![]() ![]() It states that the total energy of the fluid as it enters the system is equal to the total energy as it leaves. In the following you can find, summarized description of each flowmeter inclusive of measuring principle, accuracy, rangeability, advantages, disadvantages, installation requirements and best applications.ĭifferential pressure flowmeters, measure the flow rate based on Bernoulli's Law.ĭaniel Bernoulli, a Swiss mathematician and physicist, published Bernoulli's principle in his book, Hydrodynamica, in 1738.īernoulli's principle states that, decrease of pressure or potential energy of a fluid in a closed system, causes an increase in fluid velocity.īernoulli's principle can be derived from the principle of conservation of energy. ![]() Most common flow instruments of each category which will be described respectively are listed below: Differential Pressure (Head) TypeĪs you see there are various types of flow measuring devices that may complicates the selection of appropriate device. Flow Measurement Instruments Various Units of Flow Measurementįlow is measured as a quantity (either volume or mass) per unit time.įlow meters are divided into three categories, based on measuring principle:
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