Verification Regulations for Vortex Flowmeters | Flow Meter Verification Regulations

『Verification Regulations for Vortex Flowmeters』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)

1. What is the accuracy level of vortex flowmeter according to national standards?

The accuracy level of vortex flowmeter follows national standards GB/T 32201-201

5, JJG 1029-2007, etc., and is classified according to the maximum relative error. It is commonly used in industry below 1.0 level. 1. According to Chinas specifications for vortex flowmeters, the main national standards include: • GB/T 32201-2015 (Verification Regulations for Gas Flowmeters) • JJG 1029-2007 (Special Verification Regulations for Vortex Flowmeters) • JB/T 9249 (Technical Specification for Sensors in the Mechanical Industry) Precision level classification is determined based on the maximum relative percentage error, and the system is divided into three categories: - Level 1 standard: 0.00

5, 0.0

2, 0.05 (laboratory level) - Level 2 standard: 0.

1, 0.

2, 0.3

5, 0.5 (process detection level) - Industrial application

1.0, 1.

5, 2.

5, 4.0 (conventional working condition level) 3 Error control requirements take the commonly used 1.0 level instrument in industry as an example: - Allow ± 2% deviation below the boundary flow point - Limit within ± 1% above the boundary flow point. Higher level 0.5 level instruments need to control an error of ± 0.25% within the range of 20% -100%

4. Core quality control indicators - repeatability error should be ≤ 1/3 of the maximum allowable deviation - Dynamic compensation requirements: viscosity fluctuation ± 20%, deviation ≤ ± 0.15%, temperature coefficient ± 0.01% FS/℃, pressure compensation accuracy ± 0.005% FS/kPa

2. What is the difference between vortex flowmeter calibration and calibration? The main differences between the verification and calibration of vortex flowmeters are reflected in nine aspects: purpose, object, nature, basis, method, cycle, content, conclusion, and legal effect. Specifically, the purpose is different. Verification: Mandatory comprehensive evaluation of vortex flowmeters belongs to the category of unified measurement values, which is a top-down process of value transmission aimed at ensuring that the measuring device meets legal requirements. Calibration: Evaluate the indication error against the measurement standard to ensure the accuracy of the measurement value. It belongs to the bottom-up value traceability operation, focusing on meeting the internal use needs of the organization. Different verification objects: Only for mandatory verification measuring devices specified in Chinas metrology law (such as vortex flowmeters in trade settlement, safety protection, medical and health, environmental monitoring and other fields). Calibration: For measuring devices that are not subject to mandatory calibration, that is, devices that are voluntarily sent for inspection by organizations. Different types of testing: mandatory, belonging to the scope of legal metrology management, and is a law enforcement act. Calibration: It is not mandatory and is a voluntary traceability behavior of the organization, determined by the user independently. According to different verifications: It must be based on the National Verification Regulations, which are formulated by the national metrological administrative department and have uniformity and enforceability. Calibration: Based on the organizations own "Calibration Specification" or in accordance with the requirements of the "Verification Regulations", it has high flexibility. Different verific

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