Level Troll
Level troll is an instrument used to measure level of closed tanks. Instrument contain a displacer, dipped in a vessel. The displacer will move up and down with liquid level in the vessel / tank.
This instrument works under the Archimedes principle. the liquid in the vessel will act an upward force to the displacer (Buoyancy Force). this force will help to move upward. Buoyancy force depends up on density of liquid.
Buoyancy Force= Volume of displacer X Density of liquid
A tape is attached to the displacer to a torque arm. Measured torque will covert into electric form (4 to 20 mA).
Two types of calibrations
- Wet calibration
- Dry calibration
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