The rotating vane anemometer is useful for measuring what?

The rotating vane anemometer is useful for measuring what?

• A. The airflow through large supply and exhaust openings where the air velocities are relatively high
• B. Small air velocities near zero
• C. Temperature
• D. Humidity

Answer: (A)

Rotating vane anemometers measure air velocity. The device has a small vane or propeller that spins as air flows past it, and the rotation rate is proportional to the wind speed. This makes them especially useful for measuring relatively high-velocity air streams entering or leaving large openings, such as supply and exhaust openings in HVAC systems. They read velocity directly from the rotation rate, which is convenient for ductwork with larger openings and faster flows. They aren’t ideal for very low air velocities near zero, where the vane may not spin reliably. Temperature and humidity are different properties and require separate sensors, not a rotating vane. So for assessing high-velocity flows through large openings, this instrument is the best fit.

Rotating vane anemometers measure air velocity. The device has a small vane or propeller that spins as air flows past it, and the rotation rate is proportional to the wind speed. This makes them especially useful for measuring relatively high-velocity air streams entering or leaving large openings, such as supply and exhaust openings in HVAC systems. They read velocity directly from the rotation rate, which is convenient for ductwork with larger openings and faster flows.

They aren’t ideal for very low air velocities near zero, where the vane may not spin reliably. Temperature and humidity are different properties and require separate sensors, not a rotating vane. So for assessing high-velocity flows through large openings, this instrument is the best fit.