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TRANSDUCERS & ITS
INDUSTRIAL APPLICATIONS
PRESENTED BY
AJAY KUMAR
ROLL NO. 1305232005
E.I ,III YEAR
TYPES OF TRANSDUCERS
PRESSURE MEASUREMENT
TEMPERATURE MEASUREMENT
FLOW MEASUREMENT
FlOW MEASUREMENT
• ORIFICE PLATE
• VENTURI TUBE
• ROTAMETER
Differential Pressure Flowmeters
The Orifice Plate
• The orifice plate is the simplest and cheapest. It is
simply a plate with a hole of specified size and
position cut in it, which can then clamped between
flanges in a pipeline
• The increase that occurs in the velocity of a fluid as it
passes through the hole in the plate results in a
pressure drop being developed across the plate.
• After passing through this restriction, the fluid flow jet
continues to contract until a minimum diameter
known as the vena contracta is reached.
The Venturi Tube
• The classical or Herschel Venturi tube is the oldest type of differential pressure
flowmeter (1887).
• The restriction is introduced into the flow in a more gradual way
• The resulting flow through a Venturi tube is closer to that predicted in theory so
the discharge coefficient C is much nearer unity (0.95).
• The pressure loss caused by the Venturi tube is lower, but the differential pressure
is also lower than for an orifice plate of the same diameter ratio.
• The smooth design of the Venturi tube means that it is less
sensitive to erosion than the orifice plate, and thus more
suitable for use with dirty gases or liquids.
• The Venturi tube is also less sensitive to upstream
disturbances, and therefore needs shorter lengths of straight
pipework upstream of the meter than the equivalent orifice
plate or nozzle.
• Like the orifice plate and nozzle, the design, installation, and
use of the Venturi tube is covered by a number of
international standards.
• The disadvantages of the Venturi tube flowmeter are its size
and cost.
The Venturi Tube
AJAY CHAUHAN seminar ppt original
AJAY CHAUHAN seminar ppt original

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AJAY CHAUHAN seminar ppt original

  • 1. TRANSDUCERS & ITS INDUSTRIAL APPLICATIONS PRESENTED BY AJAY KUMAR ROLL NO. 1305232005 E.I ,III YEAR
  • 2.
  • 3. TYPES OF TRANSDUCERS PRESSURE MEASUREMENT TEMPERATURE MEASUREMENT FLOW MEASUREMENT
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
  • 9.
  • 10.
  • 11.
  • 12.
  • 13.
  • 14. FlOW MEASUREMENT • ORIFICE PLATE • VENTURI TUBE • ROTAMETER
  • 15. Differential Pressure Flowmeters The Orifice Plate • The orifice plate is the simplest and cheapest. It is simply a plate with a hole of specified size and position cut in it, which can then clamped between flanges in a pipeline • The increase that occurs in the velocity of a fluid as it passes through the hole in the plate results in a pressure drop being developed across the plate. • After passing through this restriction, the fluid flow jet continues to contract until a minimum diameter known as the vena contracta is reached.
  • 16.
  • 17. The Venturi Tube • The classical or Herschel Venturi tube is the oldest type of differential pressure flowmeter (1887). • The restriction is introduced into the flow in a more gradual way • The resulting flow through a Venturi tube is closer to that predicted in theory so the discharge coefficient C is much nearer unity (0.95). • The pressure loss caused by the Venturi tube is lower, but the differential pressure is also lower than for an orifice plate of the same diameter ratio.
  • 18. • The smooth design of the Venturi tube means that it is less sensitive to erosion than the orifice plate, and thus more suitable for use with dirty gases or liquids. • The Venturi tube is also less sensitive to upstream disturbances, and therefore needs shorter lengths of straight pipework upstream of the meter than the equivalent orifice plate or nozzle. • Like the orifice plate and nozzle, the design, installation, and use of the Venturi tube is covered by a number of international standards. • The disadvantages of the Venturi tube flowmeter are its size and cost. The Venturi Tube