Mechanical Gauges are the best instrument to measure High Fluid Pressure in hydraulics engineering, whereas Tube Gauge cannot be conveniently used.
The principle on which all Gauges work is almost the same.
Still, if you like to use tube gauges to measure fluid pressure, you can,
Read: Important Tube Gauges Which Are Used to Measure Fluid Pressure
Here in this post, you will find information on three important mechanical pressure gauges.
The Bourdon’s Tube Pressure Gauge is most suitable to measure the pressure of the fluid, above or below the Atmosphere Pressure.
So, in its simplest form consists of an elliptical tube, ABC bent into an arc of a circle.
This bent-up tube is connected to the fluid at C (an inlet of Fluid), and the pressurized fluid flows into the tube, as a result of the increased pressure, tends to straighten itself.
The tube tends to become circular as it is encased in a circular cover.
With the help of a simple Pinion and Sector arrangement, the elastic deformation of the Burdon’s tube rotates the Pointer.
This Pointer moves over a Calibrated Scale. This directly shows the Pressure.
This Pressure Gauge is also used to find out the Pressure of a Fluid, above or below Atmosphere Pressure.
Instead of Bourdon’s tube, a Corrugated Diaphragm is used; hence it is called Diaphragm Pressure Gauge.
When the Gauge is connected to the Fluid at C(an inlet of Fluid), causes some deformation of the Diaphragm due to fluid pressure.
With the help of some Pinion arrangement, the elastic deformation of the Diaphragm rotates the Pointer.
This Pointer moves over the Calibrated Scale. This directly shows the Pressure.
A Diaphragm Pressure Gauge is generally, used to measure relatively low pressure.
So, in its simplest form, consist of a Piston and a Cylinder of a known area and is connected to a Fluid by a Tube.
A Pressure Gauge, to be calibrated, is fitted on the other end of the tube.
By changing the Weight, on the Piston, the Pressure on the Fluid is calculated and marked on the Pointer.
Besides this information, you are suggested to read something more from below engineering books
So, Here you find the Best Engineering Resources for further details
To get the more details about the topic, I further recommended reading
To know the topic in detail, I recommend reading The Construction and Calibration of a New Type of Pressure Gauge, and Bristol’s Recording Gauge for Pressure and Vacuum
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