Abstract: Measurement unit, particularly for hydraulic ducts, that comprises at least one main duct that is provided with at least one intake section and at least one discharge section for a fluid. The unit comprises: at least one main flowmeter, for measuring the value of the flow-rate along the main duct within a first measurement range; at least one auxiliary flowmeter, for measuring the value of the flow-rate along an auxiliary duct within a second measurement range; at least one flow control element, that is arranged along the main duct, and that is selectively operated to divert the flow from the main duct to the auxiliary duct, which is arranged in parallel to the flow control element; at least one control and management unit that is operatively associated with the main flowmeter and the auxiliary flowmeter in order to acquire and elaborate, at a desired rate, the signal that corresponds to the detections of the main flowmeter and the auxiliary flowmeter.

Abstract: A device for detecting water leaks, which comprises an inlet and an outlet and can be installed along a main duct; the main duct can be crossed by a flow of liquid. The detection device comprises at least one bypass flowmeter, in order to measure the flow rate along at least one bypass duct arranged in parallel to the main duct. Along the main duct there are flow control elements, for diverting the flow toward the bypass duct; the flow control elements can be deactivated automatically when a predefined value of difference in pressure between the inlet and the outlet is exceeded.