Manometers are one of the oldest type of pressure measurement.
Manometers can be used to measure gauge pressure,differential pressure and absolute pressure.
Various types of Manometers
1.U tube Manometer
2.Well type or reservoir manometer
4.Float type manometer
U tube Manometer.
U tube is made of glass.The tube is filled with a fluid known as Manometer fluid.
Manometer fluid may be mercury , water etc…
If the manometer is connected to same pressure source (P1 = P2) the level of the manometer will be same.
If the manometer is connected to two different pressure source there will be a difference in level of the manometer fluid in both the limps.
If P1>P2 the differential pressure P2-P1=@h
@=density of the fluid
While choosing the manometer fluid for a particular application we need to remember following things.
Manometer fluid should not wet the wall
Manometer fluid should not absorb gas
Manometer fluid should not react chemically
Manometer fluid should have low vapor pressure