Anemometer Measuring Techniques and How to Select an Anemometer
Anemometer/Anemometer Probe Selection
The flow velocity measurement range of 0 to 100m/s can be divided into three sections: low speed: 0 to 5m/s; medium speed: 5 to 40m/s; high speed: 40 to 100m/s. Thermal probe of anemometer/anemometer is used for accurate measurement of 0 to 5m/s; the rotating wheel probe of anemometer/anemometer is ideal for measuring flow velocity of 5 to 40m/s; and the use of pitot tube can Best results are obtained in the high speed range. An additional criterion for the correct selection of the flow velocity probe of an anemometer/anemometer is the temperature. Generally, the operating temperature of the thermal sensor of an anemometer/anemometer is about +-70C. Specially designed anemometer/anemometer with rotary probe capable of reaching 350C. Pitot tube is used above +350C.
Thermal probe for anemometer/anemometer
The working principle of the anemometer/anemometer's thermal probe is based on the cold impact airflow taking away the heat on the heating element. With the help of an adjustment switch to keep the temperature constant, the adjustment current is proportional to the flow rate. When using a thermal probe in turbulent flow, airflow from all directions hits the thermal element simultaneously, affecting the accuracy of the measurement results. When measuring in turbulent flows, thermal anemometer/anemometer flow sensors tend to give higher indications than rotary probes. The above phenomena can be observed during pipeline measurement. Depending on the design of how pipe turbulence is managed, it can occur even at low speeds. Therefore, the anemometer/anemometer measurement process should be performed on a straight section of the pipe. The starting point of the straight line part should be at least 10×D (D=pipe diameter, unit: CM) in front of the measuring point; the end point should be at least 4×D after the measuring point. There must be no obstruction in the fluid section. (edges, overhangs, objects, etc.)
Rotary probe for anemometer/anemometer
The working principle of the anemometer/anemometer's wheel probe is based on converting rotation into electrical signals. It first passes through a proximity induction start, "counts" the rotation of the wheel and generates a pulse series, which is then converted and processed by the detector. , you can get the speed value. The large-diameter probe (60mm, 100mm) of the anemometer/anemometer is suitable for measuring turbulent flows with medium and small flow rates (such as at the pipe outlet). The small-diameter probe of the anemometer/anemometer is more suitable for measuring airflow where the cross-section of the pipe is more than 100 times larger than the cross-section of the explorer head.
