What Is a Vane Anemometer?

Impeller anemometer is an instrument used to measure the speed of air flow. An impeller anemometer is generally composed of an impeller and a counting mechanism. The impeller anemometer can be divided into two types according to its counting mechanism: self-recording impeller anemometer and non-self-recording impeller anemometer. The general measurement range of the impeller anemometer is 0.5 10m / s.

The impeller anemometer is composed of an impeller and a calculation mechanism, as shown in Figure 1.

The impeller anemometer can be divided into two types according to its calculation mechanism: one is an internal timing device that can directly read the wind speed (m / min), which is called a self-recording impeller anemometer. This instrument has a red timing hand on the left side of the dial It takes 120 seconds to complete a lap (the first 30 seconds and the last 30 seconds are the preparation and closing time respectively, and the actual counting time is only 60 seconds). Therefore, the reading at this time is the wind speed per minute; some have been converted in the counting mechanism so that the obtained wind speed is the wind speed per second. The other is without a timing device, and a stopwatch must be prepared when using it. It is said that it does not remember the impeller anemometer. ^[2]

When not using the self-reporting impeller anemometer, the anemometer switch should be turned off and the original reading of the anemometer pointer should be recorded. Then the anemometer is placed on the selected measuring point so that the surface of the anemometer is perpendicular to the airflow. Direction, turn for a few minutes, when the anemometer impeller turns stable, turn on the anemometer switch and the stopwatch at the same time, and after a certain time (about one minute), turn them off at the same time, and then according to the anemometer reading and the stopwatch Time to calculate the wind speed. ^[2]

Due to the inertia and mechanical friction of the instrument itself, the anemometer pointer readings may not reflect the actual air velocity. Therefore, after obtaining the air velocity from the above formula, it must be corrected according to the anemometer calibration curve.

Before the impeller anemometer is used, it must be calibrated with an air cylinder or intercalibrated with the calibrated impeller anemometer.

The impeller anemometer measures wind speed in the range of 0.5 to 10 meters per second. The more precise impeller anemometer is only suitable for measuring wind speed in the range of 0.3 to 5.0 meters per second. Because the measured wind speed is large, the blade is easily damaged and bent. ^[2]

Sensitive and accurate

2.Separate fan, can be read while measuring

3. Low current consumption (6mA)

4.Ergonomic, easy to use

5. Large LCD display, easy to read.

6.Reading can be locked