The working principle of the thermal probe of the anemometer
The working principle of the thermal probe of the anemometer is based on the cold impact air flow 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, the airflow from all directions impacts the thermal element at the same time, which will affect the correctness of the measurement results. When measuring in turbulent flow, the indication value of the thermal anemometer flow sensor is often higher than that of the rotary probe. The above phenomenon can be observed in the pipeline measurement process. Depending on the design of the pipe turbulence, it can occur even at low speeds. Therefore, the anemometer measurement process should be carried out on the straight line of the pipeline. The starting point of the straight line should be at least 10×D (D=pipe diameter, in CM) before the measurement point; the end point should be at least 4×D after the measurement point. The flow section must not be obstructed in any way. (angular, resuspended, objects, etc.)
