Flow meter manufacturer from China（Kaifeng AFT Instrument Co.,ltd)

In order to reduce pollution, water saving and emission reduction must be measured and controlled strictly for domestic water, industrial water, circulating water and discharged sewage. Flow measurement plays an important role in the total quantity control, quota management and petrochemical production and process control of water resources. The main water supply plant of circulating water in coal chemical plant, the operation of the water supply device is very important to the whole plant production and environmental protection. Sewage treatment capacity and treatment quality is an important indicator of the water supply device, if the processing capacity is low can not meet the requirements of the whole plant water, if the treatment of low quality can not meet the emission requirements. The water outlet capacity and economic benefit of mine water are investigated mainly by 3 flow indices, that is, the inflow of coal, the clarification of flow and the amount of sludge outflow. Conside...

In order to make the industrial expansion and flow meter application process, the technology develops and produces the accuracy of the electromagnetic flowmeter, in the same industry of water supply, off balance, plate loss, user acceptance test is 1, especially the traditional concerns do not meet their needs. Therefore, I think the electromagnetic flowmeter and the manufacturer's application to replace the traditional off-line test method, and has an on-line electromagnetic flowmeter test method. In the factory control system, field equipment (sensors and actuators) to ensure product quality is one of the important factors. Automatic control system to improve the field equipment, which is a large number. Setting and drifting complex control system equipment failures, in many cases, led to the system's continuous response quickly finding fault meters, difficult to recover. The instrument drift signals over the front of the signal drift, which is a step-by-step process limitati...

The velocity distribution of the electromagnetic flowmeter symmetrically distributes the tube axis, generating the total fluid flow of the electrodes in 1 uniform electric forces, the flowmeter's liquid flowmeter's average fluid velocity distribution of the amplitude magnetic field rate, but not the ratio. The axis of symmetry, that is, the particles of the moving object, each of the different positions of the electrode shape of the induction electromotive force depends on the electrode electrode, at the particle velocity is greater, closer, the induction electromotive force larger scale, the resulting is different, therefore, you need to ensure fluid flow of the symmetrical axis. Will cause an error, such as the distribution of non axisymmetric pipe flows. Electromagnetic flowmeter options to ensure straight tube requirements to minimize errors. If you want to know more, welcome to visit our website: www.aft-flowmeter.com

The operating conditions or operating conditions of flow meters directly affect their metering performance, and the most direct effect of operating pressure or temperature change on the flow meter is the change of the measurement chamber. The indirect effect of electromagnetic flowmeter is the change of physical parameters such as viscosity and density of the medium, but the indirect effect can be considered when modifying the physical property. Due to the complexity of flow meter and the discretization of machining assembly, it is almost impossible to use the method of calculation to correct the change of the cavity with the operating condition, and it is impossible to fit the empirical formula to meet the accuracy requirement according to the test data. Turbine flowmeter for Volumetric flowmeter, in the flow meter type identification, prototype test or quality inspection, natural getter engine was converted into a booster engine, whether the use of exhaust gas turbocharger or mechani...

1. Daily Maintenance ◆  Only to the instrument for periodic intuitive inspection, check the environment around the instrument, remove grime, to ensure that no water and other substances, check the wiring is good, check whether there is a new installation of strong electromagnetic field equipment or new wires across the instrument. ◆   If the measurement medium is easy to stain the electrode or in the measurement tube wall sedimentation, scaling, should be regularly made to clean, cleaning. 2. Trouble finding Flowmeter started operation or normal operation for a period of time to find that the instrument work is not normal, should first check the external conditions of the flowmeter, such as whether the power supply is good, whether the pipeline leakage or in the state of not full pipe, whether there are bubbles in the pipeline, the signal cable is damaged, the converter output signal (that is, the back-position meter input loop) whether open. Remember to blindly disassemb...

Orifice flowmeter in situ measurement, often due to some objective factors, resulting in large error measurement results, the following is to introduce the main measures to ensure the orifice flowmeter measurement accuracy: 1.the orifice-plate flowmeter is calibrated on a per-stage basis. As we all know, standard orifice as long as the design and manufacture of reference to relevant standards, do not need real stream can be directly used. Because the outflow coefficient can be directly calculated by the software, but computer computing after all the more ideal, and the scene environment still has a certain difference, so, in order to ensure the measurement accuracy, it is recommended that each flowmeter for the real stream, the calibrated outflow coefficient and calculation results are compared, calculated travel value, to amend. 2.the Reynolds number is corrected, the flow coefficient of orifice flowmeter and Reynolds number have a definite relation, when mass flow rate changes, the R...

To ensure that the required measurement accuracy is achieved, the following points need to be noted:  1. flowmeter must be installed vertically, the flow flow from the bottom of the flowmeter, and the verticality is superior to 2°, horizontal installation of the horizontal angle is better than 2°;  2. Metal tube Floater flowmeter should be added bypass, easy to handle failure and blow washing does not affect production;　 3. Flowmeter entrance should be 5 times times the length of pipe diameter above the straight pipe, the export should be 250mm straight pipe;  4. The medium contains ferromagnetic material, should install magnetic filter;　 5. The medium contains solid impurities, should consider in the valve and straight pipe between the installation of filters; 6. For gas measurement, should ensure that the pipeline pressure is not less than 5 times times the pressure loss of flowmeter to make the float stable work;  7. The measured medium temperature is above 220 ℃ ...

1. DC Excitation Technology: The use of permanent magnet or DC power supply to the electromagnetic flux sensor excitation winding power supply, to form a constant excitation magnetic field. It has the characteristics of simple and reliable method, small influence by power frequency interference and small self inductance phenomenon in fluid. However, the biggest problem is that the DC induction potential on the surface of the two electrodes to form a fixed positive and negative polarity, will cause the measured medium of electrolysis, resulting in the electrode surface polarization phenomenon. The existence of this phenomenon will increase the effective resistance between electrodes, the electrode polarization and potential drift, and seriously affect the signal conversion put most of the work. 2. The power frequency sine wave excitation technology: is uses the work frequency 50Hz sine wave electricity supply to the electromagnetic flux sensor excitation winding power supply, causes it ...

First, the market scale of flow meter: Flow meter is a kind of instrument with a strong dependence on the use of conditions, in the actual measurement environment in the field can be measured with the stability of the medium, pressure, bubble content and other factors, the accuracy of the instrument is affected. Therefore, because of the diversity of the measurement medium, it also determines the diversity of the flow meter. But from the overall point of view, from the measurement principle, can be divided into area (speed type), volume and quality of three kinds. Second, the flow meter market growth: According to Mir's research, although the economic environment was depressed in the fourth quarter of 2008, the flow meter industry continued to grow by 8.4% in the year to 08. The order amount was increased from 3.1 billion yuan in 2007 to about 3.4 billion yuan in 2008. One of the traditional instruments (throttling, volume, turbine, rotor flowmeter, etc.) growth significantly slowe...

Installation Requirements: 1.As far as possible to avoid the measurement tube into negative pressure; 2. When measuring the mixed phase fluid, choose the place which does not cause the separation, when measuring the two-component liquid, avoid to be packed in the downstream of the mixture not yet evenly, and when measuring the chemical reaction pipeline, it should be installed downstream of the fully completed section, and the straight pipe sections are not less than 5 D and 2D: 3. Avoid the vicinity of large motors, large transformers and so on, so as not to cause electromagnetic interference; 4. Select a small vibration of the site, especially for integrated instrumentation; 5.E asy to realize the isolated grounding of the sensor; 6. Avoid direct sunlight as far as possible; 7. As far as possible to avoid the surrounding environment with high concentrations of corrosive gases. Operating principle of submersible electromagnetic flowmeter: 1.The submersible electromagnetic flow senso...

Stainless Steel Electromagnetic flowmeter principle: is based on Faraday law of electromagnetic induction: conductive liquid in the magnetic field for the cutting of magnetic lines in the movement, the conductor generated inductive potential, its inductive potential E: E=KBVD, type: k---meter constant b---magnetic induction v---Average flow rate d---pipe diameter Characteristics of stainless steel electromagnetic flowmeter: 1. Flow measurement is not affected by the density of flow, viscosity, temperature, pressure, and conductivity changes, sensor-induced voltage signal and the average flow rate is linear relationship, so the measurement accuracy is high. 2. Measurement of open flow in the pipeline, so there is no additional pressure loss, measuring the pipeline without removable parts, so the sensor life long. 3. The sensor needs a short straight pipe, easy to install. 4. The sensor part only has the lining and the electrode and the measured liquid contact, as long as the reasonable ...

Innovation is the soul of all progress, all walks of life are inseparable from the development of innovation, instrumentation industry has a keen sense of smell and insight, but also need innovation to support. and the current instrumentation industry in the innovative still has obvious deficiencies, for the road of innovation is still in a state of confusion, then instrumentation enterprises how to innovate? Industry innovation is not enough, with the enterprise's lack of innovative awareness and can not be based on long-term interests have a great relationship. Want to innovate, the first idea needs to change, otherwise everything is empty talk, not only can not promote enterprise development, and in the longer term will also reduce the competitiveness of enterprises in the market. Innovation can bring long-term benefits, but its early investment, long period of research and development, high risk and so on, so that enterprises can not really focus on innovation, leading to the p...

V-cone flowmeter when measuring steam flow, and conventional flowmeter installation has many different places, because the particularity of the steam, must pay attention to the installation of the problem, otherwise, not only the V-cone flowmeter itself can not work, but also serious will cause the risk of on-site technology. (Once low in 05, there is a customer response that a factory purchased a DN300 V-cone flowmeter in situ measurement, the leak occurred, fortunately did not occur explosion. below to introduce how to ensure accuracy and safety on the basis of the installation of flowmeter: 1. Before installing, must check the Flowmeter packing list, the control factory calculates the book to examine the V Cone Flowmeter's opening and the differential pressure transmitter's range, second is to guarantee the field straight pipe length. 2. Correct use of gaskets, the appropriate specifications of the screw nut, spring pad, symmetrical force gradually tightened to ensure that t...

In order to select the most suitable standard throttle device, the selection should be considered from the following aspects: ①  The limiting conditions of the diameter ratio and the Reynolds number range; ② measurement accuracy; ③ allowable pressure loss; ④ The shortest straight pipe length required ; ⑤ The sensitivity of to the erosion, wear and stain of the tested medium; ⑥  The complexity and price of the structure; ⑦ The convenience of installation; ③ Long-term stability of use. According to the above aspects, the standard throttle device selection principle can be summed up as the following points. ① standard throttling Device the size, diameter ratio and Reynolds number range of various types of throttle applications are limited in the national standard GB 2624-93 (or international standard ISO 5167-1), for example, the orifice plate can be applied to a larger diameter range than the nozzle and venturi nozzle, Different types of classic venturi tube diameter range of l...

Plug-in electromagnetic installation without water and can be installed with pressure, this can not delay the whole plant production and can meet the requirements of the factory (precision). Besides the characteristic of general electromagnetic flowmeter, the plug-in electromagnetic flowmeter has its own unique advantages: 1. Simple structure, no movable parts, long service life; 2. Small size, light weight, easy installation, small maintenance; 3. There is a cut-off valve inserted electromagnetic flowmeter to achieve a stop-flow can be installed disassembly, user-friendly maintenance, repair; 4. The measurement is not affected by the material of the pipe being measured; 5. No lining required, no grounding ring required. If you want to know more, welcome to visit our website:  www.aft-flowmeter.com

(1) According to the expression of the error 1. Absolute error: The difference between the measured value of the measured parameter and the true value, and the absolute error directly indicates that the meter measurement value deviates from the actual size. For the same actual value, the absolute error of the measurement is small, then the measurement result is shown to be accurate. However, the absolute error can not be compared with the measurement quality of the same instrument with different range, nor can it be compared with the measurement quality between different types of instruments, because the absolute error of different dimensions cannot be compared. 2. Relative error: The absolute error of the measured parameter is expressed as a percentage of the measured truth ratio. 3. Citation error: The absolute error is expressed as a percentage of the meter range ratio. (2) According to the occurrence of the error is divided into 1. System error 2. Random error 3. Negligence Error ...

     The electromagnetic flow meter works based on Faraday's law of electromagnetic induction. In the electromagnetic flow meter, the conductive medium in the measuring tube is equivalent to the conductive metal rod in the Faraday test, and the two electromagnetic coils at the upper and lower ends produce a constant magnetic field. When a conductive medium flows through, an inductive voltage is generated. The two electrodes inside the pipe measure the induced voltage. The measurement pipeline is electrically isolated from the fluid and the measuring electrodes through a non-conductive lining (rubber, Teflon, etc.). Please contact us ,if you want to learn more:  www.aft-flowmeter.com

Split electromagnetic flow meter measurement principle is based on Faraday law of electromagnetic induction, separated electromagnetic flow meter consists of sensors and converters, sensors installed in the measurement pipeline, the converter is installed in 30 meters away from the sensor or within 100 meters of the occasion, between the two shielded cable connection. The main components of the split electromagnetic flow meter are: measuring tube, electrode, excitation coil, iron core and magnetic yoke shell. It is mainly used to measure the volume flow in the conductive liquid and slurry in the closed pipe. such as water, sewage, mud, pulp, all kinds of acid, alkali, salt solution, food slurry, etc., widely used in petroleum, chemical, metallurgy, textile, food, pharmaceutical, paper and other industries as well as environmental protection, municipal management, Water conservancy construction and other fields to measure high temperature, high humidity, inconvenient to observe. If yo...

The electromagnetic flow meter should be used carefully to measure the liquid medium of crystallization, as the pipeline conveying fluid has a good thermal insulation, in the heat preservation work will not crystallization, but the electromagnetic flow sensor measurement tube difficult to implement with thermal insulation, therefore, the flow through the measurement tube is easy because of cooling caused by the inner wall knot a layer of solid. Due to the use of other principles of flow meter measurement also has a crystallization problem, so in the absence of other better methods, the measurement tube length is very short of a "ring" (oring) electromagnetic flow sensor, and the flow meter upstream pipeline with thermal insulation to strengthen. In the pipeline connection method, consider the flow sensor disassembly and disassembling conveniently, once the crystallization can easily remove the maintenance. It is not uncommon to have an electromagnetic flow meter that is not w...

First, the industrial production process. Flow meter is a process automation instrumentation and equipment in one of the large categories, it is widely used in metallurgy, electricity, coal, chemical, petroleum, transportation, construction, textile, food, medicine, agriculture, environmental protection and people's daily life and other national economic fields. Second,Energy metering. Energy is divided into primary energy (coal, crude oil, coalbed methane, LPG and natural gas), two energy (electricity, coke, artificial gas, refined oil, liquefied petroleum gas, steam) and carrying energy (compressed air, oxygen, nitrogen, hydrogen, water) and so on. Third, environmental protection projects. The emission of flue gas, waste liquid, sewage and so on seriously pollute the atmosphere and water resources, and seriously threaten the human living environment. The State has made sustainable development a national policy and environmental protection will be the biggest issue in the 21st cen...

The measurement of low-temperature medium is that the transmitter is limited by two convenient, one is the low-temperature performance of the material, the second is the electrical insulation of the transmitter. For general-more than 20 degrees of media, such as frozen brine, usually the transmitter lining materials can be used. But the use of PTFE material is, PTFE thermal expansion and contraction is more serious. Easy to make electrodes leak. The main problem in measuring cryogenic media is the electrical insulation of the transmitter. When the measurement tube is filled with a flowing low temperature medium, it is easy to take place in the measurement of the outer wall of the tube and the condensation water droplets or condensation frost in the transmitter. In this way, the insulation resistance between the signal circuit, the excitation circuit and the casing is reduced, even short circuit. In this case, we can seal the shell with a resin or sealant. The use of transducer shell fi...