By measuring the different heights of liquid on the left and the right hand side of the U-tube it is possible to calculate the pressure from the outside source in relation to atmospheric pressure.A differential U-tube is closed and both ends are filled with different liquid/gas at different pressures. Example of an inclined manometer that’s available to buy (source: A manometer gauge is an extremely basic but very effective device which is used to measure pressure. The differential pressure can be written by the equation, p1-p2 = dm.h.Cosb (1+a2/a1) The height of the mercury column would rise and fall in tandem with differing atmospheric pressure. In the majority of cases this will relate to a gauge which consists of a U-shaped glass tube which is filled with As the manometer pressure gauge has no mechanical parts it requires minimal maintenance and is extremely accurate.The principle behind a manometer gas or liquid pressure gauge is extremely simple. As a consequence the level of the liquid on the left-hand side will be the same as the level of the liquid on the right-hand side – equilibrium. As a consequence, the liquid will be pushed down on one side with the greater pressure causing the liquid to rise on the side with the lesser pressure. Liquid is introduced to the U-tube at either end with a volume of air separating the different liquids. As the name refers to, a U-tube manometer is made up of two parallel tubes joined together in the form of the letter “U.” The two parallel tubes basically constitute the limbs of the device. All Rights Reserved. No moving parts, no maintenance and extremely accurate readings – what more could you ask for?By using this website you agree to our Cookies usage and Data Transfer in and outside of the EU. Inclined Tube Manometer. One of the most common is the water filled u-tube manometer used to measure pressure difference in pitot or orifices located in the airflow in air handling or ventilation system. However we will focus on the five basic types which are:The traditional U-Tube device is the most common with one end of the partially liquid filled tube open to the atmosphere and the other connected to an outside source. This is done to expand the scale and thereby to increase the sensitivity. For example, if both ends of the U-tube are left open to the atmosphere then the pressure on each side will be equal. Copyright © 2020 Bright Hub PM. U-tube manometer working principle If the pressure from the additional gas/liquid supply is greater than the atmospheric pressure this will exert a downward pressure on the measuring liquid. We and our partners operate globally and use cookies, including for analytics, personalisation, ads and Newsletters: The use of a tap allows air to be expelled from or admitted into the inverted U-tube device. If we look at the original mercury barometers they were simply a glass tube filled with the mercury and part-vacuum. As a consequence, the liquid will be pushed down on one side with the greater pressure causing the liquid to rise on the side with the lesser pressure.

However, if the weight or the pressure exerted on one end of the see-saw is greater than the other, the heavier side will lower and the lighter side will rise.There are many variants on the market. Thereby adjusting the pressure difference and giving an accurate readingThe micro-design is a modified version of the basic U-tube except one side of the tube has a larger cross-section. This tends to be used where the pressure needs to be measured directly, not based on an outside pressure.The inverted U-tube design is used to measure low-pressure between two separate points to a relatively high level of accuracy. In this instance the liquid would fall on the side of the open section of the U-tube and rise on the side connected to the additional gas/liquid supply.Perhaps the easiest way to explain this is the movement of a playground see-saw.

There are various types which allow you to adjust the pressure on one side to give a more accurate reading. The manometer contains manometric fluid such as Mercury with specific gravity of 13.3. The main point being that the tube was one column and both ends were closed.A liquid manometer in comparison to a mercury barometer, showing the difference in working principleA manometer allows the measurement of additional liquid/gas sources against atmospheric pressure or against other liquid/gas sources.

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