In a DP flow measurement, what role does the plate perform?

• A. Divides the flow
• B. Measures concentration
• C. Filters impurities
• D. Changes the fluid temperature

Answer: (A)

In a DP flow measurement, the plate’s job is to act as a restriction in the flow path. By narrowing the flow area, fluid must accelerate around the plate, creating a drop in static pressure from upstream to downstream. That pressure difference is what a differential-pressure transmitter reads, and it’s this differential that’s related to how much fluid is moving. So the plate effectively divides and constricts the flow to generate the measurable differential required to calculate flow rate.

The other options aren’t what the plate does here: it isn’t measuring concentration, filtering impurities, or changing the fluid’s temperature.