What type of device is a flow nozzle classified as?

A flow nozzle is classified as a pressure differential measurement element because it operates by creating a drop in pressure, which can be measured to determine the flow rate of a fluid. When a fluid passes through the flow nozzle, it is accelerated as it flows through the constriction, resulting in a decrease in pressure at that point compared to the pressure before the nozzle. This pressure differential can then be correlated with the flow rate using principles from fluid dynamics.

Understanding pressure differential measurement is crucial in many applications, such as in turbines and piping systems, where monitoring flow is essential for operational efficiency and safety. The ability of a flow nozzle to provide accurate flow measurement while minimizing pressure loss makes it an effective tool within the category of pressure differential measurement elements.

Thus, the classification reflects its primary function and the principle of operation, confirming why this answer is correct.