In the field of industrial automation and process control, liquid level measurement is a key link to ensure production safety, improve product quality, and optimize process flow. With the continuous advancement of technology, magnetostrictive liquid level gauges have demonstrated strong competitiveness in the field of liquid level measurement due to their measurement principles, performance characteristics, and wide application scenarios. This article will delve into the measurement principle, significant characteristics, and applications of magnetostrictive level gauges in various industries.

1、 Measurement principle of magnetostrictive liquid level gauge

The core of magnetostrictive level gauge lies in its magnetostrictive effect. The device mainly consists of three parts: electronic transmitter (circuit unit), float (built-in permanent magnetic ring), and detection rod (waveguide or measuring rod). The detection rod is made of special magnetostrictive material, which can respond to changes in external magnetic field and produce small stretching deformation.

working principle：

1. Pulse excitationThe electronic transmitter periodically sends a brief current pulse to the detection rod, which generates a rapidly propagating magnetic field inside the rod.

2. Magnetic field interactionThe float moves up and down with the rise and fall of the measured liquid levelThe department is equipped with permanentMagnetic ring, forming a static magnetic field. When the pulse magnetic field generated by the transmitter meets the static magnetic field of the float, it will cause magnetostriction effect at the interaction position between the two, resulting in a small torsional wave pulse generated by the detection rod at that point.

3. Signal detection and processingThe torsional wave pulse propagates at a fixed ultrasonic velocity along the probe rod in the opposite direction to the electronic transmitter, which is detected by the detection mechanism and converted into an electrical signal. By accurately measuring the time difference between the initial pulse emission and the reception of the torsional wave signal, combined with the known propagation speed of the torsional wave, the actual distance of the float (and liquid level) relative to the bottom of the sensor can be calculated, thereby determining the liquid level height.

2、 Significant Characteristics of Magnetostrictive Liquid Level Gauge

1. Fast measurement response speedMagnetostrictive level gauges can quickly respond to changes in liquid level, achieve real-time monitoring, and meet the demand for rapid response in industrial production.

2. High stability and reliabilityAdopting non-contact measurement method, there is no mechanical friction between the float and the detection rod, reducing wear and failure rate, ensuring long-term stable operation.

3. Multiple output modes to choose from: Supports analog signals (such asMultiple output modes such as 4-20mA and digital signals (such as RS485, HART) are available for easy integration with various control systems.

4. Easy to install, no need for regular calibration and maintenanceThe structure is exquisite, easy to install, and due to the use of magnetostrictive principle, there is no need for regular calibration, resulting in low maintenance costs.

5. High resolution, high precisionCapable of achieving millimeter level or even higher precision liquid level measurement, meeting the high requirements for liquid level measurement accuracy in industrial settings.

6. Exquisite structure and strong environmental adaptabilityHigh protection level of the shell (such asIP67）， It has good anti fouling, dustproof, and high pressure resistance properties, and is suitable for various harsh environments.

7. Non contact measurement, no wear and tearThere is no direct contact between the float and the detection rod, avoiding measurement errors and equipment failures caused by friction and wear.

3、 Application Fields of Magnetostrictive Liquid Level Gauge

Magnetostrictive level gauge relies on itsexcellentIts performance characteristics have been widely applied in multiple industries:

1. petrochemicalMonitor the liquid level in equipment such as oil tanks and reaction vessels to ensure production safety and optimize the process flow.

2. Food and BeverageMonitor liquid levels in storage tanks, fermentation tanks, and other equipment to ensure product quality and meet food safety standards.

3. pharmaceutical industryMonitor the liquid level during the drug production process to ensure the cleanliness of the production environment and the stability of drug quality.

4. Environmentally Friendly Water TreatmentMonitor the liquid level in equipment such as sewage treatment tanks and sedimentation tanks to ensure the smooth progress of the sewage treatment process.

5. energy sectorMonitor water levels in facilities such as hydroelectric and nuclear power plants to ensure the safety and stability of energy supply.

4、 Conclusion

Magnetostrictive level gauges have demonstrated strong competitiveness in the field of liquid level measurement due to their measurement principles, performance characteristics, and wide application scenarios. With the continuous development of industrial automation and process control technology, magnetostrictive level gauges will play an important role in more fields, providing strong guarantees for the safe, efficient, and stable operation of industrial production. In the future, with the continuous advancement and innovation of technology, the performance of magnetostrictive level gauges will be further improved, and their application fields will become more extensive.