Teknoloji ve Seçim Kılavuz için Anemometreler
Prob Seçim için Anemometreler
The ölçüm aralık akış hız kimden {{{0}} to 100m/s can be bölünmüş üç bölüm): düşük hız: 0 to 5m/s; orta hız: 5 to 40m/s; yüksek hız: 40 to 100m/s. The thermal prob of the anemometer is used for correct measurement of 0 to 5m/S; The Rotary Prob of the anemometer is ideal for measureing the flow velocity of 5 to 40m/s; result. An additional criterion for the correct selection of the flow rate prob of the anemometer is the temperature. Genellikle, the temperature of the thermal sensor of the anemometer is about plus {-70C. The rotor prob of the special anemometer can reach 350C. Pitot tüpler kullanılan yukarı artı 350C.
Termal problar for anemometreler
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 thermal probes in turbulent flow, airflow from all directions impinges on the thermal element simultaneously, which can affect 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 rotary probe. The above phenomenon can be observed in the pipeline measurement process. Depending on the design of the managed pipe turbulence, it can occur even at low speeds. Therefore, the anemometer measurement process should be carried out on the straight part of the pipeline. The starting point of the straight line should be at least 10×D (D=pipe diameter, in CM) before the measuring point; the end point should be at least 4×D behind the measuring point. The flow section must not be obstructed in any way. (angular, resuspended, objects, etc.)
Döner Prob for Anemometreler
The çalışma prensibi of the döner tekerlek prob of the anemometer is based on converting the rotation into an electrical signal. First, it passes through a proximity sensor to "count" the rotation of the return wheel and generate a pulse series, which is then converted by the detector. Get the speed value. The large-diameter prob (60mm, 100mm) of the anemometer is uygun for measureing türbülanslı akış ile orta ve küçük akış oranlar (böyle as at the pipe out). The small-caliber prob of the anemometer is more suitable for measureing the airflow where the cross-section of the pipe is more than the cross-section of the prob.
The correct adjustment position of the rotor prob of the anemometer is that the airflow direction is paralel to the axis of the rotor. When the prob is turned slightly in the air flow, the belirtilen değer will change buna göre. Ne zaman okuma ulaşıyor the maximum value, the prob is in the correct measurement position. Ne zaman ölçme in the pipeline, the distance from the starting point of the straight part of the pipeline to the measureing point should be greater than {{{}}XD, and the influence of turbulent flow on the thermal prob and pitot tube of the anemometer is relatively small.
Anemometre ölçer hava akış hız in boru hattı
Uygulama has kanıtlanmış bu 16mm prob of the anemometer is the most versatile. Its size not only ensure good permeability, but also can withstand a flow velocity up to 60m/s. As one of the fiasible measurement methods, the airflow velocity measurement in the pipeline is suitable for air measurement by the indirect measurement procedure (grid measurement method).
