The Annubar flow meter does not have a medium flow to display the flow rate

Here are some of the well-known brands recognized in the flowmeter industry that are widely recognized and have a great reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

Feature 1: Annubar flowmeter can be used for flow measurement of various media such as liquid, gas and steam flow;

2. The structure of Annubar flowmeter has small pressure loss, easy installation and disassembly, and small maintenance;

3. It is suitable for flow measurement of large pipelines and irregular pipelines;

4. The pressure loss is small (compared with the orifice plate, it is only less than 5% of the orifice plate), which greatly reduces the power consumption and has a significant energy-saving effect.

5. Integrated structure, good completeness;

6. The pipe diameter is suitable for a large range, and when the pipe diameter is larger, the plug-in structure is adopted, and its superiority is more prominent;

7. Good accuracy and long-term operation stability, with an accuracy of up to 1 and a degree of stability;

8. Multi-parameter intelligent transmission, automatic compensation of full dynamic temperature and pressure. It is not affected by pressure and temperature changes.

9. On-site indication and remote EasTone telecommunication are compatible, which is convenient for system formation and network access.

10. Open digital platform, multi-purpose serial door. Fieldbus structure, HART communication protocol.

Measuring principle. Annubar flowmeter, it is a hollow metal rod inserted into the pipe along the diameter, there are pairs of pressure measuring holes in the direction of fluid flow, generally two pairs, its shape is like a flute. The multi-point pressure pore on the frontal surface measures the total pressure, which is connected with the full pressure pipe to draw out the average full pressure P1, and there is a pressure hole in the center of the backflow surface, which communicates with the static pressure pipe and leads to the static pressure P2. Annubar measures the flow rate by measuring the difference between the total pressure and the static pressure of the fluid.

Main technical parameters:

1. The range ratio is 20:1

2. General pipe diameter: 8mm 8000mm;

3. Measurement accuracy: ;

4. Repeatability: ;

5. Working pressure: 0 40MPa;

6. Working temperature: -100 800;

7. Applicable medium: air, gas, flue gas, natural gas, tap water, boiler feed water, corrosive solution; Saturated steam, superheated steam, etc.

8. Reference standards: ISO 3966-197, JB T5325-1991 and GB T2624-2006

9. Connection: plug-in flange connection, plug-in threaded connection, pipeline flange connection, pipeline threaded connection.

1. Connect the signal cable and power cable.

2. Open the inlet and outlet valves, and the opening of the inlet and outlet valves should be consistent.

3. Open the stainless steel three-valve group balance valve, slowly open the valve at the high and low pressure end of the orifice, and close the stainless steel three-valve group balance valve after the fluid passes through the flowmeter.

Installation conditions: (1) The straight pipe section before and after the throttle must be straight, and there must be no visible bend.

2) The straight pipe section used for the installation of throttles should be smooth, if it is not smooth, the flow coefficient should be multiplied by the roughness to correct the sparseness.

3) In order to ensure that the flow of the fluid is formed 1 d before the throttle to form a fully developed turbulent velocity distribution, and this distribution is made into a uniform axisymmetric shape, so.

1) The straight pipe section must be round, and the roundness of the first 2D range of the throttle is required to be very strict, and there is a certain roundness index. Specific measurement methods:

a) On the 4 vertical pipe sections of OD, D 2, D and 2D before the throttle, at least the single measured value of the inner diameter of the 4 pipes is measured at an angular distance of the same to equal, and the average value D is taken. The difference between the single measured value and the average value of any inner diameter shall not be exceeded

b) After the throttling parts, 8 single measured values of the inner diameter are measured by the above method at the OD and 2D positions, and the maximum deviation of any single measured value compared with D shall not exceed 2%.

2) A long enough straight pipe section is required before and after the throttle piece, and this long enough straight pipe section is related to the form of the local resistance part before the throttle and the diameter ratio. (4) the length of the straight pipe section between the first resistance member and the second resistance member on the upstream side of the throttle can be taken according to the form of the second resistance piece and = regardless of what the actual value is) take 1 2 of the listed value

5) When the upstream side of the throttle is an open space or a large container with a diameter of 2d, the length of the straight pipe between the open space or the large container and the throttle shall not be less than 30d (15d). If there are other local resistance parts between the throttle and the open space or the large container, the total length of the straight pipe section from the open space to the throttle shall not be less than 30d (15d) in addition to the minimum length of the straight pipe section 1 between the throttle and the local resistance piece.

Bituba flowmeter: It is a flowmeter based on the pitot tube principle that measures the flow rate in the center of a medium pipeline.

Annubar flowmeter (also known as flute-shaped average velocity tube flowmeter) is a new type of differential pressure flow detection element developed according to the principle of pitot tube velocimetry, which outputs as a differential pressure signal, and is used with instruments and meters to measure differential pressure, which can accurately measure the flow rate of a variety of liquids, gases and steam (superheated steam and saturated steam) in circular pipelines and rectangular pipelines, and gradually replace orifice plates and other detection components with its advantages of high accuracy, small pressure loss and easy installation, in the power industry (including nuclear industry) and chemical industry, petroleum and metal smelting and other industries.

The average velocity tube flowmeter is generally suitable for DN20 to DN12000 (mm), which has the advantages of simple structure, small pressure loss, easy installation and disassembly, and small maintenance. For gas measurement, gas flow rates greater than 4 m3 h can be detected if supported by a microdifferential pressure transmitter. In terms of installation, if it is a vertical pipeline, it should be installed at a position of 360° along the circumference of the pipeline, on the horizontal pipeline, the liquid flow meter should be installed below the level of the center of the pipeline, and the gas flow meter should be installed above the horizontal center of the pipeline.

Determine the installation position on the original pipeline, drill the hole, weld the connecting flange attached to the flowmeter, and then fix the flowmeter, pay attention to the total pressure hole on the sensor detection rod to be positive to the flow direction, and the deviation is not greater than plus or minus 7 °. Annubar flowmeter is mainly used for batch processing and continuous measurement of various energy sources such as liquids, fuel gases, vapors and gases in industrial processes, with high stability and repeatability. Compared to other forms of flow meters, Annubar flow meter series products are easier to install.

Annubar flow sensors can also complete reliable measurements under harsh environmental conditions, and have obvious advantages in the flow measurement of easily vaporized media.

The Annubar flowmeter is based on the principle of differential pressure parameter velocity measurement, equipped with a high-performance differential pressure flow transmitter, and carries out various steam. internal air. Argon gas.

Flue gas. Oxygen. Nitrogen.

Coal gas. Liquid and other media flow rate, precise model structure process flow sensor, with anti-corrosion. Vibration resistant...

High temperature resistance. High pressure resistance. Anti-clogging function.

It is an ideal measuring instrument with high cost performance. Please call Ken Technical Services**; 4008203035.。At the same time, we provide you with scheme design

Standard selection. , complete supply services.

1. The Annubar flow sensor is through the tube.

The average flow velocity of the channel is multiplied by the effective cross-sectional area of the pipe to determine the flow rate.

2. The detection rod of the sensor is composed of a hollow metal pipe, and multiple pairs of total pressure holes are drilled on the frontal surface, which are respectively located in the first place of each unit area, which reflects the flow velocity in each unit area.

3. Since the total pressure holes are connected, after the total pressure value of each point in the detection rod is averaged, the total pressure is led from the lead pipe to the high-pressure joint and sent to the positive pressure chamber of the sensor.

4. There is a detection hole on the back or side of the sensor, which represents the static pressure of the entire section. The electrostatic outlet tube 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 rate is obtained.

Annubar flowmeter is a kind of velocity flowmeter that uses the principle of hydrodynamic pressure

The energy with which a fluid in motion keeps its flow is called kinetic pressure energy. The dynamic pressure energy of the fluid is related to the flow velocity, and the dynamic pressure energy of the fluid will be converted into dynamic pressure acting on the object that changes the motion state of the fluid, and the flow rate can be obtained by detecting the force on the object or directly measuring the dynamic pressure, and then the flow value can be obtained.

The probe of Annubar flowmeter is a cylinder with holes on both sides of the cylinder, which is actually quite a tube with two side holes, and the opening of the hole to the flow beam can feel the dynamic pressure + static pressure of the fluid, and the hole of the back to the flow beam feels the static pressure, and the square of the pressure difference between the two tubes is proportional to the flow rate (flow).

Since the flow velocity is not open at various points in the pipe, multiple holes are used to obtain an average flow rate. Therefore, the Annubar flowmeter is also known as a constant velocity tube and a flute tube.

Annubar flowmeter generally refers to the average velocity pipe flow sensor is developed based on the principle of pitot tube velocimetry, which is determined by the product of the average flow rate of the pipeline and the effective cross-sectional area of the pipeline It outputs a differential pressure signal, which is used with instruments to measure the differential pressure to achieve flow measurement As shown in the figure below, the average pressure difference measured by the analysis is finally displayed as the flow rate.

The main difference is the probe part, the probe structure of Annubar has two types: circular and diamond-shaped, as shown in Figure (a) and (b) below.

The probe of Weiliba is a high-strength single-piece double-cavity impermeable structure, the low-pressure pressure hole is located on both sides, and the positive and negative pressure holes are designed in multiple groups. See figure (c) above

Compared with the anti-blocking effect of Weiliba, it is good.

In the mid-60s, the average velocity tube (bar) flow sensor was first developed by Dieterich Standard Inc in the United States based on the principle of conservation of energy (Daniel Bernouli) and pitot tube (Pitot tube) velocity measurement.

In the middle of the 80s, with the emergence of intelligence, digitization and miniaturization of differential pressure transmitters, especially the stable performance and continuous improvement of the accuracy of micro differential pressure transmitters, it has laid a solid foundation for the application of flow sensors for average velocity tubes (bars). With the in-depth research of some foreign companies on the detection technology of the average velocity tube, the cross-sectional shape, surface treatment, material, number of openings, and installation accessories of the detection rod have been continuously improved, and the flow sensors of the average velocity tube (bar) with different names have been launched, including Verabar, American Veris, Deltabar, Torbar, British Toba Flowmeter Company (TFL), Itabar (Itabar) and so on.

Because the flowmeter has the characteristics of simple structure, no movable and vulnerable parts, low cost, easy maintenance, high stability, high reliability and low operating cost, it has been popularized and applied in the monitoring of work and production, especially in large-diameter gas metering occasions.

The accurate name of the bar flowmeter is the average velocity tube flowmeter, which is called a certain bar flowmeter when referring to the product of a company.