Specify vortex flowmeter| air mass flow meter

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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 a deviation of ± 2% below the boundary flow point - Limit the deviation above the boundary flow point to within ± 1%. Higher level 0.5 level instruments need to control an error of ± 0.25% in 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. Flow range of vortex flowmeter

The flow range of

vortex flowmeter is mainly determined by the sensor diameter and fluid properties. The larger the diameter, the more measurable it can be.

The wider the flow range. The conventional liquid measurement range is between 0.5m/s and 7m/s flow rate, and the gas measurement range is between 5m/s and 60m/s. 1. Correspondence between caliber and flow rate (under normal temperature water conditions) The flow range is directly related to the instrument caliber, and the following are typical parameters (referring to the product manuals of mainstream domestic manufacturers such as Chuanyi and Ganges in 2023): • DN15: minimum about 1.2 m ³/h, maximum about 15 m ³/h • DN25: minimum about 3 m ³/h, maximum about 40 m ³/h • DN50: minimum about 10 m ³/h, maximum about 150 m ³/h • DN100: minimum about 40 m ³/h, maximum about 650 m ³/h • DN200: minimum about 150 m ³/h, maximum about 2500 m ³/h • DN300: minimum about 300 m ³/h, maximum about 5500 m ³/h. 2. Influence of fluid medium • Liquid measurement (Water, oil, etc.): The flow rate range is usually 0.5-7 m/s, and liquids with viscosity higher than 30cP will significantly increase the measurement lower limit. Gas measurement (air search, steam, etc.): The flow rate range is usually 5-60 m/s, and low-pressure gases may have an increased lower limit flow rate due to low density. • Steam measurement: It is necessary to distinguish between saturated steam and superheated steam, and the flow range should be calculated based on temperature and pressure compensation to determine the actual mass flow rate. Avoid long-term use below the lower limit of 20%, otherwise the signal stability will deteriorate and errors will increase. • The maximum flow rate shall not exceed 120% of the upper limit v

Specify vortex flowmeter

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

2. Flow range of vortex flowmeter

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