The characteristics and application of Verabar flow meter

Abstract: The characteristics and application information of Verabar flowmeters are provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Differential pressure flowmeters are widely used in the industrial field, accounting for more than 70% of the total number of flowmeter applications in the entire industry. With the rapid development of electronic technology, the level of transmitter and secondary instrument has undergone a qualitative leap, and the accuracy, sensitivity and function have reached a higher level. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the characteristics and application details of Verabar flowmeters. Differential pressure flowmeters are widely used in the industrial field, accounting for more than 70% of the total number of flowmeter applications in the entire industry. With the rapid development of electronic technology, the level of transmitter and secondary instrument has undergone a qualitative leap, and the accuracy, sensitivity and function have reached a high level, and the transmitter can distinguish the pressure difference as small as a few Pa. However, there has not been a major breakthrough in the problem of measuring the source components once for decades, which has become a bottleneck restricting the horizontal development of differential pressure flowmeters. 1 The structure of the Verabar flowmeter The probe of the Verabar steam flowmeter is a single-piece double-chamber structure probe made of 316 stainless steel. Velocity profile of pairs of pressure taps throughout the entire pipeline. The pressure-taking holes facing the fluid read the high-pressure average signal, and the low-pressure pressure-taking holes on the side and rear sides of the probe, before the separation point between the fluid and the probe, read the low-pressure average signal. 2 The principle of Verabar flowmeter When the fluid flows through the probe, a high-pressure distribution area is generated in front of it, and the pressure of the high-pressure distribution area is slightly higher than the static pressure of the pipeline. According to the principle of Bernoulli's equation, when the fluid flows through the probe, the speed increases, and a low-pressure distribution area is generated at the rear of the probe. The pressure of the low-pressure distribution area is slightly lower than the static pressure of the pipeline. After the fluid flows through the probe, a partial vacuum is generated at the back of the probe, and vortices appear on both sides of the probe. The Velocity Flow Probe can accurately detect the average differential pressure generated by the average velocity of the fluid. Like other differential pressure flow meters, it follows Bernoulli's equation qv=KC△p(1) where qv—Volume flow of fluid; K—Flow coefficient; C—Flow constant (constant); △p—Differential pressure generated by the differential pressure generator. C is a constant. To determine qv, K and Δp must be determined. 2.1 Flow coefficient K According to aerodynamics, fluid mechanics theory, boundary layer theory and actual fluid test data, after the exploration of 5a, the mathematical analysis model of K of the Verabar flow probe was pioneered. K=1/[1/(1-Cbβv)+C](2) where Cb—boundary layer coefficient;βv—blocking factor. This is a supplement to the specific application of Bernoulli's equation theory. 1) The accuracy of K is +0.5%, confirmed by comprehensive testing by the world-renowned independent flow laboratory. 2) K is linear, and its change has nothing to do with the change of Reynolds number, which ensures that the measurement result can reach an accuracy of +0.5% at a turndown ratio higher than 10:1. 3) The flow coefficient of Verabar is more accurate and easier to know than other flow meters. 2.2 The accuracy and stability of the differential pressure △p△p read by the Verabar flowmeter depends on the unique scientific design of the Verabar flowmeter: 1) The shape of the probe receives the least traction, so that the separation point between the fluid and the probe is fixed. 2) The use of a complete metal cavity structure avoids the leakage between the chambers caused by the three-piece structure of other probes, increases the strength of the probe, and ensures its accuracy. 3) The low pressure holes are taken on the back two sides of the probe side, before the separation point between the probe and the fluid, so that the low pressure holes are not affected by eddy currents, and the low pressure holes are prevented from being blocked, so that the low pressure signal is more stable and the measurement is more accurate. 4) Rough surface treatment and anti-silting groove: control the surface layer. Under various flow rates, the surface layer of the fluid on the probe surface is a turbulent layer, which ensures that the probe can still obtain stable and accurate signals when the flow rate is low. 5) The probe passes through the entire section of the fluid in the pipeline, and the pressure is taken by multiple pressure-taking holes. The spacing of the pressure-taking holes is obtained after the area integration, and the measured signal is the real signal reflecting the average velocity of the fluid. 3 Main features 1) It can detect the temperature and pressure of the medium and automatically compensate the flow, with an accuracy of +1.0%. 2) Long-term stability of accuracy can be guaranteed. 3) The anti-blocking design of the Verabar flowmeter probe completely gets rid of the drawbacks of the plug-in type such as Anuba flowmeters that are easy to block, so that the level of the uniform tube flowmeter has reached an unprecedented height. 4) No mechanical moving parts, not easy to corrode, high reliability, good stability and less maintenance. 5) A hand valve is set at the interface of the valve, which makes installation and maintenance simpler, reduces the number of fittings, and reduces the cost of hardware connection. 6) The well-designed three-way joint allows direct connection with the transmitter, without the need for three-valve manifolds and impulse pipes. 7) The flexible QuickJackHotTap operating system can easily and quickly complete the insertion and retraction of the probe. 8) The safety spring locking device keeps the probe well sealed and securely installed. When the pipe size changes or when pressure, temperature and mechanical force changes, the probe can maintain stress contact with the opposite pipe wall at all times. 9) Small pressure loss and low energy consumption. 4 Application of Verabar flowmeter Verabar flowmeter can be used in major petrochemical enterprises to measure the flow of various single-phase gas, liquid and steam media under full pipe conditions.

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