Pressure gauge
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The manometers, those ingenious and essential devices in measuring pressure in fluids, whether liquids or gases, play a critical role in closed loop systems. Its main function is to calculate the difference between the real force exerted by the fluid and the surrounding atmospheric pressure. This difference is known as “gauge force”. Therefore, These instruments are sometimes called “Force Gauges”, since that is precisely what they measure.
The key concept here lies in the comparison between the external atmospheric pressure, namely, the pressure of the surrounding atmosphere, and the pressure inside the circuit through which the fluid in question flows. It is this relationship that gives manometers their ability to measure relative pressure., namely, pressure in relation to atmospheric.
Gauge pressure, therefore, is the value that precisely represents this relative pressure with respect to atmospheric pressure. It is important to note that the gauge pressure is considered positive when the pressures in the system are above atmospheric pressure., while it becomes negative when pressures fall below said reference value.
Finally, It is worth mentioning that the absolute pressure, which is a fundamental figure in measuring pressure, It is calculated by adding the gauge pressure to the atmospheric pressure. This addition of values provides a comprehensive measurement that takes into account both gauge force and ambient pressure., resulting in more complete and accurate information in pressure measurement applications. In summary, Manometers are essential tools for understanding and evaluating pressure in various contexts, providing a detailed understanding of how the internal pressure of a system relates to the surrounding atmosphere.
