1.SENSORS
*Sensors that are used in measuring the pressure of a fluid are called pressure transducers.
*A transducer is a device that being activated by energy from the fluid system, and in itself responds in a manner related to the magnitude of the applied pressure.
*The essential feature of pressure transducer is the elastic element which converts the signal from the pressure displacement.
2. BOURDAN GAUGE
*The bourdan gauge is a mechanical pressure measurement device.
*That relies on a circular arc of elliptical cross-section tube closed at one end, changing shape to circular cross-section under the action of fluid pressure
3.BAROMETER
*This is used to measure the absolute pressure of the atmosphere.
*In a fluid at rest, the pressure at any two points in the same horizontal plane is the same. This means that the mercury will rise up the tube until the pressure due to the weight of mercury will just balance the atmospheric pressure,
4.PIEZOMETER TUBE
*This is the simplest form of manometer and is used for the mesurement of liquid pressure only.
*It consists of a transparent tube, one end of which is connected to the vessel containing the liquid while the other end is open to the atmosphere.
5.MANOMETERS
An instrument for measuring the pressure of a fluid, consisting of a tube filled with a liquid, the level of the liquid being determined by the fluid pressure and height of the liquid being indicated on a scale.
