Hot wire anemometers require correctionsĭifferential Pressure: Differential pressure anemometers use a pitot tube to direct air flow to a precision pressure measuring instrument (manometer). Hot wire type sensors areīetter at low airflow measurements than other technologies, and are commonly applied to air velocities below 100 feet per minute because of their sensitivity. The current is proportional to an output voltage sent to a meter or display. Increases, the electrical current must also increase to maintain the temperature of the element. Air flowing past the wire has a cooling effect on the wire. Hot Wire: Hot wire anemometers use a very fine wire electrically heated up to some temperature above the ambient. It's moving, always faces into one of the cups rotating eliminating the need to face into the wind. As with vane anemometers, the cups rotate at a speed proportional to wind speed. Vane anemometers must be held into the direction of airflow to work properly.Ĭup: Consists of cups mounted at equal angles on horizontal arms. Vane anemometers measure airflow independent of the airĭensity making them ideal for many applications where measurement without the need for corrections is desired. As the air moves past the propeller it rotates at a speed proportional to wind speed. Vane: Uses a vertically mounted propeller. There are a number of technologies used with modern anemometers: In fact, any application in which the movement of air is a primary concern can benefit from a quality anemometer. However, anemometers are also critical instruments for applications such as balancing forced hot air HVAC systems, the analysis of ventilation systems, aerodynamics testing, and fume hood verification. Typically, anemometers are used with weather stations to determine the speed of wind. Air velocity meters, commonly called anemometers, are used to measure the speed and/or volume of air movement.
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