Bourdon tube pressure gauge

Bourdon tube pressure gauge Working, Advantages, and Disadvantages:

Bourdon tube pressure gauges are used for the measurement of relative pressures from 0.6bar to 1000bar. Bourdon tubes are radially formed tubes with an oval cross-section.

The pressure of the measuring medium acts on the inside of the tube and produces a motion in the non-clamped end of the tube. This motion is the measure of the pressure and is indicated via the movement.

They are classified as mechanical pressure measuring instruments and thus operate without any electrical power.


For higher pressures, Bourdon tubes with several super-imposed windings of the same angular diameter (helical tubes) or with a spiral coil in the one plane (spiral tubes) are used.

Bourdon tube pressure gauge Parts List:
  1. Dial
  2. Case
  3. Pointer
  4. Ring
  5. Window
  6. Seal
  7. Socket
  8. Blowout back
  9. Diaphragm
  10. Bourdon Tube
  11. Solid Case Front
Construction and Working of Bourdon Tube Pressure Gauge:

The figure shows C type bourdon tube pressure gauge. The gauge comprises a C-shaped tube having an oval cross-section. The tube is closed at one end and the pressure is applied through the other end which is open.

The tube is free for movement. When the tube is subjected to pressure it will try to occupy a circular cross-section which makes the closed-end move because of the increase in radius of C shape.

The movement of the free closed end is transmitted to the pointer through the mechanical link, gear sector, and pinion arrangement. The pointer will indicate pressure on a calibrated scale.

Helical, oval, spiral bourdon tubes are also used. they are fabricated from brass, phosphor bronze, beryllium, copper, Monel metal, etc.

Also Read: Construction and Working of Pyrometer Advantages of Bourdon Tube Pressure Gauge:

1. Simple in construction and cheaper in cost.
2. Good accuracy. 3. Available in a wide range.
4. Can be connected with a transducer. 5. Simple calibration possible with the help of a deadweight piston gauge.
6. Absolute, differential pressure and vacuum can be measured.

Disadvantages of Bourdon Tube Pressure Gauge:

1. Vibration and shock affect the reading adversely. 2. Slow response. 3. It cannot be used at extremely high pressure, over 1600kg/cm^2.

Application of Bourdon Tube Pressure Gauge:

1. The bourdon tube is used in an analog pressure meter.
2. It is used in many hydraulic systems.
3. It is used in foot pump to in indicate pressure developed.

Also Read: Jig and Fixture
Bourdon tube pressure gauge Bourdon tube pressure gauge Reviewed by Harish on May 02, 2021 Rating: 5

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