Working principle of the Italian GEFRAN displacement sensor

The working principle of the Italian GEFRAN displacement sensor

The Italian GEFRAN displacement sensor, also called a linear sensor, is a linear device belonging to metal induction. The function of the sensor is to convert various measured physical quantities in electrical quantities. In the production process, the measurement of displacement is generally divided into two types: the measurement of physical size and mechanical displacement. According to the different forms of the measured variable transformation, the displacement sensor can be divided into two types: analog type and digital type. The analog type can be divided into physical type and structural type. Commonly used displacement sensors are mostly analog structure types, including potentiometer displacement sensors, inductive displacement sensors, automatic alignment machines, capacitive displacement sensors, eddy current displacement sensors, Hall displacement sensors, etc.A key advantage of digital displacement sensors is the convenience of sending signals directly to computer systems. This kind of sensor is developing rapidly and widely used.

Italian GEFRAN displacement sensor potentiometer type displacement sensor, displacement sensor (Figure 2)

displacement sensor (Figure 2)

The displacement is converted into a resistance or output voltage that is linear or is arbitrary. Ordinary linear potentiometers and round potentiometers can be used as linear displacement and angular displacement sensors, respectively. However, a potentiometer designed to measure displacement requires a clear relationship between the change in displacement and the change in resistance. The movable brush of the potentiometer-type displacement sensor is connected to the measured object.

The movement of the object causes the resistance at the moving end of thepotentiometer changes. The amount of change in resistance reflects the magnitude of displacement, and the increase or decrease in resistance indicates the direction of displacement. Usually the supply voltage is passed through the potentiometer to convert the resistance change into an output voltage. Since the resistance of the wire wound potentiometer changes with the step of the turning resistor as the brush moves, the output characteristics are also stepped. If this kind of displacement sensor is used as a displacement feedback element in a servo system, too high a step voltage will cause system oscillation. Therefore, in the production of potentiometers, the resistance value of each revolution should be reduced as much as possible. Another major drawback of potentiometer sensors is wear. The advantages are: simple structure, large output signal, easy to use and low price.

The magnetostrictive displacement sensor detectedAccurately detects the absolute position of the movable magnetic ring through non-contact measurement and control technology to measure the actual displacement value of the detected product; the high precision and high reliability of the sensor have been widely used in thousands of practical cases.

Since there is no direct contact between the movable magnetic ring and the sensitive element as the determined position, the displacement sensor (Figure 3)

The displacement sensor (Figure 3)

Therefore, the sensor can be used in extremely harsh industrial environments and is not easily affected by oil spills, solutions, dust or other pollution, and the IP protection level is higher than IP67. In addition, the sensor uses high-tech materials and advanced electronic processing technology, so it can be used in high temperature, high pressure and high vibration environments. The output signal of the sensor isan absolute displacement value, Even if the power is interrupted and reconnected, the data is not lost and resetting to zero is not necessary. Since the sensitive element is non-contact, even if the detection is repeated continuously, it will not cause wear to the sensor, which can greatly improve the reliability and life of the detection.

The magnetostrictive displacement sensor uses the principle of magnetostriction to accurately measure position by generating a voltage pulse signal through the intersection of two different magnetic fields. The sensing element is a waveguide and the sensitive element in the waveguide is made of a special magnetostrictive material. The measurement process is to generate a current pulse in the electronic chamber of the sensor, and the current pulse is sent into the waveguide, generating a circular magnetic field outside the waveguide. At the same time, alls due to magnetostriction, a mechanical wave pulse signal is generated in the waveguide. This mechanical wave pulse signal is transmitted at a fixed speed of sound and is rapidly detected by the electronic chamber.

Since the transmission time of the mechanical wave pulse signal in the waveguide is proportional to the distance between the movable magnetic ring and the electronic chamber, the displacement sensor (Figure 4)

The displacement sensor (Figure 4 ) 4)

By measuring time, this distance can be determined with a high degree of accuracy. Since the output signal is a true absolute value, not a proportional or amplified signal, there is no signal drift or value change and frequent rescaling is not necessary.

Magnetostrictive displacement sensor is a high-precision long-stroke displacement sensor for absolute position measurement, manufactured according to the principle of magnetostriction. It usesa non-contact measurement method. Since the movable magnetic ring used for the measurement does not come into direct contact with the sensor itself, it will not be rubbed or worn. Therefore, it has long service life, strong environmental adaptability, high reliability. good safety and convenient operation The system works automatically and can operate normally even in harsh industrial environments. In addition, it can withstand high temperature, high pressure and strong vibration, and is widely used in the measurement and control of mechanical displacement.

The company mainly deals with European and American brands and can source brands from any European country. For example, the dominant brands in Germany are: Germany BURKERT, Germany DEMAG Demag, Germany HAWE, Germany REXROTH Rexroth , Germany HYDAC Hydac, Germany PILZ Pilz relay, Germany FESTO Festo, Germany IFM Ifm sensor, Germany E+H Enders Haus, Duitsland Heidenhain HEIDENHAIN, Germany P+F Pepperl+Fuchs sensor, Germany SICK, Germany TURCK Turck, Germany HIRSCHMANN Hessman industrial switches. Germany Hensler, Germany MURR Moore, Germany Schmersal SCHMERSAL, Germany SAMSON Samson, Germany EPRO Emerson\'s

US MOOG, US ASCO solenoid valve, US MAC solenoid valve, US NUMATICS Newmantic, US Parker pieGram pneumatic hydraulics, VICKERS out United States, ROSS from United States

NORGREN from United Kingdom

OMAL from Italy, ATOS from Italy, CAMOZZI from Italy, UNIVER from Italy, Italy Kang Maosheng</p

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