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1. What is the accuracy level of vortex flowmeters according to national standards?
The accuracy level of vortex flowmeters in the tracking range follows national standards such as GB/T 32201-201
5, JJG 1029-2007, etc., and is classified according to the maximum relative error. Shen Luan Industry commonly uses levels below 1.0. 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, State Circle 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 and electromagnetic flowme
There are differences between vortex flowmeters and electromagnetic flowmeters in terms of principles, applicable media, accuracy errors, applicable scenarios, and prices, as follows:
1. Different principles. Vortex flowmeters: Based on the "Karman vortex street" principle, non streamlined flow elements are used to generate vortices in the fluid, and the flow rate is calculated using the linear relationship between vortex frequency and medium flow velocity.
. Electromagnetic flowmeter: Based on Faradays law of electromagnetic induction, an induced potential is generated by cutting a magnetic field through a conductive liquid, and the flow rate is calculated by detecting the potential value through electrodes (formula E=K × B × V × D).2. Vortex flowmeter suitable for different media: suitable for liquids or gases, but with certain requirements for medium temperature, pressure, and viscosity.
. Not applicable to: viscous liquid, granular solid medium, liquid containing foam or bubbles. Advantages: No moving mechanical parts, long lifespan, low maintenance, stable instrument coefficient, but installation under vibration conditions should be avoided. Electromagnetic flowmeter: only applicable to conductive liquids (such as acid, alkali, salt solutions), with high requirements for medium purity. Limitation: Unable to measure non-conductive media (such as oil and gas).III. Different Accuracy Errors Vortex Flowmeters: The accuracy and stability are relatively low, and the error range is usually between 1% and 2%.
. Electromagnetic flowmeter: With high accuracy and stability, the error can be controlled within 0.5%, making it suitable for high-precision measurement needs.4. Dif