Pressure measuring instruments are instruments used to measure pressure in gases and liquids. Pressure is typically measured in units of force per unit of surface area. Many techniques have been developed for the measurement of pressure and vacuum. Instruments used to measure and display pressure in an integral unit are called pressure meters or pressure gauges or vacuum gauges. A manometer is a good example, as it uses the surface area and weight of a column of liquid to both measure and indicate pressure. Browse through this category for various pressure measuring instruments available in Zambian stores.
Pressure Measuring Devices| Fluid Mechanics
Instruments used to measure and display pressure mechanically are called pressure gauges, vacuum gauges or compound gauges (vacuum & pressure). The widely used Bourdon gauge is a mechanical device, which both measures and indicates and is probably the best known type of gauge.
Types of Pressure Gauges
There are two basic pressure types, absolute and gauge. Pressure measurements can be divided into three different categories: absolute pressure, gage pressure and differential pressure. Absolute pressure refers to the absolute value of the force per-unit-area exerted on a surface by a fluid.
A manometer is a device that we use to measure the pressure of the pipelines (can be of gas, water, liquid, etc.) Also, it is usually referred to as a U-shaped tube that is filled with a liquid.
Pressure is typically measured in units of force per unit of surface area ( P = F / A). In physical science the symbol for pressure is p and the SI unit for measuring pressure is pascal (symbol: Pa). One pascal is the force of one Newton per square meter acting perpendicular on a surface.
Types Of Pressure
The unit for a pressure gauge reading relative pressure is psi (pounds per square inch) or psi (pounds per square inch gauge).
A manometer can be designed to directly measure absolute pressure. The manometer in Figure 5 measures the pressure compared to zero absolute pressure in a sealed leg above a mercury column. The most common form of this manometer is the conventional mercury barometer used to measure atmospheric pressure.
Types of pressure sensors. These are:
Three different types of manometers:
The term gauge pressure is used when the pressure in the system is greater than the local atmospheric pressure. The gauge pressure scale was developed because almost all pressure gauges read zero when open to the atmosphere.