![]() Absolute pressure is referenced to the pressure in a vacuum, whereas gauge and differential pressures are referenced to another pressure such as the ambient atmospheric pressure or pressure in an adjacent vessel. ![]() There are three methods for measuring pressure: absolute, gauge, and differential. The SI unit for pressure is the Pascal (N/m2), but other common units of pressure include psi, atmospheres, bars, inches of mercury, millimeters of mercury. ![]() Pressure sensors are packaged with a scale that provides a method to convert to engineering units. Given the known area of the diaphragm, pressure can then be calculated. You can measure this force by detecting the amount of deflection on a diaphragm positioned inline with the fluid. Pressure is defined as force per unit area that a fluid exerts on its surroundings.
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