Vortex flowmeter measures steam mass flow Vortex flowmeter is a volume flowmeter, that is, within a certain range of fluid Reynolds number, its output is only proportional to the volume flow. The output of vortex flowmeter includes frequency signal and analog signal, and the analog output is obtained by f/ conversion on the basis of frequency output. This conversion loses about 0.1% accuracy. Therefore, when it is used to measure steam flow, users prefer to use frequency output. There are several other reasons why frequency output vortex flowmeters are more popular with users such as thermal companies. a. The price of the frequency output vortex flowmeter is slightly lower (non-intelligent type) b. It is more convenient to modify the full scale of the frequency output vortex flowmeter, just simply operate the buttons on the panel of the programmable flow calculator according to the prescribed method can be achieved. c. To calculate the steam mass flow from the frequency signal output by the frequency output vortex flowmeter, you only need to know the current working condition of the fluid, while the temperature and pressure compensation of the analog output vortex flowmeter is only the error caused by the deviation of the current working condition from the design working condition. Compensation, therefore, not only the current operating conditions, but also the design operating conditions need to be known. The data of the latter working condition often causes errors due to the loss of data due to the passage of time or personnel changes. In contrast, the frequency output vortex flowmeter does not have this problem. Influence of humidity on measurement results when using vortex flowmeter. The output of the vortex flowmeter is only proportional to the flow velocity of the fluid flowing through the measuring tube. When measuring wet saturated steam, the influence of water droplets on the output of the vortex flowmeter is negligible, so it can be considered that the output of the vortex flowmeter is entirely caused by the wet flow. Caused by the dry part of the steam. The density of the dry part, whether it is pressure compensation or temperature compensation, can be detected more accurately. The results of steam measurement are often used as the basis for economic settlement between the supply and demand sides. If the two parties agree to settle the fee according to the dry part of the steam and no charge for the condensed water, the impact of the phase change on the measurement is negligible and can be ignored.
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