German DSM MESSTECHNIK sensors, DSM MESSTECHNIK models, DSM MESSTECHNIK prices

DSM MESSTECHNIK sensors, also known as linear sensors, are linear devices based on metallic induction. The function of the sensor 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 sensors can be classified into analog and digital types. Analog types can be further divided into property-based and structural types. Commonly used displacement sensors are mostly analog structural types, including potentiometric displacement sensors, inductive displacement sensors, synchros, capacitive displacement sensors, eddy current displacement sensors, Hall effect displacement sensors, etc. An important advantage of digital displacement sensors is that they facilitate direct input of signals into computer systems. These sensors are developing rapidly and are increasingly widely applied.

DSM MESSTECHNIK Sensor Classification

1) Potentiometric displacement sensors convert mechanical displacement into resistance or voltage output that has a linear or arbitrary functional relationship with the displacement. Ordinary linear potentiometers and circular potentiometers can be used as linear displacement and angular displacement sensors, respectively. However, potentiometers designed for the purpose of measuring displacement require a definite relationship between displacement change and resistance change. The movable wiper of the potentiometric displacement sensor is connected to the measured object. The displacement of the object causes a change in resistance at the moving end of the potentiometer. The magnitude of the resistance change reflects the magnitude of the displacement, while an increase or decrease in resistance indicates the direction of displacement. Typically, a supply voltage is applied across the potentiometer to convert the resistance change into a voltage output. In wire-wound potentiometers, the resistance changes in steps corresponding to the turn-to-turn resistance as the wiper moves, resulting in a stepped output characteristic. If such a displacement sensor is used as a displacement feedback element in a servo system, excessive step voltages may cause system oscillation. Therefore, the resistance per turn should be minimized during the manufacture of the potentiometer. Another major disadvantage of potentiometric sensors is their susceptibility to wear. Their advantages include simple structure, large output signal, ease of use, and low cost. 2) Magnetostrictive displacement sensors accurately measure the actual displacement value of the detected product by detecting the absolute position of a movable magnetic ring using non-contact measurement technology. The high precision and high reliability of this sensor have been widely applied in thousands of practical cases. Since the movable magnetic ring, which determines the position, does not come into direct contact with the sensitive element, the sensor can be used in extremely harsh industrial environments and is not easily affected by oil stains, solutions, dust, or other contaminants. Its IP protection rating is above IP67. Furthermore, the sensor utilizes advanced materials and sophisticated electronic processing technology, allowing it to operate in environments with high temperature, high pressure, and high vibration. The sensor output signal is an absolute displacement value; even if the power is interrupted and reconnected, data will not be lost, and there is no need to re-zero. Because the sensitive element is non-contact, repeated detection will not cause any wear to the sensor, significantly improving detection reliability and service life. The magnetostrictive displacement sensor accurately measures position by utilizing the magnetostrictive principle, where the intersection of two different magnetic fields generates a strain pulse signal. The measuring element is a waveguide, and the sensitive element inside the waveguide is made of special magnetostrictive material. The measurement process involves generating a current pulse in the electronics housing of the sensor. This current pulse travels through the waveguide, generating a circumferential magnetic field outside the waveguide. When this magnetic field intersects with the magnetic field generated by the movable magnetic ring sleeved on the waveguide (which changes with position), a strain mechanical wave pulse signal is generated within the waveguide due to the magnetostrictive effect. This strain mechanical wave pulse signal propagates at a fixed speed of sound and is quickly detected by the electronics housing. Since the transmission time of this strain mechanical wave pulse signal within the waveguide is proportional to the distance between the movable magnetic ring and the electronics housing, measuring the time allows for highly precise determination of this distance. Because the output signal is a true absolute value, rather than a proportional or amplified signal, there is no signal drift or value variation, and regular recalibration is not required. The magnetostrictive displacement sensor is a high-precision, long-stroke absolute position measurement displacement sensor manufactured based on the magnetostrictive principle. It employs a non-contact measurement method. Since the movable magnetic ring used for measurement does not come into direct contact with the sensor itself, it is not subject to friction or wear, resulting in long service life, strong environmental adaptability, high reliability, good safety, and ease of integration into automated systems. It can operate normally even in harsh industrial environments. Additionally, it can withstand high temperatures, high pressures, and strong vibrations, and is now widely used in the measurement and control of mechanical displacement.

DSM MESSTECHNIK Sensor Operating Principle

The magnetostrictive displacement (level) sensor accurately measures position by utilizing the magnetostrictive principle, where the intersection of two different magnetic fields generates a strain pulse signal. The measuring element is a waveguide, and the sensitive element inside the waveguide is made of special magnetostrictive material. The measurement process involves generating a current pulse in the electronics housing of the sensor. This current pulse travels through the waveguide, generating a circumferential magnetic field outside the waveguide. When this magnetic field intersects with the magnetic field generated by the movable magnetic ring sleeved on the waveguide (which changes with position), a strain mechanical wave pulse signal is generated within the waveguide due to the magnetostrictive effect. This strain mechanical wave pulse signal propagates at a fixed speed of sound and is quickly detected by the electronics housing. Since the transmission time of this strain mechanical wave pulse signal within the waveguide is proportional to the distance between the movable magnetic ring and the electronics housing, measuring the time allows for highly precise determination of this distance. Because the output signal is a true absolute value, rather than a proportional or amplified signal, there is no signal drift or value variation, and regular recalibration is not required.

DSM MESSTECHNIK Sensor Application Fields

It is widely used for level measurement and control in various liquid tanks in industries such as petroleum, chemical, water conservancy, pharmaceuticals, food, and beverages, as well as in aerospace refueling systems, automotive refueling systems, diesel refueling systems, various hydraulic tanks, hydrological monitoring, and water treatment. The magnetostrictive displacement sensor is a high-precision, long-stroke absolute position measurement displacement sensor manufactured based on the magnetostrictive principle. It employs an internal non-contact measurement method. Since the movable magnetic ring used for measurement does not come into direct contact with the sensor itself, it is not subject to friction or wear, resulting in long service life, strong environmental adaptability, high reliability, good safety, and ease of integration into automated systems. It can operate normally even in harsh industrial environments (such as those prone to oil stains, dust, or other contamination) [01]. Additionally, it can withstand high temperatures, high pressures, and strong vibrations, and is now widely used in the measurement and control of mechanical displacement. Its stroke can reach 3 meters or more, with a nominal accuracy of 0.05% F·S. For sensors with a stroke of 1 meters or more, the accuracy can reach 0.02% F, S, and repeatability can reach 0.002% F·S. Therefore, it is widely applied in industries such as petrochemical, aerospace, electric power, and water conservancy.

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