The Principle of all the Pressure Measuring Devices is almost the same in engineering, but for your convenience’s sake, you may divide it into the following two types of Devices.
01) TUBE GAUGE DEVICES
02) MECHANICAL GAUGE DEVICES
01) Piezometer Tube
02) Manometer
It is the simplest form of Manometer, used for measuring moderate pressure. It consists of a tube, which opens at one end to the Atmosphere.
In which, Liquid can rise freely without overflow. Hence the Height, to which the Liquid rises up in the Tube, gives the Pressure Head directly.
To find out the Pressure of a liquid flowing through a pipe, a Piezometer Tube is connected to the pipe.
The important care to be taken is that the Tube should not project inside the pipe beyond the surface, all the burrs and roughness near the hole must be removed and the edge of the hole should be rounded off.
A Piezometer Tube is not suitable for measuring Negative Pressure because Air will enter the pipe through the Tube.
It is the improved form of a Piezometer Tube. With the help of a Manometer, you can measure, High Pressure and Negative Pressure also.
It is the slightly improved form of Piezometer Tube for measuring High as well as Negative Pressure of Liquid.
It consists of a tube bent in a U-shape. One end of which is attached to the Gauge point and another is open to the Atmosphere.
Generally, Mercury which is 13.6 times heavier than Water is used as Liquid in a Simple Manometer.
Hence you can measure High Pressure also.
You can also call it the modified form of Manometer.
In which the cross-section area of the Left Limb is 100 times larger than that of the Right Limb.
So, A Micromanometer is used for measuring Low Pressure, where accuracy is much more important.
This Micromanometer is further divided into two types which are
A) Vertical Tube Micromanometer
B) Inclined Tube Micromanometer
The Inclined Tube Micromanometer is more sensitive than the Vertical Tube Micromanometer.
It is the Device used for measuring the difference in Pressures, between two points in a pipe. It can also be used in two different pipes.
A Differential Manometer, in its simplest form, consists of a U-tube, containing heavy liquid.
Its two ends are connected to the points, whose difference in Pressure is required to be found out.
It is a particular type of Differential Manometer, in which an inverted U-tube is used.
Hence this is used for measuring the difference between Low Pressures, where accuracy is the prime consideration.
It consists of an Inverted U-Tube. This contains a light Liquid whose two ends are connected to the point whose difference in Pressure is to be found.
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
Fluid Mechanics and Hydraulic Machines: Problems and Solutions
Hydraulic Design Tables for Pipelines, Sewers, and Drainage Lines
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