The wedge flowmeter consists of a wedge-type primary flow element and a differential pressure transmitter. When fluid passes through the wedge restriction element, a differential pressure is generated upstream and downstream. For all fluids, over a wide flow range—even at very low Reynolds numbers down to 300—the flow rate is proportional to the square root of the differential pressure. The differential pressure transmitter converts the signal from the flow element into a standard 4–20 mA output or a flow indication value.