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1. What is the level standard for flow meters? The accuracy level of flow meters is divided by the percentage of allowable error to the full range. The current mainstream in China follows national/industry specific standards, and different types of flow meters correspond to different accuracy level classification rules. 1. General level classification logic The core criterion for determining the accuracy level of a flow meter is the maximum allowable error, and the mainstream method is to use the full-scale reference error (% FS) of slag lead, which is the percentage of the error value to the full-scale scale of the flow meter; Some high-precision flow meters may use indication error (% RD), which is the percentage of the error value to the actual measured value. The smaller the grade value, the higher the accuracy. The marked grade value directly corresponds to the upper limit of the absolute allowable error. For example, the indication error of a 1.0 grade flow meter does not exceed ± 1.0% FS The current domestic standard is GB/T 18659-2017 "Electromagnetic Flow Meter", with accuracy levels divided into 0.2, 0.5, 1.0, and 1.5. Among them, 0.2 is only applicable to the standard reference conditions of clean conductive liquids at 20 ℃ and atmospheric pressure. 2. Electromagnetic flow meters with a grade of 0.2 or above should be selected for trade settlement scenarios, and industrial general measurement often uses 0.5 or 1.0 grade products. （2） Vortex flowmeter 1 According to GB/T 20727-2006 "Vortex Flow Meter", the standard Liang Chun divides the accuracy levels into 0.5, 1.0, 1.5, and 2.5. The new model can achieve an accuracy of 0.2. 2. 0.5 is mostly used for high-precision measuring stations, and 1.0 is the gener
2. Volumetric flow meters used for settlement of refined oil trade shall comply with GB/T 18603-2017 "Liquid volumetric flow meters", with a mandatory accuracy level of not less than 0.2 level. （4） Turbine flowmeter 1 The current standard is JB/T 9242-2017 "Turbine Flow Sensor", with accuracy levels of 0.1, 0.2, 0.5, and 1.0. Among them, 0.1 is the highest accuracy level and is mostly used for laboratory calibration or precision fluid measurement scenarios. （5） Differential pressure flowmeter (orifice plate, nozzle, Venturi tube, etc.) 1 According to GB/T 2624.1~4-2006 "Measurement of Fluid Flow in a Circular Tube Using Orifice Plates, Nozzles, and Venturi Tubes", the overall accuracy level is usually between 0.5 and 2.5 levels. The actual accuracy is greatly affected by the installation conditions and the matching degree of the matching differential pressure transmitter. （6） Ultrasonic flowmeter 1 Implementing GB/T 32209-2015 "Ultrasonic Flow Meter", the accuracy level is divided into 0.5 level, 1.0 level, and 1.5 level, and is mostly used for non-contact flow measurement scenarios with large pipe diameters.
2. Flow Meter Calibration Regulations
The calibration of different types of flow meters must strictly match the corresponding national/international metrological st