In this PPt u will see 1.Introduction 2.principle 3.construction 4.working 5.advantages and disadvantages 6.application about bourden pressure gauge

1. BOURDON PRESSURE GAUGE

2. The Bourdon tube is the namesake of Eugéne
Bourdon, a French watchmaker and engineer who
invented the Bourdon gauge in 1849. Over the
years, the Bourdon tube has entrenched itself as
the elastic element in most pressure gauges in
application today.
The Bourdon pressure gauge operates on the
principle that, when pressurized, a flattened tube
tends to straighten or regain its circular form in
cross-section.

3. WORKING
PRINCIPLE
When an elastic transducer ( bourdon
tube in this case ) is subjected to a
pressure, it defects. This deflection is
proportional to the applied pressure when
calibrated.

4. TYPES OF BOURDON TUBE

5. CONSTRUCTION
As seen in the figure, the pressure input
is given to a socket which is soldered to
the tube at the base. The other end or free
end of the device is sealed by a tip. This tip
is connected to a segmental lever through
an adjustable length link. The lever length
may also be adjustable. The segmental
lever is suitably pivoted and the spindle
holds the pointer as shown in the figure. A
hair spring is sometimes used to fasten the
spindle of the frame of the instrument to
provide necessary tension for proper
meshing of the gear teeth and thereby
freeing the system from the backlash. Any
error due to friction in the spindle bearings
is known as lost motion. The mechanical
construction has to be highly accurate in
the case of a Bourdon Tube Gauge. If we
consider a cross-section of the tube, its
outer edge will have a larger surface than

6. WORKING :-
The pressure to be measured is connected to the fixed open
end of the bourdon tube. The applied pressure acts on the
inner walls of the bourdon tube. Due to the applied pressure,
the bourdon tube tends to change in cross – section from
elliptical to circular. This tends to straighten the bourdon tube
causing a displacement of the free end of the bourdon tube.
This displacement of the free closed end of the bourdon tube
is proportional to the applied pressure. As the free end of the
bourdon tube is connected to a link – section – pinion
arrangement, the displacement is amplified and converted to
a rotary motion of the pinion. As the pinion rotates, it makes
the pointer to assume a new position on a pressure calibrated
scale to indicate the applied pressure directly. As the
pressure in the case containing the bourdon tube is usually
atmospheric, the pointer indicates gauge pressure. Operation
of Bourdon tube

8. ADVANTAGES:-
These Bourdon tube pressure gauges
give accurate results.
Bourdon tube cost low.
Bourdon tube are simple in
construction.
They can be modified to give electrical
outputs.
They are safe even for high pressure
measurement.
Accuracy is high especially at high

9. LIMITATIONS:-
They respond slowly to changs in
pressure
they are subjected to hysterisis.
They are sensitive to shocks and
vibrations.
Ampilification is a must as the
displacement of the free end of the
bourdon tube is low.
It cannot be used for precision
measurement.

10. SUBMITTED BY:-
KRISHNAKANT NAYAK
2016UCH1239
MNIT,JAIPUR