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Primary flow element. A primary flow element is the element of a flow meter that serves to indicate the quantity or velocity of flow. For example, in the case of an orifice flow meter, the differential pressure across the orifice plate is the primary flow element.
The primary sensing device 10 is depicted in FIG. 5 as installed, e.g., with a fluid carrying conduit within which the rate of flow of a fluid is to be measured and, due to the energy transmitted by the moving fluid to the tensioned reed 12, a harmonic wave pattern is set up within the reed 12.