Indicating elements for pressure gages:
• Various forms of industrial pressure gages differ mainly in the
method by which ...
Torque –Tube Shaft:
(Differential pressure meter)
Torque tube shaft:
• It operates by mechanical means.
• A torque tube system is a driveshaft technology, often used in
aut...
Description :
• The outer tube is made from relatively thin-metal tubing and is
clamped rigidly to the meter housing.
• Th...
ELECTRICAL TYPES:
• Electrical means are also used for transmitting motion of the float, bell,
or bellows of the different...
Inductance coil-system:
(Differential-pressure-meter)
• An induction coil or "spark coil" is a type of electrical transfor...
Armature:
• An armature generally refers to one of the two principal electrical components of an
electromechanical machine...
Inductance-bridge pressure differential meter:
Description:
• The float in leg of the manometer supports an armature on the inside of a non-
magnetic tube.
• This tube s...
Working:
• When the armature at the transmitter moves to a new position, the reactance at the
side of the transmitter coil...
Uses:
• Variations of voltage have no effect on the calibration of the system.
• The meter is completely sealed.
VARIATION...
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Pressure meters

pressure gauge
Published on: Mar 4, 2016
Published in: Engineering      
Source: www.slideshare.net


Transcripts - Pressure meters

  • 1. Indicating elements for pressure gages: • Various forms of industrial pressure gages differ mainly in the method by which the displacement of the measuring element is arranged to operate an indicating point. • Mechanical and Electrical means can be used for transmitting motion of the float, bell or bellows of differential pressure meters.
  • 2. Torque –Tube Shaft: (Differential pressure meter)
  • 3. Torque tube shaft: • It operates by mechanical means. • A torque tube system is a driveshaft technology, often used in automobiles with a front engine and rear drive. • Driveshaft's are sometimes also used for other vehicles and machinery. • The "torque tube" transmits traction force by directly coupling the axle differential to the transmission.
  • 4. Description : • The outer tube is made from relatively thin-metal tubing and is clamped rigidly to the meter housing. • The inner shaft is rigid and the force of the bellows causes the free end of the torque tube to twist. • The inner shaft then rotates in the same direction. • The torque tube also serves as a spring. • This torque tube shaft is often employed in bellows meter.
  • 5. ELECTRICAL TYPES: • Electrical means are also used for transmitting motion of the float, bell, or bellows of the differential-pressure-meter. • Electronic pressure transmitters convert input pressure into a digital or electrical signal. • Electrical type includes:  Inductance-coil-system  Resistance-rod-system  Magnetic-clutch
  • 6. Inductance coil-system: (Differential-pressure-meter) • An induction coil or "spark coil" is a type of electrical transformer used to produce high-voltage pulses from a low-voltage direct current (DC) supply. • The term 'induction coil' is also used for a coil carrying high-frequency alternating current (AC), producing eddy currents to heat objects placed in the interior of the coil.
  • 7. Armature: • An armature generally refers to one of the two principal electrical components of an electromechanical machine — generally in a motor or generator. • In the armature, an electromotive force is created by the relative motion of the armature and the field. • Inductance-coil-system and armature are used in Differential pressure meter like Inductance Bridge pressure differential meter.
  • 8. Inductance-bridge pressure differential meter:
  • 9. Description: • The float in leg of the manometer supports an armature on the inside of a non- magnetic tube. • This tube seals the float side of the manometer. • A divided inductance coil fixed in position on the outside of the tube. • The instrument contains an identical divided inductance coil, in which a counter balanced armature is suspended. • At balance, the armatures are similarly placed in each coil and current flow through each coil is same.
  • 10. Working: • When the armature at the transmitter moves to a new position, the reactance at the side of the transmitter coil differs. • This difference causes a different current flow in each arm of the circuit. • The magnetic field at the receiver coil is redistributed and the net force acts on the armature, tending to bring the system to balance. • Therefore, for every position of armature in the transmitter there is a corresponding position in the receiver armature. • The motion of the float is transmitted to the receiver point.
  • 11. Uses: • Variations of voltage have no effect on the calibration of the system. • The meter is completely sealed. VARIATIONS: • The variation of the inductance-coil is employed in which the balance of the bridge is detected by a galvanometer. • A reversible electric motor is used to position the receiver armature in the coil. • A second variation of the inductance-coil system employs an electronic amplifier for detecting balance and a reversible electric motor for positioning the receiver armature.

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