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How to ensure the accuracy of vortex flowmeter measurement

The vortex flowmeter is a new type of flowmeter developed based on the Karman vortex principle. The vortex flowmeter is suitable for measuring the mass flow rate and volume flow rate of superheated steam, saturated steam, compressed air, general gas, water and low corrosive liquid.

How can I ensure the accuracy of vortex flowmeter measurement during installation? The following describes:

1. The vortex flowmeter is calibrated one by one before leaving the factory. Since the outflow coefficient is calculated by the software, the calculation of the calculation of the computer after all is quite different from the on-site environment. Therefore, in order to ensure the measurement accuracy, the initiative is Each flowmeter is subjected to real-flow calibration, and the calibrated outflow coefficient and the calculated consequences are compared, and the difference is calculated and modified.
2. The Reynolds number is modified. There is a positive relationship between the flow coefficient of the vortex flowmeter and the Reynolds number. When the mass flow is changed, the Reynolds number is inversely changed, thus causing a change in the flow coefficient.
3. The influence of temperature on the vortex flowmeter and its modification, the change of the density caused by the change of the fluid temperature, thus causing the change of the relationship between the differential pressure and the flow rate. Secondly, the change of the temperature causes the inner diameter of the pipe and the change of the opening of the orifice plate. The modification of the temperature change is to use the temperature meter to measure the field temperature and then output it to the secondary meter to modify the error caused by the temperature change.
4, shrinkable proofreading. When measuring the steam and gas flow rate, the vortex flowmeter must perform the collapsibility calibration of the fluid. The detailed calibration coefficient can refer to the throttling installation design manual.
5, the calculation of steam mass flow, vortex flowmeter when measuring steam, first obtain the flow value from the differential pressure signal, and then the steam temperature, pressure value to find the density to calculate the steam flow quality.

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