National standard for vortex flowmeter

『National standard for vortex flowmeter』Related information(v cone flow meter|rotary gas meter|gallon meter|gear meter|metal tube rotameter|glass tube rotameter|nutating disk meter|transit time ultrasonic flow meter|wedge flow meter|pd meters|hydraulic flow meter|ultrasonic water flow meter|water flow meter|air flow meter|magnetic water flow meter|oxygen flow meter|gas flow meter|argon flow meter|air velocity meter|gasoline flow meter|fuel flow meter|ultrasonic water meter|digital water meter|nitrogen flow meter|solid flow meter|Oxygen tank flow meter|digital water flow meter|diesel fuel flow meter|steam flow meter|02 flow meter|compressed air flow meter|oil flow meter|liquid flow meter)

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: - Allowable ± 2% deviation below the boundary flow point - Restricted within ± 1% above the boundary flow point. 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: Deviation of viscosity fluctuation ± 20% should be ≤ ± 0.15%, temperature coefficient ± 0.01% FS/℃, pressure compensation accuracy ± 0.005% FS/kPa

2. Straight pipe section requirements for flow meters

>GB 50093-2002 Automation Instrument Engineering Construction and Acceptance Specification for Flow Meter Upstream and Downstream The usual requirements for straight pipe sections are as follows: - rotor flowmeter, upstream not less than 0-5 times the pipe diameter, downstream no requirements; ——Target flowmeter, with an upstream diameter not less than 5 times the pipe diameter and a downstream diameter not less than 3 times the pipe diameter; ——Turbine flowmeter, with an upstream diameter not less than 5-20 times the pipe diameter and a downstream diameter not less than 3-10 times the pipe diameter; ——Vortex flowmeter, with an upstream diameter not less than 10-40 times the pipe diameter and a downstream diameter not less than 5 times the pipe diameter; ——Electromagnetic flowmeter, with upstream diameter not less than 5-10 times the pipe diameter and downstream diameter not less than 0-5 times the pipe diameter; ——Ultrasonic flowmeter, with an upstream diameter not less than 10-50 times the pipe diameter and a downstream diameter not less than 5 times the pipe diameter; ——Positive displacement flowmeter, no requirements; ——Orifice plate, upstream not less than 5-80 times the pipe diameter, downstream not less than 2-8 times the pipe diameter; ——Nozzle, with an upstream diameter not less than 5-80 times the pipe diameter and a downstream diameter not less than 4 times the pipe diameter; ——Venturi tube, bent tube, wedge-shaped tube, upstream not less than 5-30 times the pipe diameter, downstream not less than 4 times the pipe diameter; ——Uniformity tube, with an upstream diameter not less than 3-25 times the pipe diameter and a downstream diameter not less than 2-4 times the pipe diameter. Additional information: Flow met

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