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1. Calibration of Vortex Flow Meter
The calibration of vortex flow meters is an important step to ensure their accuracy and legality during use, mainly carried out through two methods: the standard meter method and the bell jar method. Standard table method: Principle: Connect the vortex flowmeter as a standard with the tested flowmeter in series, and calculate the error of the tested flowmeter by comparing the readings of the two. Scope of application: Suitable for various fluids and liquids of different viscosities. Advantages: Installed in a closed system, it can reduce time measurement errors; Having the advantages of online verification and serving as a measurement standard for closed pipelines; High degree of automation, compact equipment, and low cost. Attention: The accuracy and stability of the standard table itself need to be regularly monitored. Bell jar method: Principle: The device based on lead stove and volumetric method calculates the flow rate by measuring the change in gas volume when the bell jar rises or falls. Scope of application: Suitable for calibrating air flow meters that are close to atmospheric pressure, such as gas meters and wet gas flow meters. The verification flow range is relatively small, with an accuracy between 0.2% and 0.5%. Attention: When using a water sealed bell jar for exhaust calibration, it is necessary to consider the possible errors caused by water vapor condensation when the temperature of the flowmeter being tested is lower than the water temperature. In practical applications, it is necessary to select an appropriate calibration method based on factors such as the usage scenario, fluid type, and calibration requirements of the vortex flowmeter.
2. If a 
If a vortex flowmeter is applied for mandatory inspection but not sent for inspection according to regulations, it will be tested by a non designated institution on its own, which will bring various adverse effects..
1. Legal Risks of Violating Metrology Regulations 1 Mandatory calibration of measuring instruments should be carried out by legal metrological calibration institutions or authorized institutions. Sending instruments for self calibration to non designated institutions is a violation and may face warnings and fines from regulatory authorities. It may also affect the recognition of enterprise metrological qualifications. When it comes to mandatory calibration scenarios such as trade settlement and security protection, flow meter data that has not been calibrated according to regulations has no legal effect, which may lead to transaction disputes, inability to protect rights, or security risks caused by inaccurate data.
2. Loss of dust effectiveness in measurement data 1 Testing reports issued by non designated institutions are not recognized by regulatory authorities, and flow meter measurement data cannot be used as legal measurement vouchers. There may be loopholes in the internal measurement management system of the enterprise. When used for production process monitoring or energy measurement, flow meter data that has not been legally verified may have no guarantee of accuracy, which may lead to production parameter loss of control, energy statistics distortion, and affect enterprise operation decisions.
III. Difficulties in Subsequent Verifi
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