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An open (differential) mercury pressure gauge. A mercury pressure gauge is a type of manometer using mercury as the working fluid. The most basic form of this instrument is a U-shaped glass tube filled with mercury. More complex versions deal with very high pressure or have better means of filling with mercury.
A single-limb liquid-column manometer has a larger reservoir instead of one side of the U-tube and has a scale beside the narrower column. The column may be inclined to further amplify the liquid movement. Based on the use and structure, following types of manometers are used [20] Simple manometer; Micromanometer; Differential manometer
The pressure across the test piece is typically measured with a U tube manometer while, for increased sensitivity and accuracy, the pressure difference across the metering element is measured with an inclined manometer. One end of each manometer is connected to its respective plenum chamber while the other is open to the atmosphere.
The meter is "read" as a differential pressure head in centimeters or inches of water. The venturi meter and manometer is a common type of flow meter which can be used in many fluid applications to convert differential pressure heads into volumetric flow rate , linear fluid speed , or mass flow rate using Bernoulli's principle .
Simple Manometer Can measure negative presures too .A improved version of piezometer (fig is shown on the page ) 2. micro manometer more sensitive 3. inclined tube manometer micro manometer with inclined tube or simple manometer with inclined tube 4. Differential Manometer measure pressure difference between two pressure sources 5.
A flow of air through a venturi meter, showing the columns connected in a U-shape (a manometer) and partially filled with water.The meter is "read" as a differential pressure head in cm or inches of water and is equivalent to the difference in velocity head.
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