Which device measures the flow rate and/or total flow of fluid flowing through a pipe?

Which device measures the flow rate and/or total flow of fluid flowing through a pipe?

• A. Flow meter
• B. Pressure gauge
• C. Flow switch
• D. Thermostatic mixing valve

Answer: (A)

Measuring how much fluid is moving through a pipe, and how much has moved over time, is done with a flow meter. It provides the instantaneous flow rate (volume per time) and, in many designs, also accumulates totalized flow so you can see the cumulative volume. This makes it the appropriate choice for monitoring usage, pump performance, and process control. A pressure gauge, by contrast, only shows pressure and doesn’t quantify flow rate or total flow. A flow switch detects whether flow is present or not or triggers at a set threshold, but it doesn’t provide a continuous measurement. A thermostatic mixing valve blends hot and cold water to control temperature and does not measure flow.

Measuring how much fluid is moving through a pipe, and how much has moved over time, is done with a flow meter. It provides the instantaneous flow rate (volume per time) and, in many designs, also accumulates totalized flow so you can see the cumulative volume. This makes it the appropriate choice for monitoring usage, pump performance, and process control.

A pressure gauge, by contrast, only shows pressure and doesn’t quantify flow rate or total flow. A flow switch detects whether flow is present or not or triggers at a set threshold, but it doesn’t provide a continuous measurement. A thermostatic mixing valve blends hot and cold water to control temperature and does not measure flow.