Types of manometers

U tube manometer.
Enlarged manometer.
Well type manometer.
Inclined tube manometer.
Bourdon Gauge
Bellow pressure gauge

1. Types of Manometers

2. Introduction Pressure measurement is one of the most important measurement in continuous process industries. Manometers measure the unknown pressure by balancing against the gravitational force of liquid heads.

3. Manometer Manometer refers to the measurement of pressure by comparison to the hydraulic pressure produced by a column of liquid. With the help of manometer, we can measure comparatively high pressure and negative pressure also .

4. Types covered U tube manometer . Enlarged manometer. Well type manometer . Inclined tube manometer .

5. U tube manometer Simplest manometer. Used in the measurement of liquid or gas pressure. Both legs have same area. Manometric fluid of known specific gravity is used. Mercury is generally used as fluid.

6. Enlarged manometer In the enlarged-leg manometer, a2 is not negligible compared to a1. It has a float in the enlarged-leg which is utilized for indication or recording. The two legs can be changed for changing the measurement span.

7. Well type manometer One leg is a simple tube, other leg is a large well. For small displacement of liquid level in the well there will be a large change in the height of simple tube.

8. Inclined tube manometer It is slant manometer. The angle of measuring leg is about 10 ⁰. Inclination is done to improve the sensitivity . This manometer is used to measure very small pressure difference.

9. Bourdon Gauge Key concept: pressure difference across different areas of inner and outer surfaces causes crescent to flex

10. Bellow pressure gauge Bellow pressure gauge used a column of liquid such as water or the liquid metal mercury suspended by a vacuum . It use the sealed chamber as a reference pressure and are driven by the external pressure.

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