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 The
device consists of a magnetostrictive wire in the stem and a permanent
magnet inside the float. The float is the only moving part that
travels vertically on the stem. Once a pulse current is induced
from the end of the magnetostrictive wire, a tubular magnetic
field emanates. As the float travels, torsional vibration is launched
by the interaction between the float magnetic field and the magnetostrictive
wire. The float position is determined by measuring the lapse
of time from the launching of the torsional vibration to the return
of the signal.
Magnostrictive Level Technology
Advantages:
-
Limited motion
- Few
moving parts
- Can
measure interface
Magnostrictive Level Technology
Disadvantages:
- Calibration
changes with density
- Build-up
on float can cause calibration shift
- High
cost with long spans
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