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 machine is finally a fantasy, which is definitely different from the on-site environment. Therefore, in order to ensure the measurement accuracy, it is recommended to Each flowmeter is calibrated for real flow, and the calibrated outflow coefficient is compared with the calculated consequences, 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 quality changes, the Reynolds number changes inversely, which causes the flow coefficient to change.
3. The influence and modification of temperature on the vortex flowmeter. The change of fluid temperature causes the change of density, which leads to the change of the relationship between differential pressure and flow. Secondly, the change of temperature causes the change of the inner diameter of the pipeline and the opening of the orifice plate. The modification of the temperature change is to use a temperature meter to measure the on-site temperature and then output it to the secondary meter to modify the error caused by the temperature change.
4. Collation proofreading. When the vortex flowmeter measures steam and gas flow, it is necessary to check the shrinkage of the fluid. For the detailed correction factor, please refer to the throttling installation design manual.
5. Calculation of steam mass flow rate. When measuring the steam, the vortex flowmeter first obtains the flow value from the differential pressure signal, and then the steam temperature and pressure value look up the table to obtain the density to calculate the steam flow quality.
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