The latest introduction of Eltra magnetostrictive sensor

The Eltra magnetostrictive sensor is a commonly used testing instrument, which has many advantages such as accurate measurement, easy maintenance, and wide measurement range.

　　1, frequency response characteristics

　　The frequency response characteristic of the sensor determines the frequency range to be measured, and the measurement conditions must be kept undistorted within the allowable frequency range. In fact, the response of the sensor always has a fixed delay, and it is hoped that the delay time is as short as possible.

　　 The frequency response of the sensor is high, and the measurable signal frequency range is wide. Due to the influence of the structural characteristics, the inertia of the mechanical system is larger, and the frequency of the measurable signal is lower due to the low frequency sensor.

　　In dynamic measurement, the response characteristics should be based on the characteristics of the signal (steady state, transient state, random, etc.) to avoid over-fire errors. 　　2, linear range

　　 The linear range of the sensor refers to the range where the output is proportional to the input. In theory, the sensitivity remains constant within this range. The wider the linear range of the sensor, the larger the range, and a certain measurement accuracy can be guaranteed. When selecting a sensor, when the type of sensor is determined, first see whether its range meets the requirements.

　　 But in fact, no sensor can guarantee absolute linearity, and its linearity is also relative. When the required measurement accuracy is relatively low, within a certain range, the sensor with less nonlinear error can be approximately regarded as linear, which will bring great convenience to the measurement.

　　3, stability

　　The ability of the sensor to keep its performance unchanged after a period of use is called stability. In addition to the structure of the sensor itself, the factors affecting the long-term stability of the sensor are mainly the use environment of the sensor. Therefore, to make the sensor have good stability, the sensor must have strong environmental adaptability.

　　Before selecting a sensor, investigate its use environment, and select the appropriate sensor according to the specific use environment, or take appropriate measures to reduce the environmental impact.

　　The stability of the sensor has a quantitative index. After the expiration date, it should be re-calibrated before use to determine whether the performance of the sensor has changed.

　　 In some occasions that require the sensor to be used for a long time but cannot be easily replaced or calibrated, the stability of the selected sensor is more stringent and must be able to withstand the test of a long time.

　　4, accuracy

　　Accuracy is an important performance index of the sensor, and it is an important link related to the measurement accuracy of the entire measurement system. The higher the accuracy of the sensor, the more expensive it is. Therefore, the accuracy of the sensor only needs to meet the accuracy requirements of the entire measurement system, and it is not necessary to select too high. In this way, a cheaper and simpler sensor can be selected among many sensors that meet the same measurement purpose.

Magnetostrictive displacement sensor-through the non-contact measurement and control technology to accurately detect the absolute position of the movable magnetic ring to measure the actual displacement value of the detected product; the sensor's high precision and high reliability have been widely used in thousands Tens of thousands of actual cases.

　　 Since the movable magnetic ring and the sensitive element are not directly in contact with the position, the sensor can be used in extremely harsh industrial environments, and is not easily affected by oil, solution, dust or other pollution. The IP protection level is above 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 sensor output signal is an absolute displacement value, even if the power is interrupted or reconnected, the data will not be lost, and there is no need to reset to zero. Because the sensitive element is non-contact, even if the detection is repeated continuously, it will not cause any wear to the sensor, which can greatly improve the reliability and service life of the detection.

The Italian Eltra magnetostrictive displacement sensor uses the principle of magnetostriction to generate a strain pulse signal through the intersection of two different magnetic fields to accurately measure the position. The measuring element is a wave guide, and the sensitive element in the wave guide is made of special magnetostrictive material. The measurement process is that a current pulse is generated in the electronic chamber of the sensor, and the current pulse is transmitted in the waveguide, thereby generating a circular magnetic field outside the waveguide. When the magnetic field intersects the magnetic field generated by the movable magnetic ring sheathed on the waveguide as a position change At this time, due to the action of magnetostriction, a strained mechanical wave pulse signal is generated in the waveguide. This strained mechanical wave pulse signal is transmitted at a fixed sound speed and is quickly detected by the electronic room. Since the transmission time of this strain mechanical wave pulse signal in the waveguide is proportional to the distance between the active magnetic ring and the electronic chamber, this distance can be determined with high accuracy by measuring the time. Since the output signal is a true absolute value, not a proportional or amplified signal, there is no signal drift or change in value, and there is no need for regular re-marking.

　　 Magnetostrictive displacement sensor is a high-precision, long-stroke absolute position measurement displacement sensor manufactured according to the principle of magnetostriction. It uses a non-contact measurement method. Because the movable magnetic ring used for measurement does not directly contact the sensor itself, it will not be rubbed or worn. Therefore, it has a long service life, strong environmental adaptability, high reliability, good safety, and convenience. The system is automated and can work normally even in harsh industrial environments. In addition, it can withstand high temperature, high pressure and strong vibration, and has been widely used in the measurement and control of mechanical displacement.

Features of Eltra Magnetostrictive Liquid Level Sensor:

　　 1. Easy to install

　　 2. Long service life

　　3. Isolation and explosion-proof

　　4. No need for regular re-standard and maintenance

　　 5. Lightning protection, radio frequency interference

　　6. ​​Multiple signal output mode selection

　　7. With reverse polarity protection

　　 8. Exquisite structure, strong environmental adaptability

　　9. High precision, high stability, high reliability

　　10. Can monitor the liquid level of the pressurized or non-pressurized liquid tank

　　Italy Iltra eltra magnetostrictive liquid level sensor application:

　　 1. Oil tank level measurement

　　 2. Dam water level monitoring

　　3. Liquid level control of pharmaceutical tank

　　4. Chemical process level control

　　 5. Food and beverage liquid tank control

　　 6. Drinking water and sewage treatment

　　Italian Iltra eltra magnetostrictive liquid level sensor performance index:

　　 1. Resolution: better than 0.01% FS

　　2. Late lag: better than 0.01%FS

　　 3. Zero adjustment range: 20%FS

　　 4. Full scale adjustment range: 20%FS

　　 5. Frequency response time: 0.2~5ms

　　 6. Repeatability error: better than 0.01% FS

　　7. Temperature influence: ±0.007%FS/℃

　　 8. Non-linear error (±%FS): 0.05; the maximum error is 150μm below the range of 300mm.

　　 Eltra eltra magnetostrictive liquid level sensor uses the time when the strain pulse signal generated when two different magnetic fields are intersected is detected to calculate the accurate position of the magnetic field intersection point. A magnetic field is excited by a pulse generated by the electronic component of the sensor’s electronic compartment. The magnetic field generated by the excitation pulse moves from the end of the electronic compartment to the end at the speed of light along the waveguide filament made of high magnetostrictive material in the sensor rod. When it intersects with the active permanent magnetic field (the permanent magnet is generally installed on the moving plate where the detection position is needed), due to the magnetostriction phenomenon, the waveguide wire generates a mechanical strain pulse at the intersection point, and from this point through the waveguide wire to the electron at the speed of sound The warehouse end returns, and the strain pulse is detected by the detection circuit in the electronic warehouse. Therefore, the time between transmitting an active pulse wave and receiving a strain pulse wave is the time for the speed of sound to travel in the waveguide filament.