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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.
A typical meter/prover arrangement is shown in. Figure 1. Product flowing through the meter is routed. through the proving device before being returned to. the main flow line. Utilizing an arrangement of. valves, a pulse generator and gating devices. (detectors) a comparison of metered throughput to.