Abstract: the definition of flow meter and the definition of parameters, flow meter and parameter, environmental protection technology information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Flow meter can be used for gas heating, water heating, hot air heating system and heat exchange system, the heat transfer, mass transfer to realize online measurement, thus for enterprise energy management, energy metering, technical and economic index calculation. Beijing day kang ( Group) Shares. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the definition of flow meter and parameters, the definition of flow meter, and, environmental protection technical articles for details. Flow meter can be used for gas heating, water heating, hot air heating system and heat exchange system, the heat transfer, mass transfer to realize online measurement, thus for enterprise energy management, energy metering, technical and economic index calculation. Beijing day kang ( Group) Shares of product broke through to the quality of the heat transfer medium single measurement model. For example: for steam metering, adopt t/h or t measuring only show the actual mass flow rate and the cumulative amount of steam; And steam is primarily as an energy transfer media, the application of people is its pressure energy and heat energy, for expanding power and heating. Steam in different state parameters ( Pressure, temperature) Under the specific enthalpy and enthalpy value is different, the expanding power ability and heat are different. And HR - XLQ heat according to integrating large capacity chip controller was adopted, the state parameters of steam, hot water, Pressure, temperature) And steam, hot water of specific volume, enthalpy control function table is stored in the E2PROM chips was introduced, through online measuring the state of the online measuring parameters, pressure, temperature and mass flow rate through calculation software to realize online measurement of specific enthalpy and enthalpy. Steam enthalpy change in the expanding power or heat exchange, by calculating the heat change the software computing system or heat exchange capacity. Only in the input port input pressure, temperature, flow rate signal, namely become heat enthalpy display integrating control device, can measure the specific enthalpy and enthalpy heat transfer medium. Can output standard analog signal, such as: 4 ~ 20 ma, 0 ~ 10 ma, 1 ~ 5 v, 0 ~ 5 v supply control system, the signal can be output is serial communication, with serial input/output devices and communications, composition control management system. 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 reasons for the errors in the measurement of tap water flow meters and the processing methods are provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. There are problems The electromagnetic flowmeter is used to measure the flow of tap water, which is accurate most of the time of the year, but in the high temperature period, the sub-meter runs faster than the total meter. A set of tap water flow meters are installed on the fifth and third floors of the podium of a building in Shanghai, and there is no meter on the fourth floor, so the difference method is used for calculation. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the reasons for the errors in the measurement of tap water flowmeters and the details of the treatment methods. There are problems The electromagnetic flowmeter is used to measure the flow of tap water, which is accurate most of the time of the year, but in the high temperature period, the sub-meter runs faster than the total meter. A set of tap water flow meters are installed on the fifth and third floors of the podium of a building in Shanghai, and there are no meters on the fourth floor. The difference method is used to calculate the water consumption: Q4= Q5-Q3 in the formula Q4—Total water consumption by users on the fourth floor, m3; Q5—The total amount of total surface water on the fifth floor, m3; Q3—The total water consumption of users on the third floor, m3. The system diagram is shown in the figure. Calculated from the statistical data of the computer metering data collection system, the statistical results of the total water consumption in the past few years were normal, but in the hottest days in Shanghai in the summer of 2010, the Q4 had a negative value. The reason was that the Q3>Q5, this conclusion is wrong. Analysis and Diagnosis (1) Why is the electromagnetic flowmeter on the third floor high? Relevant personnel inspected the site and found that the water tank located on the fifth floor had no direct sunlight. Since the water tank is an open container, the dissolved air in the water should be saturated. The water pipes absorb heat from the atmosphere along the way, and the water temperature rises, especially on the third floor. There is a section of about 20m long laid outdoors, and the temperature rises even higher. The tap water flows through here and enters the flow meter on the third floor. The gas comes out of the water and collects in the upper part of the horizontal pipe. When this section of the pipeline reaches the third floor, there is no chance for it to go up, so the gas accumulated in the horizontal pipe cannot be discharged. There is inevitably gas in the measuring pipe of the tap water flowmeter installed on the horizontal pipe on the third floor, occupying a certain flow cross-sectional area, so that the flow indication value is on the high side. (2) Suggestions for rectification Add a gas collector and an exhaust valve at the appropriate position of the horizontal pipe on the third floor to regularly discharge the accumulated gas in the pipe. There will be no accumulation of gas in the pipe in autumn, winter and spring, and generally no exhaust is required. (1) Reasons for the negative value of Q4 There are two reasons for the negative value of Q4. One is that the air is accumulated in the horizontal pipe on the third floor, and it cannot be discharged by itself, and there is no exhaust port, so the indication value of the tap water flowmeter on the third floor is too high. ; Second, in formula (4.22), Q4 is a very small value, that is, the fourth floor is a very small user, and the monthly statistics report shows that its water consumption is less than 2% of that of users on the third floor, so the error between Q5 and Q3 In the end, it will be digested by Q4, which will bring large errors to the measurement data of the fourth floor. If the meter is refitted on the fourth floor and the water consumption on the third floor is obtained by subtraction, there will be no negative value for users. This lesson can be drawn“measure small”“reckoned large”is a useful experience. (2) Install an exhaust valve where necessary It is also an important experience to install an exhaust valve where gas may accumulate and cannot be discharged by itself. (3) Another type of non-full pipe flow measurement object A For flow measurement objects such as municipal drainage and wastewater treatment, although the pipe is not full, it is completely different from the above situation, and the treatment method is also completely different. For measurement objects that are often partially filled and cannot be made full, a partially full flow meter should be used. The following is a type of non-full pipe flowmeter. The working principle of the electromagnetic flow meter that is not full pipe The pipeline type tap water flow meter is usually applied to the liquid full pipe flow of the closed pipe. For the situation where the flow rate varies greatly, sometimes the pipeline is full, and sometimes the pipeline is not full, the pipeline type tap water flowmeter is not suitable. At this time, a non-full pipe water flow meter is required. Non-full pipe electromagnetic flow sensor can be consistent with the installed pipe diameter, work in a wide range, and can be used for full pipe flow in closed pipes and non-closed pipes or free surface flow measurement of open pipes, and does not produce head loss, such as municipal Drainage, wastewater treatment, agricultural irrigation, fluids are measured by the flow of natural flow. The tap water flowmeter is based on the constant cross-sectional area of ​​the sensor, and the average flow rate is measured to obtain the flow rate. The cross-sectional area of ​​the fluid in the non-full pipe varies, and the flow measurement should not only measure the average flow rate flowing through the sensor, but also measure the cross-sectional area of ​​the fluid flowing through the sensor. That is to say, the flow measurement of the non-full pipe water flow meter At least two variables, flow rate and level, are required. Figure 4.24 shows the structural principle of a non-full pipe flow sensor model TIDALFLUX4000. It is an electromagnetic flow sensor with an integrated capacitive liquid level measurement system and is designed for conductive liquids. The flow q(t) flowing through the pipeline is: q(t)=v(t)A(t) where v(t)—Flow rate; A(t)—Fluid cross-sectional area. The flow rate is determined based on the known principles of electromagnetic flow measurement. In order to measure 10% of the liquid level reliably, two measuring electrodes are arranged in the lower part of the measuring tube about 10% of the height. There is a pair of excitation coils above and below the measuring tube, which generates a magnetic field when an excitation current flows through the coils.
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Abstract: The reasons for the decline in the accuracy of the flow meter and the solution information are provided by the excellent flow meter and flow meter production and quotation manufacturers. At present, there are many types of flowmeters, but generally used are positive displacement flowmeters, electromagnetic flowmeters, turbine flowmeters, and vortex flowmeters. The accuracy of the flowmeter is generally determined under the reference conditions at the factory. affect the reference conditions. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the reasons for the decline in the accuracy of flowmeters and solutions. At present, there are many types of flowmeters, but generally used are positive displacement flowmeters, electromagnetic flowmeters, turbine flowmeters, and vortex flowmeters. The accuracy of the flowmeter is generally determined under the reference conditions at the factory. There are many factors that affect the reference condition, such as environmental conditions, power source conditions of electromagnetic flowmeters, and fluid conditions. However, the actual operating conditions of a flow meter are usually different from the reference conditions, so there will be a drop in accuracy during use. Also, the degree to which the accuracy of different meters changes is different. The following is an analysis of the reasons for the decline of the accuracy of different flowmeters and the solutions: 1. The accuracy of the throttling device throttling device generally does not require fluid calibration, and the factory inspection is mostly used.“dry label”method, the basic accuracy can be calculated. The calculation is based on the supply provided by the buyer“Rated value”, The density of the medium can be automatically compensated and displayed intelligently. In this case, the key point is whether the installation location of the instrument meets the requirements of the instrument, such as the length of the straight pipe section. If the requirements are not met, the calculation of the additional error should refer to Instruction manual for the instrument. If the density of the medium is calculated manually, when the actual state of the fluid medium is different from the design state, for general gases, the displayed value of flow should be multiplied by a correction factor, and T, Z, and P are respectively designed under the rated working state. medium temperature, compression coefficient, and medium pressure; t, z, and p are the medium temperature, compression coefficient, and medium pressure under actual working conditions, respectively. Obviously, the temperature and pressure of the fluid change randomly during actual work, and the manual compensation of the ultrasonic flowmeter can only compensate the average value, and the error is significant. The better way is to use an intelligent instrument to automatically compensate. For ideal (or near-ideal) gases, this compensation accuracy is quite high, and the accuracy of displayed mass flow or standard volume flow can reach± 1%. The throttling device has certain requirements for the straight pipe section, and the additional error caused when it cannot be satisfied is specified for the standard throttling device. 2. The additional error caused by the positive displacement flowmeter under the actual working conditions of the positive displacement flowmeter is usually due to the influence of the temperature and pressure of the fluid medium on the volume of the metering cavity. When the material of the cavity is known, it can be calculated The change in volume corrects the reading of the display meter. The viscosity of the actual fluid may also have an effect on the meter reading and should be considered according to the meter's instructions. The length of the straight pipe generally does not affect its accuracy, which is the outstanding advantage of this type of instrument. This type of instrument displays the volume flow of the fluid in the working state, and the user usually needs the volume flow or mass flow under the standard state, and also needs to perform the density compensation of the fluid. Most of the new flowmeters now use intelligent display instruments and perform automatic density compensation. 3. The principle of electromagnetic flowmeter The electromagnetic flowmeter is based on Faraday's electromagnetic induction theorem. The inner diameter (flow area) of the sensor's pipeline has an influence on the measured value. When the pressure and temperature of the fluid medium are different from the reference conditions, the difference in the flow area causes the meter Changes in readings can be calculated, otherwise a certain error will occur. The instrument has lower requirements for straight pipe sections. Users of pressure transmitters should pay attention to the fact that there is currently no correction formula when the straight pipe section is insufficient. The meter measures the volume flow in the working state. If the volume flow or mass flow in the standard state is required, density compensation is required. 4. Turbine flowmeter is sensitive to on-site conditions, and it is best for users to fully meet its requirements in order to maintain the accuracy of the factory. When the temperature and pressure of the fluid medium are quite different from the reference conditions, the volume change of the sensor housing can be calculated according to the material and temperature and pressure of the sensor, and the meter reading can be corrected. When the viscosity of the fluid medium in the working state is quite different from the viscosity of the calibration fluid, it should be corrected according to the viscosity correction curve provided by the instrument manufacturer. Turbine flowmeters have certain requirements on the length of their upstream and downstream straight pipe sections, which should be met, especially when users require high precision. The meter displays the volume flow under the working conditions of the medium. To know the standard volume flow or mass flow, density compensation is also required.
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Liquid flow measurement in large-diameter pipelines Features of liquid flow measurement in large-diameter pipelines ①The larger the diameter of the pipeline, the smaller the pressure loss, the better. It is generally not allowed to increase the flow rate by local diameter reduction. ②The flow rate is generally not high. For newly designed and installed pipelines, economic flow rates are generally selected. Because the flow rate is too low, it is bound to increase the investment in pipelines, and the flow rate is too high, which will cause a substantial increase in power loss and lead to an increase in operating costs, which is uneconomical. For some old pipelines, the flow rate has been increased due to the need to increase production. ③Due to the low flow rate, dirt and silt in the fluid are easily deposited on the inner wall of the pipeline. When designing the operating system, the cleaning of the parts in contact with the instrument and the fluid should be considered. ④ The measurement range is required to be large. The flow rate of some water pipes varies greatly between nighttime and daytime, winter and summer, as many as 10〜20 times, some air conditioners simply stop using water in a certain season. Therefore, the flow meters for these waters require a particularly large range. ⑤ High protection level requirements. Most of the large-diameter pipelines are laid underground in order to save space. In the north, it is also necessary for anti-freezing. Therefore, the flow sensor is mostly installed on the pipe section in the instrument well. Rainwater, well wall leakage and pipeline leakage often cause the water level in the well to rise and flood the flow sensor, so this situation should be considered during design.
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Understanding the Importance and Functionality of Mass Flow Sensors

Mass flow sensors play a critical role in various industries and applications, providing accurate measurements of fluid flow rates. From automotive and aerospace to pharmaceutical and manufacturing sectors, these sensors are utilized in a wide range of systems to ensure efficiency, reliability, and safety. In this article, we delve into the significance of mass flow sensors, exploring their functionality, applications, and costs.

The Working Principle of Mass Flow Sensors

Mass flow sensors, often referred to as mass flow meters, measure the amount of mass (or weight) passing through a specific point per unit time. These sensors operate based on several principles, including thermal, coriolis, and pressure differential. However, the most widely used type is the thermal mass flow sensor. This type measures flow by sensing the temperature difference between a heated element and the passing fluid, allowing for highly accurate readings.

Where Are Mass Flow Sensors Used?

Industries such as automotive, aerospace, HVAC, medical equipment, and food processing heavily rely on mass flow sensors. In automotive applications, mass flow sensors measure the amount of air entering the engine, helping optimize fuel injection and enhance overall performance. In pharmaceutical and biotechnology industries, these sensors are crucial for precise control of gas delivery during the fermentation process. Mass flow sensors also find use in gas chromatography, where accurate measurements are essential for analytical purposes.

Factors Affecting Mass Flow Sensor Performance

Several factors influence the performance and accuracy of mass flow sensors. Some key considerations include the type of fluid being measured, temperature, pressure, and flow range. Different models of mass flow sensors are available, designed to meet specific requirements. For example, certain sensors are specifically designed to handle corrosive gases or fluids at high temperatures. It is crucial to select an appropriate sensor that not only measures accurately but can withstand the operating conditions of the application.

Cost Considerations for Mass Flow Sensors

The cost of a mass flow sensor can vary depending on multiple factors, including the type, specifications, and manufacturer. Basic thermal mass flow sensors can range from $100 to $500, which makes them relatively affordable for most applications. However, specialized sensors with advanced features or those designed for extreme conditions can have higher price points, reaching several thousand dollars. It is important to consider the overall value and functionality of the sensor rather than focusing solely on the initial cost.

Choosing the Right Mass Flow Sensor

When selecting a mass flow sensor, it is crucial to evaluate various aspects to ensure optimal performance and compatibility with the intended application. Important factors to consider include the desired flow range, accuracy requirements, temperature and pressure limits, response time, and the fluid or gas being measured. Additionally, assessing the reputation and reliability of the manufacturer, as well as their support and warranty options, is vital in making an informed decision.

Maintaining and Calibrating Mass Flow Sensors

To ensure accurate and reliable measurements over the long term, regular maintenance and calibration of mass flow sensors are necessary. Calibration should be performed in accordance with the manufacturer's guidelines or using certified calibration equipment. Many manufacturers offer calibration services or provide detailed instructions for on-site calibration. Routine maintenance may include cleaning the sensor, checking for any physical damage, and inspecting the electrical connections.

In conclusion, mass flow sensors are essential devices used in a wide range of industries and applications, providing accurate measurements of fluid or gas flow rates. Understanding the working principle, application-specific considerations, and cost factors is essential when selecting the right sensor for a particular system. By carefully assessing these factors and ensuring proper maintenance, businesses can leverage the benefits of mass flow sensors to achieve enhanced efficiency, accuracy, and performance in their operations.

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