What is the formula for calculating the frequency and flow rate of a vortex flowmeter?

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1. What is the accuracy level standard for micro threaded vortex flowmeters?

The accuracy level standard for micro threaded vortex flowmeters is divided into two categories: international standards and domestic standards. The core is to define the accuracy level by the maximum allowable error.

The international standard ISO 4185 divides accuracy levels into 0.5, 1, 1.5, 2, and 2.5, with corresponding maximum allowable errors of ± 0.5%, ± 1.0%, ± 1.5%, ± 2.0%, and ± 2.5%. ISO 6817 standard: Accuracy levels are divided into 0.2, 0.5, 1, and 1.5 levels, with corresponding maximum allowable errors of ± 0.2%, ± 0.5%, ± 1.0%, and ± 1.5%, respectively.

2. According to the current domestic standard GB/T 2624-2019, the accuracy level and corresponding maximum allowable error of micro thread vortex flowmeter are: | Accuracy level | Maximum allowable error | | ---- | | | | 0.5 level | ± 0.5% | 1 level | ± 1.0% | | 1.5 level | ± 1.5% | 2 level | ± 2.0% | 2.5 level | ± 2.5% | The higher the accuracy level, the stronger the accuracy of the measurement results. When selecting, it is necessary to comprehensively judge based on actual measurement needs, range, and other factors.

2. Working principle of vortex flowmeter

The working principle of vortex flowmeter is based on the Karman vortex phenomenon for flow measurement.

. The following is a detailed explanation of its working principle: The vortex flowmeter is mainly composed of a vortex generator, a detection probe, and corresponding electronic circuits. When a fluid flows through a vortex generator (such as a cylinder), two alternating rows of vortices are formed on both sides, which are called Karman vortex streets. The formation of Karman Yuanwojie flowmeter

vortex street is an important phenomenon in fluid dynamics, which manifests as a series of ordered and alternately arranged vortices on both sides of an obstacle when the fluid passes over it. The frequency of vortex separation is directly proportional to the flow velocity of the sluggish fluid and inversely proportional to the width of the vortex generator. This relationship can be represented by a specific formula, where the vortex separation frequency f, dimensionless constant St (Strouhal number), average fluid velocity V in the pipeline, upstream face width d of the cylinder, and inner diameter D of the sensor housing are all key parameters that affect the measurement results. The Strouhal number St is a function of the Reynolds number Re for a specific type of vortex in a certain flow range. The linear part of the St and Re functions is the linear measurement range of the vortex flow sensor. By detecting the separation frequency of these vortices, the flow velocity and instantaneous flow rate of the fluid can be measured. Specifically, when the vortex alternately separates on both sides behind the cylinder, pressure pulsation is generated, which causes the detection object (also known as the probe) in the sensor to be subjected to alternating force. The piezoelectric crystal components embedded in the detection body will generate charge frequency signals when subjected to alternating forces. After being processed by the detection circuit, this signal can be output in the form of a frequency signal or converted into a standard signal. The number of pulses generated by a unit volume of fluid flowing through a sensor is called the instrument coefficient K. By measuring the number of pulses N and the fluid volume Q, t

What is the formula for calculating the frequency and flow rate of a vortex flowmeter?

1. What is the accuracy level standard for micro threaded vortex flowmeters?

2. Working principle of vortex flowmeter

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