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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.
Usually digital pulses from the meter are integrated by a flow computer to calculate the flow based on the devices K factor, when using a mechanical (rotating) metering device, the pulse stream is usually supplied directly in a uniform manner to the computer on a continuous basis (pulsed voltage).