Analysis of causes of measurement errors in anemometers
Anemometer is still a relatively common device, but measurement errors often occur during our operation. Why does this situation occur? I believe many people may have this question. Today, the editor will explain to you that the main reasons for measurement errors in anemometers are as follows
1, Installation error
Due to the fact that the anemometer is an on-site instrument, the environmental conditions during use are far different from those in the laboratory. According to the working principle of the instrument, before calibration, the rotating shaft of the wind speed sensor and the coupling of the anemometer need to be connected by a hose, and it is required that the rotating shaft of the sensor and the rotating shaft of the instrument are strictly concentric. If there is eccentricity in the up, down, left, and right directions after installation, the rotating torque of the coupling cannot be fully transmitted to the rotating shaft of the wind speed sensor, which can easily cause rotational inflexibility and result in measurement errors. Therefore, during installation, it is necessary to repeatedly adjust its concentricity before starting calibration work.
2, Error caused by unstable wind speed
Due to circuit principles, if the data displayed on the anemometer screen is still unstable, recording the data will cause errors in the measurement results. To overcome the impact of this error, it is necessary to wait for the data displayed on the calibrator screen to stabilize after the wind speed value is adjusted, and then record it for at least 2 minutes.
3, Error caused by calibration parameters
There are different wind speed equations for the same wind speed sensor, resulting in different calibration parameters. To calibrate different models of wind speed sensors with a single standard, it is necessary to correct the parameters of different wind speed sensors. When performing calibration, attention should be paid to using the dial of the anemometer to input the relevant calibration parameters, and checking whether the displayed values of the calibrator corresponding to the calibration parameters are correct. If the displayed values are correct, calibration work can be carried out, otherwise measurement errors may occur.
