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BY, B.Raveender Singh

LEVEL MEASUREMENT. BY, B.Raveender Singh. Level Measurement. CONTENTS Classification of level system Brief introduction to the methods Level switches Summary. Level Measurement. LEVEL SYSTEMS. ELECTRICAL TYPES. MECHANICAL METHODS. THERMAL TYPES.

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BY, B.Raveender Singh

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  1. LEVEL MEASUREMENT BY, B.Raveender Singh

  2. Level Measurement • CONTENTS • Classification of level system • Brief introduction to the methods • Level switches • Summary

  3. Level Measurement LEVEL SYSTEMS ELECTRICAL TYPES MECHANICAL METHODS THERMAL TYPES Classification of Level Measurement Systems:

  4. Level Measurement MECHANICAL METHODS HYDROSTATIC TYPE GAUGE/SIGHT GLASS DISPLACER TYPE FLOAT TYPE Classification of Mechanical Level Measurement Systems:

  5. Level Measurement GAUGE GLASS • Simplest of level indication • Direct level indication • For local display • Can also be used for closed/pressurized tanks

  6. Level Measurement Float Type Level Measurement: • Used mainly for open tanks local level indication. • Float and tape method is widely used. • Spherical floats are preferred . • Magnetic bond type ball float .

  7. Level Measurement Displacer Type : Principle of operation : Works on Archimedes Principleof Buoyancy It states that the resultant force of a fluid on a body immersed in it acts vertically upwards,which is equal to the weight of the liquid displaced.

  8. Level Measurement F V Vx Fg Theory Buoyancy Force F = (Vx * Ph*g) + (V-Vx )*PL *g V – Displacer volume Vx – Volume of medium displaced by displacer Ph – Average density of heavier medium. PL -- Average density of lighter medium. Fg-- Displacer body weight.

  9. Level Measurement Displacer Type : • Commercially named as Level Trol. • Torque tube forms the main transducting element. • Torque developed is converted to standard signal and transmitted to control room.

  10. Level Measurement Displacer Type : • Mainly used for remote level indication and control • Simple reliable and accurate. • Can be used for liquids which tends to solidify under atmospheric conditions. • Can be used at very high temperatures and pressures.

  11. Level Measurement Hydrostatic Type : Hydrostatic head is the force due to liquid weight above the reference line .It is exerted equally in all directions and independent of volume or shape of the vessel. Pressure P = p g h P – density h

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