Abstract: the electromagnetic flowmeter measurement scale in the steel industry cooling water false alarm information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Electromagnetic flowmeter in the steel industry cooling water measurement error alarm, this is what want to? Through long-term practical experience, we found that the electromagnetic flowmeter false alarms are mostly caused by the bubble brush electrode. How to solve this problem? To be in the first place. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the electromagnetic flowmeter measurement scale in the steel industry cooling water false-negatives article details. Electromagnetic flowmeter in the steel industry cooling water measurement error alarm, this is what want to? Through long-term practical experience, we found that the electromagnetic flowmeter false alarms are mostly caused by the bubble brush electrode. How to solve this problem? First of all to meet the requirements of meter length of straight pipe upstream from the installation, standard instrument installation, select the installation place away from direct heat, reasonable use of pipe flow rate, choosing high degree of finish of PFA fluorine plastic lining and high purity alumina ceramic tube. These measures will help to prevent or reduce the vortex and gas separation. That is to say, to improve manufacturing process, the improvement of sensor using the instrument environment and installation condition, adopt measures, such as instrument equipped with exhaust valve upstream could avoid the happening of the problem. Increase the damping time instrument can effectively solve the effect of the pulse type bubble noise, at the same time also brought the disadvantage of slow, namely when the real flow fluctuation, instrument response slowly. The sensitive control of cooling water system is a difficult problem. In order to solve this problem, the intelligent electromagnetic flowmeter can use software logic is bulky error processing method [ 5] 。 In appear this kind of failure, by adjusting the flow limit is not sensitive to time and changes in these two conditions is to determine changes in the flow, or bubble brush electrode. If not bubble grazed the noise of the electrode, the CPU according to the normal sampling, computing and digital filtering; If the judge is bubble noise, removal of the measured value, keep in front of the flow measurement value. So, during normal flow measurement damping time is 3 ~ 6 s. Only when a bubble noise, according to the length of the pulse width will not be sensitive time lengthen, system control of the time will be longer. Second, reasonably set the instrument damping time and function, can also solve a bubble noise measurement of false alarms. The timing of the damping is bubbling noise in according to the traffic signal pulse width is selected. General should take damping time for 3 ~ 5 times of the width of the bubble pulse noise. Such as bubble noise pulse width of 10 s, damping time should be take 30 ~ 50 s. Specific choice according to the requirements of control accuracy, three times the pulse width control error in 5%, five times the pulse width control accuracy is higher than 1%. When we choose reasonable electromagnetic flow converter with gross error suppression function & other; Rate limit & throughout; And & other Is not sensitive to the time value & throughout; , the converter can not only inhibit bubbles of false alarm caused by noise, and response speed in normal work instrument can still keep the time set by the damping value. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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Abstract: the vortex and the comparison of orifice meter scale information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. 1, LUGB vortex street flowmeter and the orifice meter is the technical level of vortex flow master the basic structure of the vortex happens body, detecting element, signal processing of amplifying circuit, current research body for causing vortex street has reached a fairly perfect degree, in the triangle. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a vortex and the comparison of orifice meter scale article details. 1, LUGB vortex street flowmeter and the orifice meter is the technical level of vortex flow master the basic structure of the vortex happens body, detecting element, signal processing of amplifying circuit, current research body for causing vortex street has reached a fairly perfect degree, in triangular body of zui type body, detecting element has a thermistor, strain gauge, piezoelectric crystal, differential capacitance, ultrasonic, etc. There are many signal processing part is realized. Vortex street flowmeter has convenient installation, Can be directly installed on the pipeline) , small volume, strong interchangeability, high precision and can be applied to measure most liquids, gases and vapors. The present of vortex flowmeter in the world market sales increasing by about 30% a year. At present, the orifice meter technology development level still to determine the basis of the empirical formula, the international organization for standardization, 1980 with R541 R781 two merged into standard ISO5167 ( 1980). 。 Orifice throttling device because of its simple structure, low cost and reliable, it is suitable for almost all media measurement, and the differential pressure transmitter associated development is rapid, its itself is insufficient to make up for. 2, vortex street flowmeter and the orifice meter comprehensive performance evaluation of orifice meter ( Orifice plate) Through throttling a pressure device and differential pressure transmitter, pressure guide tube for easy cold place requires heating measures, a flow measurement circuit of the static sealing point is about 20, the use of the following problems: easy to cold, easy to block, easy to leak, heating cause differential pressure transmitter components ageing, some occasions add spacer guide pressure tube and unstable due to heating or process operation, positive and negative guide spacer fluid pressure pipe line, often produce liquid column is poor, the flow indicator is not allowed. Above change will make the flow coefficient, measurement accuracy is reduced, pipe shortened lead pressure differential pressure transmitter directly installed on the pipeline, but there are still a flow dead zone. Vortex street flowmeter ( Vortex street) Only three static sealing point, not easy to leak, no dead zone, without thermal insulation, are not affected by severe fluid, temperature, pressure, and viscosity, flow coefficient unchanged for a long time. But there are vortex in vibration occasions, when using can make the flow measurement is not allowed. At present, the market has launched anti vibration type vortex street, to overcome the effects of vibration is not allowed for flow measurement. （ 1) Initial investment in a imported vortex street is about 20000 yuan ( DN15 - DN50) And a throttling device including differential pressure transmitter, orifice plate and flange, pressure pipe, valves, heat preservation box or protection box also need to 1. 50000 yuan, from a long-term point of view, using vortex street is still worthwhile. ( 2) Installation cost vortex street is simple, just before and after the meter has certain straight pipe, line segment, concentricity, orifice tube, and transmitter incubator has certain vortex street is the cost of installation requirements, several times. （ 3) Maintenance vortex street except on the metering requires periodic calibration, generally do not fail, while the orifice otherwise, leakage, regular drainage, irrigation, spacer, replace the pressure pipe, valves, heat preservation, clean the orifice plate, etc. , have a certain amount of maintenance. Such as 200 sets of flow orifice measurement circuit ( Need to heat preservation heat tracing) , every two years, the heat preservation heat tracing system reform will have to put some repairs, this does not include the differential pressure transmitter updates, orifice renewal fees. It enough to buy a certain quantity of imported vortex street. （ 4) 1 running cost. Steam consumption costs such as 200 sets of flow orifice measurement circuit ( Need to heat preservation heat tracing) , each with hot steam consumption is 0. 02 t/h, if calculated by an average of 4300 hours a year, steam cost is 40 yuan/ton, it needs steam consumption cost is about 68 a year. 80000 yuan, each loop annual cost is zero. 3. 44 million yuan. 2. Energy costs of vortex street pressure loss is smaller than orifice, about 1/15 of the orifice plate. Therefore, long-term operation of pump and fan can cost less. Orifice plate is 15 times of vortex street, when used for gas or steam flow measurement, due to the density is small, the same pipe diameter volume flow is big, the pressure loss is more serious, energy consumption cost is higher. 3. Leakage discharge sewage charge depending on the number that is about 20 times a year or so commonly, discharge of sewage and material atmospheric environmental pollution, sewage, the environmental protection department also want to its fine. （ 5) The design of the long running accuracy of orifice system accuracy of 1. 5% - 2. 5%, due to the differential pressure and flow rate is a linear relationship, the Philippines when the flow rate is less than 30%, the error increases, gas is too serious, on the other hand, due to the use of medium long-term wear, acute dull, make the flow coefficient is changed, is also an important factor affecting the accuracy. Due to the special structure of the vortex street, after the accuracy determined by way of actual ( Is about 0. 5% - 1% measured value) , the accuracy is almost the same.
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Abstract: The use points and installation requirements of vortex flowmeters are provided by excellent flowmeter and flowmeter manufacturers. Vortex flowmeter: 1. In terms of model selection, some vortex flowmeters have a larger diameter due to the selection of caliber or due to changes in process conditions after design and selection. Improve measurement accuracy, thereby. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the main points of use and installation requirements of vortex flowmeters. Vortex flowmeter: 1. In terms of model selection, some vortex flowmeters have a larger diameter due to the selection of caliber or due to changes in process conditions after design and selection. To improve the measurement accuracy, the resulting problems are: (1): the indication is inaccurate for a long time; (2): the indication fluctuates in a large range and cannot be read; (3): the indication is ok when the flow is large, but the indication is inaccurate when the flow is small. For example, a vortex pipeline is designed to be used by several equipments. Since some of the equipment in the process are sometimes not used, the current actual flow rate is reduced. The actual use causes the original design selection diameter to be too large, which is equivalent to increasing the measurable flow rate. The lower limit, the indication cannot be guaranteed when the flow rate of the process pipeline is small, and the vortex flowmeter can be used when the flow rate is large, because it is very difficult to rebuild. Changes in process conditions are only temporary. Can be combined with parameter re-tuning to improve indication accuracy. Two: Installation (1): The length of the straight pipe section in front of the vortex flowmeter is not enough, which affects the measurement accuracy, and the indication is inaccurate for a long time. For example: the straight pipe section in front of the sensor is obviously insufficient. Since the FIC203 is not used for measurement, it is only used for control. All current precision use is equivalent to degraded use. Three: Parameter setting direction (1): Due to wrong parameters, the vortex flowmeter indicates wrong. The parameter error makes the calculation of the full-scale frequency of the secondary instrument wrong, the indication is inaccurate for a long time, there is always no indication, the K coefficient of the instrument cannot be determined, and the data are inconsistent in many places. (2): The similar full-scale frequency makes the indication inaccurate for a long time, and the actual full-scale frequency is larger than the calculated full-scale frequency, which makes the indication fluctuate in a large range and cannot be read, and the inconsistency of the parameters in the data affects the final parameter. Determined, such a problem needs to be re-calibrated, combined with mutual comparison to determine the parameters, in order to solve this problem. Four: Secondary instrument fault (1): The indication is inaccurate for a long time, there is no indication all the time, etc. There are many faults in this part, including: the circuit board of the primary vortex flowmeter has a disconnection, the range setting has a bad display of individual bits, The K coefficient setting has individual digit display bad, making it impossible to determine the range setting and K coefficient setting, etc. By fixing the corresponding failure, the problem is solved. Five: Four-way circuit connection (1): Some circuits appear to be well connected on the surface. Check carefully. Some connectors have actually been loose, causing the circuit to be interrupted. Although some connectors are tightly connected, the tightening screws are tight due to the problem of the secondary line. It is fixed on the wire skin, which also causes the circuit to be interrupted. This part of the reason for the vortex flowmeter is mainly related to the lack of indication. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Key points of use and installation requirements of vortex flowmeter'
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Abstract: The quality of the gas flow meter is judged from multiple angles and multiple aspects. The information is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. The quality of the gas flow meter can be partly judged by the manufacturer, but the other part is the accuracy of the final result. Simply put, the ancients said that a good cat is a good cat if it can catch mice regardless of whether it is black or white. So the final result is fine. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the determination of the quality of gas flowmeters. The quality of the gas flow meter can be judged by the manufacturer, but the other part is the accuracy of the final result. Simply put, the ancients said that no matter what“A black cat and a white cat are good cats if they can catch mice”, so the accuracy of the final result is a large proportion of the standard for judging the quality of the instrument, but what I want to say here today is that both from the manufacturer and from the quality are excellent, but the result is not accurate, this time Think carefully about whether it was affected during the test! Error 1: Unreasonable pipeline design It is well known that gas flowmeter is a commonly used gas measuring instrument, mainly for measuring gas, air, nitrogen, acetylene, phosgene, hydrogen, natural gas, nitrogen, liquefied petroleum gas, etc. A common cause of inaccurate results is that unreasonable pipeline design may cause large measurement errors. Two parallel pipelines, when the main network uses gas, the manual valve of the branch network is closed. The gas flow meter measures normally. When the sub-pipeline is also using gas, the manual valve is opened. Since the gas in the main pipeline is divided into part by the sub-pipeline, the air pressure in the main pipeline will drop, so that the pressure before the flow meter is lower than the pressure behind the meter. The flowmeter is reversed, and the flowmeter also accumulates flow, resulting in double metering. To avoid this, a check valve must be installed in front of flow meter 1. Diversified gas flowmeter picture error 2: high pressure and low pressure are not divided. There is a second effect that the measurer will use high pressure to measure low pressure gas. It is to install the metering chamber on the high-pressure pipeline, and then adjust the pressure through the pressure regulator. The gas user uses gas on the low-pressure pipeline. When the gas consumption of the low-pressure pipeline user is not large, according to the gas state equation, the temperature is similar. When the small flow of the low-pressure pipeline is inversely calculated to the high-pressure pipeline, the flow will be smaller, and even this flow cannot reach the starting flow of the flowmeter. The flow meter does not count. Therefore, it will cause a large measurement error. Error 3: Improper installation The correct installation of the gas flowmeter will help improve the measurement accuracy of the flowmeter and prolong its service life. When the flowmeter is installed on the pipeline, it should be ensured that the threaded holes on the flowmeter body and the threaded holes of the pipeline flange are aligned to ensure the parallelism of the flange, avoid the flowmeter from being subjected to other external forces, and prevent the meter body from being deformed by force, so that the Flowmeter stuck. When opening the flowmeter, the front valve should be opened first, and then the rear valve should be opened slowly, so that the gas flowmeter can be started under pressure, so as to avoid the flowmeter being stuck due to the impact deformation of the flowmeter rotor due to the gas hammer effect. The above are the influences of external factors during measurement, and of course their own influences. For example, when the gas flowmeter is made, due to rough parts, assembly accuracy and wear and other reasons, the accuracy of the flowmeter itself is not high or the accuracy is reduced, which makes the measurement The number of products is inaccurate. Therefore, when selecting a flowmeter, one with higher accuracy should be selected. At present, the accuracy of the working flowmeter required in my country is±0.5%, and periodic verification should be carried out according to the regulations in use. This depends on the responsible attitude of the manufacturer, as well as the keen eye of the buyer! The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Determination of the quality of gas flow meter, multi-angle and multi-aspect'
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Mechanical Flow Meter Working Principle: A Comprehensive Guide to Understanding Its Functionality and Applications

Introduction

Flow meters play a crucial role in various industries, providing accurate measurements of fluid or gas movement. One such type is the mechanical flow meter, which operates based on the principles of mechanics and fluid dynamics. This article aims to delve into the working principle of mechanical flow meters, exploring their design, components, and applications in different fields. By understanding the intricate details of mechanical flow meters, engineers and technicians can make informed decisions in selecting, installing, and maintaining these devices.

I. The Basics of Mechanical Flow Meters

A. Definition and Purpose

Mechanical flow meters are devices used to measure the flow rate, total volume, or velocity of a fluid or gas. These meters are referred to as mechanical because they utilize mechanical components, such as gears, turbines, or pistons, to determine the flow. By converting the flow into physical motion, mechanical flow meters provide readings that can be easily measured and recorded.

B. Components of a Mechanical Flow Meter

1. Housing and Enclosure

The outer shell, known as the housing or enclosure, provides protection to the internal components of the flow meter. It is typically made of durable materials like stainless steel or aluminum to withstand harsh environments.

2. Primary Measuring Element

The primary measuring element varies depending on the type of mechanical flow meter. It could be a paddlewheel, a piston, or a rotating gear. This component directly interacts with the fluid or gas flow, causing measurable motion that indicates the flow rate.

II. Types of Mechanical Flow Meters

A. Turbine Flow Meters

Turbine flow meters use a turbine rotor to measure fluid velocity. As the fluid flows through the meter, it impinges on the turbine blades, causing rotation. The rotational speed of the turbine is directly proportional to the fluid velocity, allowing for accurate flow rate calculations. Turbine flow meters are widely used in industries such as oil and gas, chemical, and wastewater treatment.

B. Positive Displacement Flow Meters

Positive displacement flow meters operate by dividing the fluid flow into discrete volumetric portions using rotating or reciprocating mechanisms. These include gear meters, oscillating piston meters, and nutating disk meters. Positive displacement meters are highly accurate, particularly for low flow rates, making them suitable for applications like custody transfer measurement and batching.

C. Variable Area Flow Meters

Also known as rotameters, variable area flow meters rely on a tapered tube where a float moves proportionally to the fluid flow rate. As the fluid flow increases, the float rises, creating an annular opening through which the fluid passes. This type of flow meter provides a visual indication of the flow rate and is often used in laboratories and low-flow applications.

III. Working Principle of a Mechanical Flow Meter

A. Turbine Flow Meter Working Principle

In a turbine flow meter, the fluid enters the meter housing and encounters a multi-bladed rotor. The rotor, coupled with a magnetic pickup, begins to rotate as the fluid flows over it. The rotational speed of the rotor is directly proportional to the fluid velocity, and a magnetic pickup generates electrical pulses with a frequency corresponding to the rotor speed. By counting these pulses, the flow rate can be determined.

B. Positive Displacement Flow Meter Working Principle

Positive displacement flow meters work by dividing the flow into known volumes using rotating or reciprocating mechanisms. Each rotation or reciprocation displaces a fixed volume of fluid, which can then be measured. By counting the number of completed cycles within a given time, the flow rate can be derived accurately.

C. Variable Area Flow Meter Working Principle

Variable area flow meters work on the principle of balancing the forces exerted on a float inside a tapered tube. As the fluid enters the meter, it pushes the float upward until the gravitational force matches the fluid's upward force. The float's position corresponds to the fluid flow rate, and a calibrated scale on the tube provides a direct reading.

IV. Applications of Mechanical Flow Meters

A. Oil and Gas Industry

The oil and gas industry extensively employs mechanical flow meters for monitoring the flow rate of oil, gas, and other fluids during extraction, refining, and distribution processes. Turbine flow meters are commonly used due to their durability, accuracy, and ability to handle corrosive fluids.

B. Chemical Industry

In chemical plants, mechanical flow meters enable accurate measurement of various chemicals' flow rates, ensuring precise dosing and mixing. Positive displacement meters are often favored in this industry due to their high level of accuracy and repeatability.

C. Water Treatment and Distribution

Mechanical flow meters are essential in the water treatment and distribution sector to measure and monitor water consumption accurately. From water treatment plants to residential water meters, various types of flow meters are used to keep track of flow rates, ensuring efficient water supply management.

D. HVAC Systems

Heating, ventilation, and air conditioning (HVAC) systems rely on mechanical flow meters to regulate the flow of air, water, or refrigerants within a building. These flow meters assist in maintaining optimum heating and cooling conditions, leading to energy-efficient operations.

E. Pharmaceutical and Food Industries

Mechanical flow meters play a critical role in pharmaceutical and food processing, enabling precise measurements of liquid ingredients, such as medications, syrups, and food additives. The accurate dispensing and mixing of these substances are essential to ensure product quality and safety.

Conclusion

Mechanical flow meters serve as vital tools in various industries, offering accurate measurements of fluid or gas flow rates, volumes, and velocities. Understanding the working principle and different types of mechanical flow meters is crucial to select the right meter for specific applications. Whether it be turbine flow meters for the oil and gas industry or positive displacement meters for custody transfer, the versatility and reliability of mechanical flow meters make them indispensable in industrial processes.

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