Monday, April 23, 2018

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Explain the working principle of a leveltrol.


 The leveltrol is used for measuring level of liquids in a closed vessel.

1.    PRINCIPLE. : It works on Archimedes principle "The loss in weight of a body immersed in a liquid is equal to amount of liquid displaced by the body". The leveltrol basically consists of the following :

2.    DISPLACER : It is consists of a cylindrical shape pipe sealed and filled inside with sand or some weight. The purpose of this is to convert change in level to primary motion. The variation in buoyancy resulting from a change in liquid level varies the net weight of the displacer increasing or decreasing the load on the torque arm. This change is directly proportional to change in level and specific gravity of the liquid.

3.    RELAY : Amplifies pressure variations at the nozzles.      

4.    REVERSING ARC : It is used for the following purposes.
•    Motion take of from Torque tube.
•    Means of reverse control action.
•    Adjustment for specific gravity.

5.    PROPERTIONAL UNIT. : Converts primary motion to a proportional output air pressure.

6.    CONTROL SETTING UNIT : Provides a motions of varying the set point.

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