The anemometer uses a volumetric flow funnel at the extraction hole to stop the measurement.
Even if there is no grid interference at the pumping place, the path of air activity has no direction, and its airflow cross-section is extremely uneven. The reason for this is the partial vacuum in the pipeline, and the air is pumped out in the air chamber in the form of a funnel, and there is no location that meets the measurement conditions even in the area close to the pumping interval, so that measurement can be stopped. If the grid measurement method with the function of calculating the uniform value is used to stop measurement, and the volume flow rate method is used to stop measurement, and the volume flow rate is used to determine the volume flow rate, etc., only the pipe or the funnel measurement method can provide repeatable measurement results. In this case, different sizes of measurement funnels can meet the application requirements. The application of the measurement funnel can be generated at a certain interval in front of the sheet valve to meet the conditions of flow rate measurement of a fixed cross-section, measured to locate the centre of the cross-section and fixed cross-section, measured to locate the centre of the cross-section and fixed cross-section, measured to locate the centre of the cross-section and fixed here. The measured value obtained by the flow rate probe is multiplied by the funnel coefficient to calculate the volume flow rate of the pumping. (e.g. hopper factor 20)
Test methods for wind speed
Wind speed test has a uniform wind speed test and turbulence component (wind turbulence 1 ~ 150KHz, different from the change) of the test. Methods for testing uniform wind speed include thermal, ultrasonic, impeller, and skin.
Thermal wind speed test method
This method tests the resistance change of the sensor when it cools down due to wind in the energised state, and thus tests the wind speed. It does not provide information on wind direction. In addition to being easy and convenient to carry, it has a high cost/performance ratio, and is commonly adopted as a standard product for anemometers. Thermal anemometers are available with platinum wires, thermocouples, and semiconductors, but we use platinum coiled wires. The material of platinum wire is materially stable. Therefore, it has advantages in long-term stability and temperature compensation.
