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What are the acceptance criteria for flow meters? The acceptance criteria for flow meters mainly include appearance, performance, stealth function, installation, and stability. 1. The appearance inspection of the instrument surface should be free of obvious scratches or cracks, and the model, specifications, and other information on the nameplate must be clear and accurate. The connection part needs to be firm, ensuring good sealing and no looseness or leakage. 2. The accuracy of performance indicators should meet the design requirements. By comparing with high-precision standard flow meters, the error should not exceed the specified range. For example, the error of 0.5 level accuracy should be within ± 0.5%. Repeatability requires consistent results from multiple measurements, with errors typically not exceeding one-third of the specified accuracy level. The range ratio needs to reach the specified value to ensure accurate measurement within a wide flow range. 3. The functions of each Zen rental item, such as cumulative flow display, signal output, and alarm, should work normally during functional testing. Intelligent flow meters also need to test their communication function to ensure normal data transmission with the upper computer or other devices. Installation and inspection should comply with the product manual and specifications, including the position, pipeline connection method, and length of the straight pipe section. For example, the length of the upstream straight pipe section should not be less than 10 times the pipe diameter, and the downstream should not be less than 5 times the pipe diameter. 5. Operational stability: Within the specified operating time, the flow meter should operate stably with no si
2. What is the national standard for the accuracy level of vortex flow meters?
The accuracy level of vortex flow meters follows the national standards 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: 0.005, 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: Deviation of viscosity fluctuation ± 20% should be ≤ ± 0.15%, temperature coefficient ± 0.01% F