Magnetostrictive level measurement is a highly accurate and reliable technique used to measure liquid levels in various industrial applications. This method relies on the principle of magnetostriction, which involves the change in shape or dimensions of a material in response to a magnetic field. Here's how magnetostrictive level measurement works:

1. Probe Construction:

   • The primary component of a magnetostrictive level measurement system is a probe or sensor, typically made of a magnetostrictive wire.
   • The probe is inserted into the liquid-filled tank vertically, with one end securely anchored at the top of the tank and the other end extending down to the bottom.

2. Principle of Operation:

   • A pulse of electrical current is sent down the magnetostrictive wire, generating a magnetic field around the wire.
   • Simultaneously, a magnetic float containing a permanent magnet is positioned around the probe and allowed to float on the liquid's surface.
   • When the pulse of current reaches the float's magnet, it induces a torsional strain in the magnetostrictive wire.
   • This torsional strain causes the wire to twist slightly, generating a torsional wave that travels along the wire at the speed of sound.

3. Measurement Process:

   • As the torsional wave travels along the wire, it encounters the point where the float's magnet is positioned.
   • At this point, the torsional wave induces a return pulse in the wire, which travels back to the probe's electronics.
   • By measuring the time it takes for the return pulse to arrive at the probe's electronics, the system calculates the distance from the top of the tank to the float, which corresponds to the liquid level.

4. Output and Display:

   • The calculated liquid level is typically converted into an analog or digital signal proportional to the tank's liquid level.
   • This signal can be displayed on a local indicator or transmitted to a remote monitoring or control system for further processing and visualization.

5. Advantages of Magnetostrictive Level Measurement:

   • High accuracy and repeatability.
   • Suitable for a wide range of liquids, including corrosive and abrasive substances.
   • Minimal maintenance requirements.
   • Ability to measure multiple levels simultaneously in multi-compartment tanks.
   • Immunity to temperature variations and changes in liquid properties.

6. Applications:

   • Magnetostrictive level measurement is commonly used in industries such as petroleum, chemical processing, food and beverage, pharmaceuticals, water and wastewater treatment, and storage terminals.
   • It is particularly well-suited for applications requiring precise level control, inventory management, and safety compliance.

Overall, magnetostrictive level measurement offers a robust and accurate solution for liquid level monitoring in various industrial settings, providing real-time data to optimize processes, ensure safety, and minimize downtime.