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1. Will there be fluctuations during the blowing process of liquid flow using a vortex flowmeter?
Vortex flowmeters used for liquid flow measurement will inevitably experience fluctuations in flow readings during the blowing process, and the amplitude and frequency of the fluctuations are directly related to the pressure, flow rate, and residual impurities in the pipeline of the blowing airflow..
1. Core causes of fluctuations (1) Fluid working conditions deviating from normal production state 1 The vortex flowmeter calculates the flow rate by detecting the frequency of vortex shedding generated when the fluid passes through the vortex generator. Normally, when measuring liquids, the fluid is a continuous and stable flow, and the law of vortex shedding is fixed. When blowing, compressed air or nitrogen is generally used. The flow rate of the sliding airflow will quickly increase from low to the design value, and the supply pressure often fluctuates. The frequency of vortex shedding changes in real time with the flow rate, and the displayed value naturally fluctuates. 2. The blowing airflow will also carry residual condensate, rust slag, and welding slag in the pipeline, which will disrupt the stable generation of vortices and further amplify the fluctuation amplitude. （2） Intermittent characteristics of blowing operation 1 On site blowing mostly adopts the method of intermittent valve opening and closing, and the airflow for a single blow flows in a pulse like manner. The flowmeter reading will show intermittent peaks and drops with the interruption of air flow, forming regular fluctuations.
2. Actual Explanation of Fluctuations 1 If a stabilizing tank and a precision throttle valve are inst
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2. Parameters required for selection of vortex flowmeter
The parameters required for selection of vortex flowmeter are as follows: the name and type of the measured medium should be clearly stated in the measured medium information.
. If the medium is a mixed gas, the volume percentages of each component must be provided, such as the mixing ratio of oxygen and nitrogen, to ensure the adaptability of the flowmeter to the characteristics of the medium. Working pressure: The pressure value of the medium under normal operating conditions. Maximum and minimum pressure: the limit values of medium pressure fluctuations, used to evaluate the pressure resistance range and stability of flow meters. For example, if the pressure fluctuation range of the medium is 0.5-1.5 MPa, it is necessary to ensure that the flow meter range covers this range. Medium temperature parameter working temperature: the temperature value of the medium under normal operating conditions. Maximum operating temperature: The highest temperature that the medium may reach, taking into account the impact of extreme operating conditions on the flowmeter sensor and materials. For example, high-tempera
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