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Industry Information
Verabar flowmeter is developed based on the principle of pitot tube flow measurement
2012-3-26 9:21:19

的安装到底如何进行安装来满足,怎样才能威力巴流量计进行正确的安装和布置,我给大家讲讲关于一些威力巴流量计的方法: 第一:可以测量气体、液体和蒸气等各种介质,应用范围广泛,且测量信号稳定、波动小。 How to install Verabar flowmeter to meet the installation, how to properly install Verabar flowmeter, I will tell you about some Verabar flowmeter methods: First: can measure gas, liquid and vapor And other media, the application range is wide, and the measurement signal is stable and the fluctuation is small. Verabar's pressure loss is only about 1.6% of the orifice pressure loss. Within a certain temperature and pressure range, the density change is greater than the measurement accuracy requirement. Second: Verabar flowmeter installation is divided into on-line type and universal type, especially on-line type can be installed without stopping production. It overcomes the characteristics of traditional detection component installation, cleaning must be stopped, and inconvenient loading and unloading. The pressure-sensing pipe and valve are directly connected to the transmitter, which reduces the intermediate links such as the pressure-taking pipeline, reduces the cost, and reduces the failure point. Third: simple installation, only need to open a small hole in the pipe and weld a base, without cutting the pipe, some media can be installed online, and the probe can be taken out for inspection at any time, the installation cost is low, and the maintenance is basically free; Non-restrictive throttle design, at least 95% lower than the permanent pressure loss of the orifice plate; As the Verabar connector can be directly connected to the transmitter, three sets of valves and impulse pipes are not needed, which prevents leakage and blockage of the impulse pipes Measurement errors caused by

是通过差压来测量流量的装置,是在皮托管流速测量原理的基础上发展起来的。 ZP-HLV Verabar flowmeter is a device for measuring flow through differential pressure. It is developed based on the principle of pitot tube velocity measurement. Measures the flow of fluids such as liquids, gases and steam. Because there are no moving parts, there is almost no pressure loss, convenient installation and maintenance, and extremely low operating costs, which is favored by users.
The sensor is composed of a detection rod, a pressure taking port and a guide rod. It crosses the interior of the pipe and is perpendicular to the tube axis. There are multiple pressure measurement holes on the upstream side of the measurement rod to measure the average value of total pressure. The flow surface has static pressure pressure measuring holes, which are led out by the total pressure impulse pipe and the static pressure impulse pipe respectively, and the flow rate through the pipeline is calculated according to the differential pressure value of the total pressure and the static pressure. The static pressure on the backflow surface of the sensor can also be replaced by the static pressure on the wall of the flow tube.
The averaging tube flow transmitter is a flowmeter composed of sensors, plenum accessories and differential pressure transmitters, pressure transmitters, flow totalizers and other supporting devices.
The averaging tube flow sensor combined with the differential pressure transmitter, pressure transmitter, temperature transmitter and flow totalizer produced by our company can form various types of averaging tube flowmeters. Different types of averaging tube flowmeters can also be made using differential pressure transmitters, pressure transmitters, temperature transmitters and flow totalizers from any manufacturer.
Working principle The average velocity tube flow sensor is developed based on the principle of pitot tube speed measurement. It determines the flow rate by the product of the average velocity of the pipeline and the effective cross-sectional area of the pipeline. Velocity distribution in general pipelines is uneven. If it is a fully developed fluid, its velocity distribution is exponential. In order to accurately measure, a plurality of semi-circles and a plurality of semi-rings having the same area as a plurality of elements are divided on the entire circular cross-section. The detection rod of the sensor is composed of a hollow metal tube, and multiple pairs of total pressure holes are drilled on the upstream side. They are respectively located in the center of each unit area and reflect the velocity of the flow in each unit area. Because the total pressure holes are connected, after the total pressure value transmitted to each point in the detection rod is averaged, it is led to the high-pressure joint by the total pressure lead-out pipe and sent to the positive pressure chamber of the sensor. When the sensor is correctly installed on a process pipe with a long enough straight pipe section, there should be no vortex on the flow section. The static pressure of the entire section can be considered constant. There are detection holes on the back or side of the sensor, which represent the entire section. Static pressure. The static pressure outlet pipe is led from the low-pressure joint to the negative pressure chamber of the sensor. The square of the pressure difference between the positive and negative pressure chambers is proportional to the average flow velocity of the flow cross section, and the relationship between the differential pressure and the flow is obtained. 在此关系的基处上,可由伯努利方程和连续性方程推导得到均速管流量计的流量计算公式 On the basis of this relationship, Verabar flowmeters can be derived from Bernoulli's equations and continuity equations to obtain flow calculation formulas for averaging tube flowmeters.
Qv = α﹒ ε﹒ (π / 4)﹒ D2﹒ (2? P / ρ1) 0.5
Qm = α﹒ ε﹒ (π / 4)﹒ D2﹒ (2? P﹒ρ1) 0.5
Where: Qv: Volume flow Qm: Mass flow
α: sensor structure coefficient
△ P: Differential pressure value ε: Fluid expansion coefficient
ρ: density under fluid conditions ε: fluid expansion coefficient ε = 1 for incompressible fluid, ε ﹤ 1 for compressible body, if SI, D, △ P, ρ1 are used in the formula, the unit of QV is The unit of M3QS and Qm is ㎏ ∕ S.
The flow coefficient α and the expansibility coefficient ε of the sensor are obtained by calibration on a standard device, and are stated on the certificate of conformity when leaving the factory.