What are the characteristics of anemometer?
As the name suggests, an anemometer is an instrument that measures the velocity of air flow. There are many types of it, and the most commonly used one at meteorological stations is the wind cup anemometer;
It consists of three parabolic cone empty cups fixed at 120 ° to each other on a bracket to form the sensing part, and the concave surfaces of the empty cups all face in the same direction.
The entire sensing part is installed on a vertical rotating axis, and under the action of wind, the wind cup rotates around the axis at a speed proportional to the wind speed.
Another type of rotary anemometer is the propeller anemometer, which consists of an induction part composed of a three or four bladed propeller;
Install it at the front end of a wind vane so that it is always aligned with the direction of the wind. The blade rotates around a horizontal axis at a speed proportional to the wind speed.
Characteristics of anemometer:
1. Small size, minimal interference with the flow field;
2. Widely applicable.
It can be used not only for gases but also for liquids, and can be used in subsonic, transonic, and supersonic flows of gases.
3. High frequency response, up to 1MHz.
4. High measurement accuracy and good repeatability. The disadvantage of a dedicated anemometer is that the probe interferes with the flow field and the dedicated line is prone to breakage.
5. In addition to measuring average velocity, it can also measure pulsation values and turbulence flow; In addition to measuring unidirectional motion, it can also simultaneously measure velocity components in multiple directions.
6. Directly display volumetric flow rate. Enter the cross-sectional area of the pipeline to calculate the volumetric flow rate.
7. The instrument has the function of calculating the average value of time periods or multiple points, which is used to calculate the average flow rate.
8. Can display maximum and minimum values, with reading retention function.
9. Calculate the average value of multiple points/time periods, hold key, hold reading, with backlight.
10. Automatic shutdown function, protective cover, waterproof, dustproof, and impact resistant.
