Air is measured using various instruments, primarily anemometers, to determine its flow and volume.
Anemometers: Key Instruments for Air Measurement
Anemometers are crucial for measuring air, and they come in different types, each with its specific applications. The two main technologies are vane and hot-wire anemometers.
Vane Anemometers
- Function: These anemometers are used to average air velocities.
- Applications: They are suitable for measuring air flow at:
- Filter banks
- Walk-in ducts
- Supply openings
Hot-Wire Anemometers
While the reference only mentions them, hot-wire anemometers are also vital:
- Function: Measure air velocity based on the cooling effect of airflow on a heated wire.
- Applications: Useful for precise measurements, especially in applications requiring sensitivity to small changes in air velocity.
Types of Air Measurements
Beyond just airflow, other properties of air can be measured:
- Airflow (Velocity): Measured using anemometers (vane, hot-wire).
- Air Volume: Can be calculated using airflow and the area of the duct or opening.
- Air Pressure: Measured using manometers.
- Humidity: Measured using hygrometers.
- Temperature: Measured using thermometers or temperature sensors.
In summary, air measurement depends on the specific property being measured. Anemometers are essential for airflow, while other instruments are used for pressure, humidity, and temperature.
