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Anemometer using method, how to correctly use anemometer

by:HoldPeak     2020-05-11

anemometer, the working principle of thermal probe is based on the impact of cold air take away heat thermal element, with the help of a switch, to maintain a constant temperature, the adjusting current and flow rate is proportional to the relationship. 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. ( Edges and corners, the heavy suspension, content, etc. )

the propeller anemometer probe

the propeller anemometer sensor working principle is based on the rotation is converted into electrical signals, after a close first induction, beginning to count the rotation of the wheel and generate a pulse series, then through detector conversion processing, can get the speed value. Large diameter probe anemometer ( 60mm,100mm) Suitable for the measurement, small velocity of turbulent flow, As in the pipeline export) 。 Anemometer probe more suitable for measurement of small diameter pipe cross section is greater than the adventure changed head transverse 100 times more air flow.

anemometer in the location in the air flow

the propeller anemometer probe the correct position, the adjustment is the air flow direction parallel to the axle. Gently turn the probe in air, the values will change. When reading maximum, namely that the probe in the correct position. Measurement in the pipeline, pipe straight part of the starting point to the distance measurement point thrown so 0 xd, turbulent thermal probe of anemometer and the influence of the pitot tube is relatively small.

anemometer in the smoke gas exhaust measuring

vent will greatly change the distribution of pipe flow is relatively balanced state: high speed in free surface of the vent area, the rest part is low speed area, and generate vortex on the grid. According to the different design methods of grid, a certain distance in front of the grid ( About 20 cm) , stable air flow cross section. In this case, usually with large diameter wheel of anemometer measurement. Because of the larger diameter can carry on the average, to the uneven flow velocity and calculating the average on a wide range.

anemometer in porosity using measurement of volume flow funnel:

even if without the distraction of grid on the extraction, air flow route are also have no direction, and the uneven airflow cross section. Partial vacuum, the reason is that the pipe to funnel put out in the air chamber in the air, even in the areas close to the suction also does not have the position of a measuring conditions, for measuring operation. If use with the function of average grid measuring method to measure, and measure so as to determine the volume flow method, and so as to determine the volume flow, etc. , only a pipe or funnel method can provide a repeatable measurements. In this case, different size of measuring funnel can satisfy the use requirement. Measuring funnel can be used to a certain distance in front of the plate valve in generating a fixed section, velocity measurement condition to measure the section center and fixed section, to measure the section center and fixed cross section, the location of the cross section is measured and fixed in the center. Velocity probe measurement value multiplied by funnel coefficient, volume flow rate can be calculated out.

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