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Pressure Measurement - Bourdon Tube Pressure Guage.

Bourden Gauge - A instrument use to measure the pressure.

on 13 October 2015

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Transcript of Pressure Measurement - Bourdon Tube Pressure Guage.

Definition Of Pressure
Pressure measurement devices
1) Mechanical
U-tube manometer
Bourdon tube
Diaphragm and Bellows
Helix and Spiral Tubes
Single and Double inverted bell

2) Electrical
Strain Gauge
Capacitive sensor
Resonant Wire

Basic principle of bourden tube pressure gauge
The Bourdon pressure gauge uses the principle that a flattened tube tends to straighten or regain its circular form in cross-section when pressurized.

When a bourden tube is subjected to pressure, it defects. This deflection is directly proportional to the applied pressure when calibrated.
Operation of Bourden Tube
Advantages of Bourdon Pressure Gauge
Accurate results.

Low cost.

Simple in construction.

They can be modified to give electrical outputs.

They are safe even in measuring high pressure.
Limitations of Bourdon Pressure Gauge
They respond slowly to changes in pressure.

They are subjected to hysteresis.

They are sensitive to shocks and vibrations.

Amplification is must as the displacement of the free end of the bourden tube is low.

It cannot be used for precision measurements.
Pressure Measurement.
Bourdon pressure gauge.
Absolute pressure
is zero-referenced against a perfect vacuum, using an absolute scale, so it is equal to gauge pressure plus atmospheric pressure.

Gauge pressure
is zero-referenced against ambient air pressure, so it is equal to absolute pressure minus atmospheric pressure.

Differential pressure
is the difference in pressure between two points.
Bourdon tube pressure gauges are aneroid type of pressure gauges.

They are the most common type in many areas and are used to measure medium to high pressures.

They cover measuring spans from 600 mbar to 4,000 bar.

The measuring element is a curved tube with a circular, spiral or coiled shape, commonly called a bourdon tube.
The pressure to be measured is connected to the open end of the bourden tube.
The applied pressure acts on the inner wall of the bourden tube.

Due to the applied pressure, the bourden tube tends to change its cross section from circular to eliptical.

This tends to straighten the bourden tube causing the displacement of the free end of the bourden tube.
The displacement of the free end of the bourden tube is proportional to the applied pressure.

As the free end of the bourden tube is connected to a link-section-pinion arrangement, the displacement is amplified and converted to the rotary motion of the pinion.
As the pinion rotates, it makes the pointer to assume a new position on the pressure calibrated scale to indicate the applied pressure directly.

The pressure inside the case containing the bourden tube is generally the atmospheric and the the pointer indicates the gauge pressure.
Types of Bourden Tube Pressure Gauge
(a) C-type tube. (b) Spiral tube. (c) Helical tube.
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