Magnetostrictive Level Transmitter
Magnetostrictive level transmitter is similar to float type sensors in that a permanent magnet sealed inside a float travels up and down a stem in which a magnetostrictive wire is sealed. These transducer requires the proper choice of float based on the specific gravity of the liquid.When choosing float and stem materials for magnetostrictive level transmitter, the same guidelines described for magnetic and mechanical float level sensors apply.Magnetostrictive level and position devices charge the magnetostrictive wire with electrical current, when the field intersects the floats' magnetic field a mechanical twist or pulse is generated, this travels back down the wire at the speed of sound, like ultrasound or radar the distance is measured by time of flight from pulse to return pulse registry. The time of flight corresponds to the distance from the transducer detecting the return pulse.
Because of the accuracy possible with the magnetostrictive technique, it is popular for “custody-transfer” applications. It can be permitted by an agency of weights and measures for conducting commercial transactions. It is also frequently applied on magnetic sight gages. In this variation, the magnet is installed in a float that travels inside a gage glass or tube. The magnet operates on the transducer which is mounted externally on the gage. Boilers and other high temperature or pressure applications take advantage of this performance quality.
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