Manometer
In this method the
pressure created by a column of liquid is used to balance the pressure to be
measured.
Pressure reading is the difference in height from the top of
the pressure column to the top of the vented column. Mercury is normally used
in manometers.
Types of manometers
Single leg manometer: It is used to measure
barometric pressure. It is a closed tube manometer with a vacuum on sealed
side. Pressure applied to open end forces liquid up into the sealed end. A barometer
when moved vertically indicates changes in elevation, becoming an altimeter.
U- Tube manometer: It is used to measure differential
pressure.
Inclined tube manometer (slant manometer): It is used
to provide greater reading accuracy through the use of a longer tube.
