In this Lesson We will Cover the Following Topics:
1. What is a Bourdon Pressure Gauge
2. Types of Bourdon tube Pressure Gauge
3. Working principle of bourdon tube pressure gauge.
4. working of C-type bourdon Tube Pressure Gauge
5.Spiral type bourdon tube pressure gauge
6.Helical type bourdon tube pressure gauge
Now lets discuss these topics in detail:
1. What is a Bourdon Pressure Gauge
Bourdon Pressure Gauge consists of a tube bend into a coil or an arc.
The Bourdon tube Pressure Gauge uses Displacement distance to measure pressure.
2. Types of Bourdon tube Pressure Gauge
There are mainly three types of Bourdon tube
1. C Type Bourdon tube
2. Spiral Type Bourdon tube
3. Helical Type Bourdon tube
Where Greater Measurement sensitivity and resolution are required, Spiral and Helical tubes are used.
These both give a much greater deflection at the free end for a given Applied pressure.
3. Working principle of bourdon tube pressure gauge.
when the pressure is applied the tube straighten out until the difference in force is balanced by the elastic resistance of the material of the tube.
As the pressure in the tube increases the coil unwinds. A pointer connected to the end of the tube indicates the applied pressure.
( watch our youtube video for animation)
4. working of C-type bourdon Tube Pressure Gauge
A C-type bourdon tube is fabricated by flattening the side of a hollow tube and then bending the tube into the shape of a “C”.
One end of the tube is sealed and the other end is open and this open end in this fixed to a support base.
The sealed end of the tube is linked to a pivoted segment gear, meshed with a small gear to which a pointer is attached.
Under the pointer there is a scale reading, when pressure is applied the tube tends to straighten and the segment moves around its pivot rotating the gear and the pointer and shows the exact reading. This reading is directly proportional to the applied pressure.
One limitation of c type bourdon tube is the relatively small amount of tip movement.
5. Spiral type bourdon tube pressure gauge
The spiral type tube works under the same principle of c type but as applied pressure increases the spiral uncoils.
Because of the increased tip movement, mechanical amplification is not normally needed.
This results in an increase in sensitivity and accuracy because there is no lost motion from loose leaves or gears.
6.Helical type bourdon tube pressure gauge
A helical type bourdon tube provides greater tip movement than the spiral type.
High pressure helical types might have as many as 20 coils, while low pressure helical types might have two or three helical coils.
It allows the tip movement to be converted to a circular motion by installing is central shaft inside the helix along its axis.
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