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The use of hot bulb anemometer

by:HoldPeak     2020-05-25

hot bulb anemometer using method: first introduce what is hot bulb anemometer, this is a kind of to measure wind speed of the basic functions. This is a portable, intelligent, multi-function basic instrument of low wind speed measurements. Working principle of the

hot bulb anemometer works: cold shock airflow away heat element ( Such as thermal probe) Switch to adjust the heat, and then with the help of a temperature constant, then adjust current and flow rate is proportional to the relationship. Application field

hot bulb anemometer in heating, ventilation, air conditioning, environmental protection, energy conservation monitoring, meteorology, agriculture, refrigerating, drying, labor health survey, clean workshop, chemical fiber textile, various aspects such as wind speed laboratory has a wide range of USES.

general anemometer and the difference between hot bulb anemometer?

the site according to the principle of wind measurement points are differential, the impeller type, hot bulb three

differential is measuring the velocity of the classic methods of fluid mechanics, mainly rely on the pitot tube out pressure and differential pressure gauge measurement, again according to the equation to calculate the velocity 'efforts. Advantages of this method is low detection limit, high sensitivity, but the flow field uniformity of the demand is higher, in the environment easily because of the non-uniform flow field measurement uncertainty, so the differential method is mainly used in duct in measuring wind speed

depend mainly on the wind impeller rotating impeller type, produce electromagnetic signal to measure, the advantage of this approach is more durable, instrument used in measuring for a long time, the three cups of type anemometer used in meteorological observation is the same principle, the disadvantage is that the sensitivity is a bit poor

hot bulb is the main principle of the probe set a constant temperature, air flow sensor can take away heat, after the probe is heated to the set temperature, the process will have electrical signal collection instruments, and in accordance with the conversion of wind speed. This method has the advantage of high sensitivity, large range, to adapt to the environment measurement, the disadvantage is that the probe connection in hot ball of platinum wire is weak, if not be careful in using easy to probe damage beyond repair. At present domestic hot bulb anemometer or old-fashioned anemometer, institute building air conditioning already has a more advanced alternative technologies, will heat the ball in for the ceramic thermal column, the intensity of heat ball better

this is primarily a field measurement, there are other more scientific in laboratory measurements of the more classical methods, such as orifice meter

note

edit when used in turbulent thermal probe, from all directions of air flow and heat shock element, which would affect the accuracy of the measurement results. Measurement in turbulent flow, the thermal anemometer, the velocity sensor is often higher than the value of the wheel probe. The above phenomenon can be observed in the process of pipe measurement. According to different design management of turbulent flow in pipe, even at low speeds.

therefore, anemometer measurement process should be performed in the linear section of the pipeline. Starting point of the straight line part should be at least 10 before the measurement point; D( D = pipe diameter, the unit is CM) Outside; The finish at least after the measurement point 4; D. Fluid section shall not have any shade ( Such as edges and corners, suspension, objects, etc. ) 。

anemometer probe options: 0 to 100 m/s of velocity measurement range can be divided into three sections: low speed: 0 to 5 m/s; Medium: 5 to 40 m/s; High speed: 40 to 100 m/s. Anemometer thermal probe is used for accurate measurement of 0 to 5 m/s; Anemometer turn wheel probe measurement 5 to 40 m/s the velocity effect of the ideal [ 1] 。

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