Principle and structure of Delta Bar flow meter

Abstract: The principle and structure information of the Delta Bar flow meter are provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. Measuring principle Delta Bar flowmeter is a kind of flow sensor designed and generated by using the working principle of differential pressure and plug-in installation method. The way of taking pressure is through a probe (or probe) with a diameter of about 20 mm, and there are two rows of uneven points in the front and rear of the probe. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the principle and structure of the Delta Bar flowmeter. Measurement principle Delta Bar flowmeter is a flow sensor designed and generated by using the working principle of differential pressure and the installation method of plug-in. The way of taking pressure is through a probe (or probe) with a diameter of about 20 mm, and there are two rows of unevenly distributed pressure holes of 8 mm before and after the probe. Through the two rows of holes, the different pressures (/flow velocity) of the pipeline from top to bottom (/from left to right) are averaged in the holes, (because the flow velocity on both sides of the pipeline is slow, and the middle is fast) to form a differential pressure, which can then be calculated. out mass flow or volume flow. Scope of application 1. Nominal pressure: 25mm≤DN≤6000mm2, nominal pressure: PN≤25MPa3, medium temperature: t≤650℃ 4. Accuracy grade: grade 0.2, grade 0.5, grade 1, grade 1.5 Detailed introduction Pipeline power loss is small (small pressure loss): the pressure loss of the usual uniform velocity pipe is much smaller than that of the orifice plate, only the pressure loss of the orifice plate 5~10%; on the other hand, due to the small pressure loss, the differential pressure will be small (the pressure difference between high pressure and low pressure), which will increase the requirements for the selection of differential pressure transmitters and increase the cost, otherwise the transmitter will be The accuracy of the output decreases because the range cannot be full scale. So a good probe must take into account both pressure loss and differential pressure. The surface design of Deltaba takes this factor into full consideration. The cross-section itself is symmetrical, and the surface is divided into three parts (as shown in the figure below). The flow velocity of the medium is accelerated by an average of three times. By increasing the contact surface with the medium, the pressure in the oncoming section is increased; the third part is the high and low pressure boundary peak, and the resistance suddenly disappears, forming a low pressure area behind the probe. The actual color velocity spectrum can fully reflect Changes in the flow rate of the medium. Therefore, the design of the Delta Bar probe meets the requirements of small pressure loss and large differential pressure. High Accuracy: Tested by third parties and according to the latest data, 2% accuracy can be achieved despite fairly short straight pipe sections. The straight pipe section with 1% accuracy is much shorter than ordinary products, as shown in the figure below. Repeatability was 0.1%. Due to the small pressure loss, the wear on the probe is small, and as long as the installation is suitable, the high precision can be maintained for a long time. Low operating cost: Due to the small pressure loss, the power loss in the pipeline is small. Generally speaking, the operating cost of the uniform velocity tube is only one tenth of that of the orifice plate. Small installation workload: Because the sensor is a plug-in working method, it has the characteristics of easy installation and simplicity. For most orifices just make a small hole in the line. According to years of installation experience, it takes 5 minutes to open the hole, 20 minutes to weld the probe casing, 10 minutes to insert the fixed probe, 5 minutes to install the three-valve manifold, 10 minutes to install the differential pressure transmitter, and 10 minutes to wire. The whole process only takes about 60 minutes. minutes (integration). Free choice of integrated/separate installation: Deltaba's probe is an integrated probe in the whole sense. Whether the measured medium is gas or liquid, or high-temperature superheated steam, it can measure differential pressure probe, temperature and pressure. And the differential pressure transmitter is installed on a probe, there are more than 10 kinds of connection methods (choice) between the probe and the differential pressure transmitter, there are condensers for superheated steam, and there are condensers for direct connection to the transmitter. The oval flange also has a simple R1/2″ external thread, providing various connections for split/integrated installation, which can meet various needs. For superheated steam, most products require split installation, and users must configure their own condensate Condenser and other accessories. Detabar is supplied together with condenser, globe valve or ball valve, which is safe, reliable, simple and feasible. It is a real integrated probe. The hole is large and not easy to block: for flue gas measurement or gas with particles/ Liquid measurement, the problem of clogging is the concern of most users. If the dust in the medium is not more than 130mg/m3, the probe of Delta Bar does not need any maintenance and purging. From the point of view of fluid mechanics, any For a wedge with a shape, fluid accumulation will occur at the front end, which will increase the pressure and reduce the pressure after the wedge. No matter how high the high pressure and how small the low pressure is, the dust in motion may enter the hole in the wedge. When , due to Brownian motion, the dust will enter the hole in the wedge. So the problem is not about the pressure level or any kind of cross section, but how to make the dust come out and not accumulate. Undoubtedly, regular purging is a solution 。Our company has done a lot of research on the distribution and pore size of the holes on the probe. The large pore diameter (8 mm) is easy for foreign objects to enter and exit; Undoubtedly, it will be difficult to enter and exit, and entry is absolute, and how much is only a matter of time. The above is the entire content of this article. You are welcome to inquire about the flowmeter selection and quotation of our manufacturer. The principle and structure of the table'

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