Pressure Gauge
Pressure is defined as the normal force exerted by a fluid per unit area of the surface. This pressure can be measured with various techniques using different types of devices. In case of fluid mechanics, we use some specific pressure gauges for measurement of pressure. Selection of pressure gauges depends upon the location and type of fluid flow. We will further discuss various types of pressure devices which we use nowadays for measuring fluid pressure in pipes, open channel and also discuss the techniques of measuring atmospheric pressure and pressure gauges which helps in measurement of atmospheric pressure.
Manometer
Manometers are the simple type of pressure measuring devices which works on the principle of balancing the column of liquid with the same or some another column of liquid. In this using one column we measure the pressure irrespective of the second column. It has further two types.
§ Simple Manometers
§ Differential Manometers
Mechanical Gauge
Mechanical gauges are used to measure very high pressure but having less accuracy. All the mechanical gauges consist of an elastic element which gets deformed on application of pressure. This deformation is further magnified by gear and pinion arrangement to a pointer scale and the pressure is measured. Following are the most commonly used pressure gauges.
-Bourdon Tube pressure gauge
-Diaphragm pressure gauge
-Bellows pressure gauge