, pressure machinery, paper-making machinery, textile machinery, sheet metal machinery, packaging machinery, printing machinery. Construction machinery, horizontal controller, construction machinery, industrial robot, injection machine, woodworking machinery, elevator, air compressor/hydraulic press, height machine, X-Y axis and other length displacement, etc., dimension measurement and position control, especially suitable for the control of electro-hydraulic servo hydraulic universal testing machine.

Draw wire sensor is also called rope ruler and rope encoder. Its working principle is very simple, that is, the wire rope at the outlet of the sensor is pulled, in which the wire rope is wound on a pulley built in the sensor. When the wire rope is pulled, the other end of the sensor is connected to the mechanical motion, and a display is installed on it to convert the mechanical motion into an electrical signal to obtain the required data. In operation, the pull rope displacement sensor is installed at a fixed position, and the pull rope is tied to the moving object. The linear motion of the pull rope is aligned with the motion axis of the moving object. When the movement occurs, the rope stretches and contracts. An internal spring ensures that the tension of the pull rope is constant. The threaded hub drives the precision rotation sensor to rotate, and outputs an electrical signal proportional to the moving distance of the pull rope. The displacement, direction or velocity of the moving object can be obtained by measuring the output signal. Commonly used parameters include measuring stroke, output signal mode, linearity, repeatability, resolution, wire diameter specification, outlet tension, maximum round-trip speed, weight, input resistance, power, working voltage, working temperature, vibration, protection level, etc.

Common pressure sensors include resistance strain gauge pressure sensor, semiconductor strain gauge pressure sensor, positive pressure sensor, inductive pressure sensor, capacitive pressure sensor, resonant pressure sensor, capacitive acceleration sensor, optical fiber pressure sensor and so on. Piezoresistive pressure sensor is the most widely used pressure sensor, which has the characteristics of low price, high precision and good linearity.

Pressure sensor is the most widely used sensor, which is used in various industrial automatic control environments, involving water conservancy and hydropower, railway transportation, intelligent building, production automatic control, aerospace, military industry, petrochemical, oil wells, electric power, ships, machine tools, pipelines and many other industries.