Analysis of the problems affecting the use of vortex flowmeters

1) The measurement range of the vortex flowmeter is relatively wide, generally 10:1, but the lower limit of measurement is limited by many factors: Re>10000 is the most basic condition for the vortex flowmeter to work. In addition, it is also affected by the vortex energy. If the flow rate of the medium is low, the strength and rotation speed of the vortex are also low, and it is difficult to cause the sensing element to generate a response signal, and the vortex frequency f is also small, which also makes signal processing difficult. The upper limit of measurement is limited by the frequency response of the sensor (such as the magnetic sensitive type generally not exceeding 400Hz) and the frequency of the circuit. Therefore, the flow rate range must be calculated and calculated during design, and the selection should be made according to the flow rate of the fluid. The environmental conditions of the use site are complex. In addition to paying attention to environmental temperature, humidity, atmosphere and other conditions when selecting models, electromagnetic interference must also be considered. In places with strong interference such as high-voltage transmission power stations and large-scale rectification stations, the magnetic-sensitive type, piezoelectric stress type and instruments cannot work normally or cannot measure accurately. (2) Vibration is also a great enemy of this type of instrument. Therefore, pay attention to avoid mechanical vibration during use, especially the lateral vibration of the pipeline (vibration perpendicular to the axis of the pipeline and the axis of the vortex generator), this effect cannot be suppressed and eliminated in the structural design of the flowmeter. Since the vortex street signal is also sensitive to the influence of the flow field, the length of the straight pipe section cannot guarantee the necessary flow conditions for a stable vortex street, so it is not suitable for selection. Even for the capacitive and ultrasonic types with strong vibration resistance, it cannot be ignored to ensure that the fluid is a fully developed unidirectional flow. (3) The medium temperature also has a great influence on the performance of the vortex flowmeter. For example, the pressure stress vortex flowmeter cannot be used for a long time at 300°C, because the insulation resistance will drop from 10MΩ to 100MΩ at normal temperature to 1MΩ to 10KΩ, and the output signal will also become smaller, resulting in deterioration of the measurement characteristics. Choose magnetic sensitive or capacitive structure. In the measurement system, the sensor and converter should be installed separately to avoid long-term high temperature from affecting the reliability and service life of the instrument.

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