Will a Rotameter Be Able to Measure a Vacuum: A Quick Answer

Rotameters, widely known as Variable Area Flowmeters, are popular instruments used to measure the flow rate of liquids and gases. Their design simplicity, reliability, and ease of maintenance have made them a staple in various industrial and laboratory applications. However, one frequently asked question among engineers and technicians is whether a rotameter can measure vacuum conditions effectively. In other words, can a rotameter provide accurate readings when dealing with flows under sub-atmospheric pressures? This article aims to deliver a detailed and factual explanation regarding the use of rotameters in vacuum measurement scenarios, exploring their principles, limitations, and alternatives where appropriate.
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