Abstract: the scale vortex flowmeter in electromagnetic field how to isolate information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. The blocking problem of the magnetic field, is a practical problem with theory significance and meaning. According to different conditions, the screen can be divided into the electrostatic shielding of electromagnetic field, static magnetic shielding and electromagnetic shielding, three kinds of circumstances, the three situation has both qualitative difference, again. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a scale vortex flowmeter in electromagnetic field how to isolate the article details. The blocking problem of the magnetic field, is a practical problem with theory significance and meaning. According to different conditions, the screen can be divided into the electrostatic shielding of electromagnetic field, static magnetic shielding and electromagnetic shielding, three kinds of circumstances, the three situation has both qualitative difference, but also has internal, not confusion. Electrostatic shielding in static balance state, whether it's hollow conductor or solid conductor; No matter how much charged conductor itself, or whether the conductor in electric field, equipotential body, for its internal field intensity is zero, this is the basic theory of electrostatic shielding. Because the electric field inside the closed conductor shell has the typical significance and practical significance, we closed conductor shell electric field, for example make some discussions on the electrostatic shielding. （ A) Closed conductor shell internal electric field is not affected by an electric charge or shell electric field. Such as charged body and the shell outer shell has a charge q, electrostatic induction make shell outer wall charged. Electrostatic equilibrium when no electric field in the shell. This is not to say that an electric charge which produces an electric field is not in the shell, shell root farms. Due to a different shell outer wall induced charge, with q in the enclosed space as a stimulating and field strength is zero. Thus conductor inside the shell of an electric charge q from shell or other the influence of electric field. Shell and the outer wall of the induced charge on the automatic adjustment. If the above cavity enclosure grounding conductor, the shell induced positive charge will be along the earth wire into the underground. Electrostatic balance cavity after conductor and earth potential and field intensity remains in the cavity is zero. If the cavity with charge, the cavity conductor and equipotential, still no electric field in the conductor. At this time due to the cavity wall has a different number induced charge, so the cavity with electric field. The electric field generated by the shell charge, an electric charge shell still no influence of electric field inside the shell. By what has been discussed above, the closed shell no matter the grounding conductor or not, the internal electric field is not affected by an electric charge shell. （ 2) A closed shell conductor external electric field is not affected by the influence of shell charge. If there is a charge q shell cavity, because of electrostatic induction, the inner wall of the shell with a charge amount of different, shell outer wall with the same number with charge, shell outer space electric field exists, the electric field is produced by shell charge q indirectly. Also can saying is generated by the outside shell induced charge directly. But if the earthing, shell electric charge will disappear and the shell and the lining of induction electric charge q charge outside the shell to produce electric field is zero. Visible if you want to make the shell can not influence the charge of an electric field on the shell, shell must be grounded. This is different from * case. Here also must pay attention to: (1) we say that earth will eliminate shell electric charge, but is not to say that in any case shell outer wall must be electrically neutral. If have charged body outside shell, shell may still be charged on the outer wall, regardless of whether there is charge inside the shell. (2) the actual application of the metal shell don't have to be strictly completely closed, with a metal net instead of metal shell also can achieve similar electrostatic shielding effect, while the screen is not a complete and thorough. (3) in static equilibrium, is without charge flow in the earth wire, but if the blocked shell charge change over time, or the shell near the outside of the charged body charge change with time, makes the current in ground wire. Shield also possible residual charge when the shielding effect and is not completely and thoroughly. In short, closed shell no matter the grounding conductor or not, the internal electric field is not affected by shell electric charge and electric field; A closed shell conductor electric field is not affected by shell charge. This kind of phenomenon, called electrostatic shielding. Electrostatic shielding the meaning of two aspects: one is the real meaning: shielding metal conductor shell instrument or working environment is not affected by external electric field, or an external electric field. Some electronic devices or measuring equipment for interference cancellation, all want to practice the electrostatic shielding, such as indoor high voltage equipment hood grounded metal hood or relatively dense metal net, electronic worked metal shell. And as a full-wave rectifier or bridge rectifier power transformer, between the primary and secondary windings wound a layer of metal chips on the package or enameled wire and grounding, shielding effect. In the high voltage live working, workers put on a metal wire or conductive fibers are brought, can shield effect to human body. In the static experiments, because there are about 100 v/m near the earth vertical electric field. To exclude the electric field research on the role of electronics, electronic under gravity movement only, you must have the eE < Meg, can calculate E < 10 - 10 v/m, this is a little electrostatic field & other; Electrostatic vacuum & throughout; , this is only to into the vacuum cavity of electrostatic shielding can be achieved. In fact, from a closed cavity conductor implementation of electrostatic shielding is very effective. The second is theoretical significance: indirect validation of coulomb's law. Gauss theorem can be derived from coulomb's law, if the index of the inverse square of the coulomb's law is not equal to 2 out gauss theorem. On the other hand, if the gauss theorem, prove the correctness of the coulomb's law. Based on gauss theorem, insulated metal ball shell internal field strength should be zero, which is the conclusion of electrostatic shielding.
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Abstract: the scale vortex flowmeter for steam metering matters should be paid attention to the information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Vortex flow meter used in steam metering matters should be paid attention to are divided into saturated steam and superheated steam, in general, manufacturers will give saturated vortex flowmeter, superheated steam mass flow rate range table for user selection, in order to determine the diameter size. For overheat steam. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a scale vortex flowmeter for steam metering matters should be paid attention to the article details. Vortex flow meter used in steam metering matters should be paid attention to are divided into saturated steam and superheated steam, in general, manufacturers will give saturated vortex flowmeter, superheated steam mass flow rate range table for user selection, in order to determine the diameter size. For superheated steam to compensate the temperature and pressure, in the true sense of saturated steam temperature or pressure compensation, according to temperature and pressure when measuring density check table to ensure the required quality traffic. Due to the condition changes, when actual measurements of saturated steam and superheated steam may deviate from the original state of design, makes the usually by steam temperature and pressure to calculate its density change, the relationship between affect measurement accuracy. 1. In superheated steam flow computing devices according to the density of superheated steam temperature and pressure look-up table to calculate the mass flow rate, but when the superheated steam after long distance transmission, or due to improper measures of pipeline insulation, often because of the temperature to reduce the heat loss from overheating state into the critical saturation state, and even some steam condense into droplets by a phase change, then become wet saturated steam ( Too full steam) 。 The output of the vortex flowmeter with only through the measuring tube is directly proportional to the fluid velocity, when moisture saturated steam, water droplets on the influence of vortex street flowmeter output negligible, so you can think of vortex street flowmeter output entirely by various steam dry wet full part ( Saturated part) Caused, and the density of dry part according to pressure or temperature compensation pinpointed. Steam metering part if the two sides agreed by steam when clearing fees, condensed water not to collect fees, the phase transition to measure the impact of small, can be ignored. If also in accordance with the steam condensed water fee, the vortex street flowmeter measurement results on the low side. 2. Wet saturated steam after the vortex flow meter installed in the pressure reducing valve, wet saturated steam suddenly significantly reduced pressure, fluid of adiabatic expansion, the droplets evaporate part, absorb heat of vaporization from the liquid and vapor phases at the same time, the lower the temperature of liquid, if the temperature is lower much or evaporates before humidity is higher, can make the temperature down to rapid and new pressure of the saturated temperature, establish a new equilibrium, steam is still the saturated steam at this moment, if the pressure to reduce a lot or evaporates before humidity is low, due to water evaporation and the lower the temperature is still higher than new pressure after the corresponding saturation temperature, the steam into superheated steam. After the occurrence of the evaporation, the former had no effect on compensation, just dry part of the increase in steam, dry degree increases accordingly, the latter is wet saturated steam into superheated steam, then the impact on the meter points the following three conditions: ( 1) When the design has been given the steam into overheating, or difficult to determine what is the status, or sometimes is overheating sometimes is saturated state, so the temperature pressure compensation, the above phase change not influence the result of the measurement. （ 2) Design according to the saturated steam, and USES the pressure compensation, the above phase transition will lead to smaller error, namely the superheated steam temperature with saturated steam temperature difference caused by density difference of corresponding compensation error. （ 3) Design according to the saturated steam, but USES the temperature compensation, the superheated steam temperature as saturation temperature check density table, generally can cause larger error. Solve the above problem has the following three ways: ( 1) Will always steam flow meter installed in front of the pressure reducing valve, due to the steam without decompression, there is no phase change problem, so install before the pressure reducing valve, flow meter according to the compensation method for saturated steam processing, can guarantee the measurement accuracy. （ 2) If the flowmeter can only be installed behind the pressure reducing valve, can be added 1 pressure transmitter, temperature pressure compensation. （ 3) If better stability of the pressure reducing valve, flow meter can be upstream pressure value as a constant value is set to display instrument, temperature and pressure compensation. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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Abstract: how to guarantee the correct measurement of steam flow meter scale information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. A, steam density compensation to scientific and accurate in order to correctly measure the quality of the steam flow, must consider the change of steam pressure and temperature, the through flow totalizer. especially vapor density to compensate. Measuring steam temperature must be standard installation: platinum resistance temperature measurement. More flow meter manufacturers choose model price quote you are welcome to inquire, here is how to guarantee the correct measurement of steam flow meter scale article details. A, steam density compensation to scientific and accurate in order to correctly measure the quality of the steam flow, must consider the change of steam pressure and temperature, the through flow totalizer. especially vapor density to compensate. Measuring steam temperature must be standard installation: platinum resistance temperature measurement platinum thermal resistance is inserted into the pipe center position, install the platinic resistance in the downstream of the flow meter of 5 times the pipe diameter, installation position platinum thermal resistance of the pipe heat preservation measures, etc. , to ensure accurate measured temperature value. In the steam pressure measurement is important to note that if the lead pipe pressure, must be zero migration ( Because led tube condensate gravity causes pressure transducer to measure the pressure with a certain difference between the actual pressure, cause density compensation error) , but also in the inner flow totalizer. especially for correction. Pressure transmitter installed in the downstream of the steam flowmeter 4 times the pipe diameter, pressure transmitter in front of the valve, gasket should be in good condition, to ensure the accurate measurement of steam pressure. If the set pressure, temperature compensation, close to the actual value to set, otherwise the error is very big, is generally not recommended. In the flow totalizer. especially to correctly set the operation of the steam flowmeter, it is very important to correctly calculate the cost of the steam. For the use of steam condition not good judgment, the proposal USES of intelligent flow totalizer. especially with platinum resistance, pressure transmitter, temperature and pressure compensation, so that the steam mass flow rate measurement by the most accurate. Second, the field of vibration and electromagnetic interference should avoid steam measurement used in the most affected by the design principle of vortex street flowmeter, is more sensitive to mechanical vibration, vibration measurement results are susceptible to interference, the section before and after the steam flow meter should be reliable support design, equipped with vibration buffer components, such as pipeline vibration inevitably, should choose relatively strong anti-jamming capability of the steam flowmeter ( Such as gas ultrasonic flowmeter, the intelligent type vortex flowmeters, differential pressure flowmeter, etc. ) 。 If the steam flowmeter exists vibration interference, will use the vortex street on the steam flow meter low frequency pulse signal, the steam flowmeter will these pulses, as flow signals to flow totalizer. especially cumulative flow formation, cause vortex steam flowmeter in a period of time without the aid of steam still have accumulated a certain amount of number. This is & other; Without the steam flowmeter go words throughout the &; Reasons, so in the case of without steam, steam users also want to remember good table together with steam supply unit, prevent steam flowmeter & other; Short run & throughout; 。 Three, the steam flow meter range than the reasonable range than refers to a flow meter in can ensure the accuracy of a given range, can measure the ratio of the maximum flow and minimum flow. User to choose according to their actual usage flowmeter, in theory for the steam flowmeter range to completely cover the user's use. More than traffic cap and use below cut-off flow can cause serious no steam flowmeter measurement. Such as: the actual average flow rate for 5 t/h steam flowmeter, vortex street generally should choose the diameter is 150 mm vortex flowmeter, but when the flow down to zero. 3 t/h or more than 15 t/h, the meter will appear serious measurement phrase. Four straight pipe upstream and downstream of the correct installation, steam flowmeter for traditional vortex flowmeter, the straight pipe installation requirements respectively before and after 20 times the pipe diameter and 5 times the pipe diameter ( This is the front of the flowmeter without obstacles such as valve technical requirements; There are obstacles to increase the straight pipe, specific see illustrations of the manufacturer) 。 If the upstream and downstream straight pipe is not enough, will cause the pipe steam flow has not fully developed, the distortion in the velocity distribution profile. Users can pass before the steam flowmeter installation or increase the straight pipe flow regulator to adjust the velocity distribution of the pipeline, the steam flowmeter in the state of fluid for the full development. For some large diameter steam flowmeter, satisfy the requirement of the upstream and downstream straight pipe installation is more important. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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Abstract: Talking about the advantages and limitations of vortex flowmeters The information is provided to you by excellent flowmeter and flowmeter manufacturers. The working principle of the vortex flowmeter is to set a vortex generator in the fluid, so that regular vortices are alternately generated on both sides of the generator, and the vortex columns are arranged asymmetrically downstream of the vortex generator to generate a certain frequency. St*v/(1-1.27d/D). More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article discussing the advantages and limitations of vortex flowmeters. The working principle of the vortex flowmeter is to set a vortex generator in the fluid, so that regular vortices are alternately generated on both sides of the generator, and the vortex columns are arranged asymmetrically downstream of the vortex generator to generate a certain frequency. St*v/(1-1.27d/D)*d, (St is the Strouhal number, which is a dimensionless number and is related to the vortex generator and Reynolds number; v is the flow velocity; d is the oncoming width of the generator; D is the nominal diameter) to get the flow rate. In general, the output signal (frequency) of the vortex flowmeter is not affected by changes in the physical properties and components of the fluid, which means that the meter coefficient is only related to the shape and size of the vortex generator and the Reynolds number. Its advantages are: simple and firm structure, easy installation and maintenance; suitable for various types of fluids, such as liquid, gas, steam and some mixed phases; high accuracy, generally up to±About 1%R; wide flow range, up to 10:1 or 20:1 or more; small head loss; no zero drift; relatively cheap price; disadvantages are: not suitable for low Reynolds number Re<20000 The use of high viscosity, low flow rate, and small diameter is limited; the requirements for the environment are high, and places with vibration should be avoided as much as possible, and a long straight pipe section is required on the upstream side; the instrument coefficient is low, and the larger the diameter, the lower. The signal resolution is reduced, so the aperture should not be too large, generally used in DN15~DN300mm. 1. Advantages VSF has a simple and firm structure, and is easy to install and maintain (compared with throttling differential pressure flow meters, it does not require pressure guiding pipes and three-valve groups, etc., reducing leakage, blockage and freezing, etc.). Suitable for many types of fluids, such as liquids, gases, vapors and partially miscible fluids. The accuracy is high (compared with differential pressure type and float type flowmeter), generally the measured value (±1%～±2%), the pressure loss is small (about 1/4 to 1/2 of the orifice flowmeter). The output pulse signal proportional to the flow rate is suitable for total metering without zero drift; within a certain range of Reynolds number, the output frequency signal is not affected by the physical properties (density, viscosity) and composition of the fluid, that is, the meter coefficient is only related to the vortex The shape and size of the generator and the pipeline are related, and it only needs to be verified in a typical medium and is suitable for various media. 2. The limited VSF is not suitable for low Reynolds number measurements (ReD≥2×104), so the application is limited in the case of high viscosity, low flow rate and small caliber. The stability of the vortex separation is affected by the flow velocity distribution distortion and the swirling flow. According to the different forms of blocking elements on the upstream side, a long enough straight pipe section or a flow regulator (rectifier) ​​should be installed. Generally, the throttling differential pressure flow can be used for reference. The measured straight pipe length requires installation. Compared with the turbine flowmeter, the instrument coefficient is lower, the resolution is lower, and the larger the diameter, the lower the diameter. Generally, the full-tube flowmeter is used for DN300 or less. The instrument lacks theoretical research and practical experience in pulsating flow and mixed-phase flow. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'A Brief Discussion on the Advantages and Limitations of Vortex Flow Meters'
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Abstract: The information on the selection of instruments for water flow measurement is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Changzhou Chengfeng Flow Meter Co., Ltd., 30 years of brand, 30 years of professionalism, professional selection, professional quotation, summarizes the experience of production practice in the past 30 years, and strives to develop various flow measurement products. According to the needs of different customers, different clients. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the article on the selection of meters for water flow measurement. Shichengfeng flow meter, 30 years of brand, 30 years of professionalism, professional selection, professional quotation, summarizes the experience of production practice in the past 30 years, and strives to develop various flow measurement products, according to the needs of different customers, different customers According to the requirements of the equipment, we professionally customize all kinds of non-standard flowmeter products for customers in full accordance with the parameters and requirements provided by customers.“Tailored”,persist in“Quality*, User*”The factory management policy ensures long-term stability and continuous improvement of product quality, and provides users with high-quality products and perfect services. The measurement of water flow is not difficult. Most of the flowmeters with different principles can be used to measure the flow of water, but it is not guaranteed to be used well by just installing one. The following is a brief analysis of the advantages and disadvantages of the flow meters used to measure various water quality flows. 1. Measurement objects with high sediment content. The water flow measurement object with high sediment content is often found in raw water. If a throttle differential pressure flowmeter or an equal velocity pipe differential pressure flowmeter is used, the pressure taking valve and the blowdown valve are often blocked by sediment, which affects the use. In contrast, this is not the case with insertion vortex flowmeters and insertion electromagnetic flowmeters. Large-diameter water flow meters tend to have a low flow rate, and sediment in the water is easy to deposit on the inner wall of the measuring tube, which reduces the flow cross-sectional area, resulting in a high flow indication value, so it should be cleaned regularly. 2. Measurement objects for process monitoring and control. The water flow meters used for process monitoring and control generally do not require as high measurement accuracy as those used for trade settlement. The main considerations are reliability, price, and types of output signals. In the old devices of industrial and mining enterprises, the most used is still the throttle type differential pressure flowmeter. In new installations, people prefer to use vortex flowmeters because the installation of throttling differential pressure flowmeters is complicated, the maintenance workload is large, and the pressure loss is large. Installation and maintenance are very simple, so the throttling differential pressure flowmeter is likely to be squeezed out of the market in water flow measurement. However, the vortex flowmeter can only solve some water flow measurement problems, because the vortex flowmeter with a larger diameter is more expensive than the electromagnetic flowmeter of the same diameter, and the vortex flowmeter with the largest diameter can only achieve DN300~DN400. The smallest diameter vortex flowmeter is now DN15, and its minimum measurable water flow is 0.32/m3h, while the diameter of the electromagnetic flowmeter is from DN2.5 to DN3000, and the measurable flow is from 0.0053 to 305000m3/h, so the coverage range is Much wider than a vortex flowmeter. In terms of the minimum flow velocity that can be measured, the vortex street can only reach about 0.4m/s, while the electromagnetic flowmeter can measure normally at 0.1m/s. The price of large-diameter electromagnetic flowmeters is also very expensive. The saving plan is to use plug-in flowmeters. Among them, there are commonly used uniform velocity tubes, plug-in vortex flowmeters and plug-in electromagnetic flowmeters. The plug-in vortex flowmeter can measure The lower limit of the flow rate is 0.32m/s, while the lower limit of the flow rate that can be measured by the electromagnetic flow probe is unlimited, but the error is slightly larger, about (±0.2%R+1mm/s) 3. The measurement object in the state of gas-liquid equilibrium. For water in a state of gas-liquid equilibrium, such as the water at the outlet of a boiler deaerator tank, to measure its flow, the flowmeter should be installed after the booster pump. There is a certain pressure loss, and the water in the gas-liquid equilibrium state will cause part of the liquid to vaporize due to the pressure reduction, causing the flowmeter to show a high value. 4. Measurement of sewage flow. The characteristics of sewage are dirty, and some are also corrosive to a certain extent. The sewage transported by pipeline can be measured by electromagnetic flowmeter, and the sewage discharged through open channel is suitable for measurement by open channel flowmeter. 5. Flow measurement of deionized water. Deionized water and high-purity distilled water are water of extremely high purity, and their electrical conductivity is about 3 orders of magnitude smaller than the electrical conductivity that can be measured by general-purpose electromagnetic flowmeters, so they cannot be measured by electromagnetic flowmeters. The instrument intelligent electromagnetic flowmeter is developed based on the standardized manufacturing system. Its advanced design concept ensures the high precision and high reliability of the product. Compared with the old electromagnetic flowmeter, it has high measurement accuracy and strong reliability. It has the advantages of good stability, complete functions and long service life. Breaking the routine, meeting more customer requirements, and tailoring various types of non-standard flowmeters for customers is a kind of ability and an attitude. Let customers buy satisfactory products and let customers get perfect service. This is our attitude. Flowmeter, a good product you can trust. Chinese domestic brand flowmeter. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Instrument selection for water flow measurement'
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