Maintenance and probe selection for anemometer calibration
Wind speed meters are measuring instruments for safety protection and environmental monitoring, and are mandatory calibration measuring instruments stipulated in my country's Measurement Law. In addition to the corresponding calibration report required for factory sales, it is also required to go to the National Air-conditioning Equipment Quality Supervision and Inspection Center or the China Academy of Building Sciences Building Energy and The Environmental Testing Center performs regular calibrations and adjusts all aspects of the instrument to obtain the best working condition according to the statutory calibration certificate issued by it.
Thermal probe for anemometer
The working principle of the thermal probe of the anemometer 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 flow, the indication value of the thermal anemometer flow sensor is often higher than that of the wheel probe. 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 measurement process should be carried out on the straight part 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
The working principle of the anemometer's wheel probe is based on converting rotation into electrical signals. It first passes through a proximity sensor to "count" the rotation of the wheel and generates a pulse series, which is then converted and processed by the detector. Get the speed value. The large-diameter probe (60mm, 100mm) of the 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 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 exploration head.
