The thermal flow meter is a meter that detects the flow rate using the heat transfer principle, that is, the flow rate is detected according to the heat exchange between the fluid in the fluid and the heat source (fluid inner or external heated object or heated). mainly measuring the gas; the thermal mass flow meter is mainly divided into two types, namely heat distribution and immersion (or insert).

 

1. Features of the thermal mass flow meter

 

(1) Main features of thermal distributed mass flow meter: Direct measurement of mass flow without temperature and pressure compensation; non-contact, no movable parts, no blocking, low pressure loss, high reliability; measurement of low flow micro gas Traffic, minimum 5ml / min (standard state); required gas medium dry cleaning, no water, oil, etc.; shunting can obtain linear characteristics, can be used to measure large, medium voltage flow, ensuring shunt temperature; dynamic response is very slow, The time constant is approximately 5 s.

 

(2) Main characteristics of immersion thermal mass flow meter: Direct measurement of mass flow without temperature and pressure compensation; no movable components, high reliability; suitable for large diameter, non-circular cross-section, narrow space measurement (insert After testing, the platinum resistance sensor uses a stainless steel housing, and it is not sensitive to dust, solid particles, oil and moisture of other parts. The plugin type can be removed continuously for repair and replacement. Can be used to measure the measuring of the dirt.

 

2. Use the thermal mass flowmeter

 

(1) For small and micro motion coriolis streams, the thermal distributed mass flow meter can be used for single-component gas or fixed proportional mixed gas measurements.

 

(2) The insertion immersion thermal mass flow meter can be selected for large caliber flow measurement.

 

3. Precautions for the installation and use of the thermal mass flow meter

 

(1) In the installation posture, most of the thermal distributed mass flow meters can be mounted at any position (horizontal, vertical or tilt), as long as the electrical zero adjustment is adjusted at the pressure and temperature after installation, some instruments are installed. Sensitive, must be carried out in strict accordance with the instructions. Most immersed thermal mass flow meters are not affected by the installation posture, but should be operated in strict accordance with the low flow rate.

 

(2) In the case of a front straight pipe section, the heat distribution is not sensitive, the immersion flow sensor and the insert meter with measured tube require a certain length of straight pipe section, and according to the manufacturer's recommendations.

 

(3) The vibration of the pipe connected to the thermal mass flow meter does not cause vibration interference within a common range; the detection lever of the inserted thermal mass flowmeter must be fixed to the pipe and avoid vibration.

 

(4) The thermal flow meter gauge response time is long, and the pulsation flow is not suitable.

Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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insertion ultrasonic flow meter problems are nothing new, almost every one of us have to go through them at some point of our lives and some of us never get rid of them. with the development of electromagnetic flow meter slurry technology, now provides a perfect cure for that.

Abstract: the electromagnetic flow meter scale application in papermaking pulp industry information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. With the acceleration of China's industrialization, environmental pollution is increasingly serious, society of sustainable development is becoming more and more high, the concept of harmonious coexistence between man and nature to accept by people, to all sorts of pollution of more urgent. The application and effect. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the application of electromagnetic flow meter scale in papermaking pulp industry article details. With the acceleration of China's industrialization, environmental pollution is increasingly serious, society of sustainable development is becoming more and more high, the concept of harmonious coexistence between man and nature to accept by people, to all sorts of pollution of more urgent. Application and effect of wastewater treatment process is mainly through the biological oxidation, flocculation, sedimentation process to achieve the purpose of sewage purification, such as in each stage needs certain flow meter to measure. In the wastewater treatment process, must according to the technological requirements, configure corresponding detection instrument, constitute a reliable control system. A water treatment plant is equipped with a flow meter in the following process detection process: 1 inlet pipe; At the beginning of 2 pond to mud quantity detection for mud pools; 3 sludge pump room, remaining sludge flow detection; 4 sludge pump reflux sludge flow detection; 5 the second pond with water out of the water flow detection; 6 digester into mud quantity detection; The quantity of mud digester detection; 8 flocculation pool medicament into quantity detection and so on. Because in the wastewater treatment process, need to discharge measure and control, additives, such as sludge, so the flow measurement is very important. 1. Electromagnetic flowmeter features of electromagnetic flowmeter is not affected by the influence of external factors such as temperature, pressure, viscosity, measurements of the interior of the tube without shrinkage or bulge caused by the pressure loss, in addition, the flow element to detect the signal at the beginning of zui is an average flow velocity and fluid into precise linear change voltage, it has nothing to do with the other properties of the fluid, has great superiority. According to the change of sewage flow, containing impurities, corrosive small, have certain features such as conductive ability, measure sewage flow, the electromagnetic flowmeter is a good choice. Its compact structure, small volume. Installation, operation and maintenance convenience, measurement system using intelligent design, the overall sealing, can work normally under the harsh environment. And vortex street flowmeter due to technical reasons, the diameter is difficult to do big, quality, pipeline lacks competitive advantage in price relative to the electromagnetic ultrasonic flowmeter. So in water and wastewater industry, electromagnetic flowmeter, especially large diameter electromagnetic flowmeter has great advantages, has been very widely used. TKLD series electromagnetic flowmeter powerful, simple operation, the characteristics of the specific as follows: 1 measuring pipe unimpeded flow components, without the loss of pressure, bottom straight pipe requirements. 2 lining has a hard rubber, polyurethane, PTFE, PFA and other materials to choose from. 3 transmitter of dc power supply/ac power supply, four wire/two wire system, explosion-proof/non explosion-proof, economical/standard segmentation meet your different needs. 4 measurement is not affected by fluid density, viscosity, pressure, temperature, the influence of the conductivity changes. 5 the photosensitive key, can avoid open operation; Chinese menu, according to the use of more convenient domestic users. 6 set menu quickly, guide for parameter setting, convenient and quick. Measurement of high reliability, good repeatability and long-term maintenance free. Range than 1000:18 provide current, frequency, pulse, Hart and profibus - PA，profibus- DP, FF, etc all kinds of output way choice. 2. The working principle of electromagnetic flowmeter measurement principle is based on Faraday's law of electromagnetic induction. When the conductive metal rod with a certain speed in vertical direction of the magnetic field lines exercise, the induced voltage is produced. In the electromagnetic flowmeter, the measuring tube conductive medium is equivalent to conducting metal rods in the Faraday experiment, up and down at the ends of the two electromagnetic coils generate constant magnetic field. When conducting medium flows, the induced voltage is produced. The inside of the pipe induced voltage produced two electrodes are measured. Measuring pipeline through non-conductive lined with rubber, such as teflon with fluid and measuring electrode electromagnetic isolation. Assumes that the electromagnetic induction coil produces magnetic field strength B is constant, the induced voltage Ue is proportional to fluid velocity v, pipeline cross-sectional area A is known, the volume flow Qv can be calculated by the following formula: electromagnetic flowmeter is made up of two most flow sensor and transmitter. Sensor tube fitted with excitation coil, excitation current to produce magnetic field through the measuring tube, a pair of electrodes in measuring tube wall in contact with the liquid phase, which leads to the induction electric potential, sent to the transmitter. The excitation current was provided by the transmitter. According to the transmitter and sensor assembly way classification, which has two kinds of separation type and size. In the sewage treatment technology of large diameter flowmeter are separation, part is installed on the ground, the other part on the ground.
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Abstract: The information on the structure and measurement principle of the micro flow metal rotor flow meter is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. The structure and measurement principle of micro flow metal rotor flowmeter: 1. Structure: It is mainly composed of three parts: a. Indicator (intelligent indicator, local indicator); b. Float; c. Conical measuring chamber. 2. Measuring principle: The measured medium is from the bottom. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the structure and measurement principle of the micro flow metal rotor flowmeter. Structure and measurement principle of micro flow metal rotor flowmeter: 1. Structure: It is mainly composed of three parts: a, indicator (intelligent indicator, local indicator); b, float; c, conical measuring chamber. 2. Measurement principle: When the measured medium passes through the conical measuring tube from bottom to top, the upper and lower ends of the float generate differential pressure to form a rising force. When the lifting force on the float is greater than the weight of the float immersed in the fluid, the float will rise and the annular gap will rise. The area increases accordingly, the fluid velocity at the annular gap decreases immediately, the differential pressure between the upper and lower ends of the float decreases, and the lifting force acting on the float also decreases. a height. The height of the float position corresponds to the flow rate of the measured medium. The float has a built-in magnetic steel. When the float moves up and down with the medium, the magnetic field changes with the movement of the float. a. For the local type, the rotating magnet in the local indicator is coupled with the magnetic steel in the float to rotate, and at the same time drive the pointer to indicate the flow rate at this time through the dial. b. For the intelligent type, the change of the magnetic field is converted into an electrical signal by a solid-state magnetic sensor in the intelligent indicator, and the flow rate is displayed through A/D conversion, microprocessor, D/A output, and LCD liquid crystal display. size and cumulative flow. Core Tip: The above is“For the technical introduction of micro flow metal rotor flowmeter, you can answer the questions from the sales staff or technical engineers of Zhongwei Company here, and learn more about the specifications, models, prices and other information of the flowmeter. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Structure and Measurement Principle of Micro Flow Metal Rotameter Meter'
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Mass flow meter calibration plays a crucial role in many industries, ensuring accuracy and reliability in measurements. With evolving technology and methodologies, innovative approaches to this calibration process have emerged. This article explores these new methodologies, shedding light on modern techniques that are transforming the landscape of mass flow meter calibration.

Introduction to Mass Flow Meter Calibration

Mass flow meters measure the rate of mass flow of a substance passing through a measurement point over a given time. Some industries that rely heavily on these measurements include oil and gas, chemical manufacturing, pharmaceuticals, and food and beverage production. Accurate calibration of these meters is essential because even minor errors can lead to significant discrepancies, costing industries millions of dollars annually.

In traditional methodologies, gravimetric and volumetric calibration methods have been the standard. However, these approaches often involve lengthy processes and can be influenced by environmental factors, which can compromise accuracy. This necessity for precision has catalyzed the innovation of new calibration techniques that promise greater accuracy, efficiency, and reliability.

Enhanced Gravimetric Methods

While gravimetric calibration methods have been a mainstay in the industry, recent advancements have refined this approach, making it more effective and easier to execute. Gravimetric calibration involves measuring the weight of a fluid moved by the mass flow meter over a set period. Traditional methods often required large scale setups and were time-consuming. However, modern enhancements have addressed many of these limitations.

Integration with advanced weighing systems that employ digital load cells can significantly enhance accuracy, providing real-time weight changes with improved precision. These modern load cells are not only quicker but also capable of data transmission via wireless communication technology, allowing for seamless monitoring and analysis.

Moreover, environmental controls such as temperature and humidity management systems are now integrated into these setups, ensuring that extraneous factors do not affect the measurement. This high level of control is vital, as even minor fluctuations in ambient conditions can result in significant calibration errors. With these advancements, enhanced gravimetric methods allow for faster and more accurate calibration processes, reducing downtime and improving overall efficiency.

Sonic Velocity Calibration

Sonic velocity calibration emerges as another innovative approach to mass flow meter calibration. This technique measures the speed of sound through the fluid to determine the flow rate. This method is particularly useful for gases but has also found applications in certain liquid calibrations.

Using advanced sonic transducers, this approach offers high precision in detecting flow rates. These sensors are capable of measuring frequency shifts due to the Doppler effect as sound waves travel through the moving fluid. By applying algorithms to these frequency changes, the mass flow rate can be accurately determined.

One key advantage of sonic velocity calibration is its non-invasive nature. Traditional methods often require the system to be taken offline, whereas sonic velocity techniques can be implemented with the system in operation, causing minimal disruption. The fast processing times and real-time data generation abilities make it an attractive alternative for industries requiring constant monitoring and quick calibration cycles.

Additionally, the technique minimizes the effects of temperature and pressure, common drawbacks in traditional methods. This self-correcting capability enhances its reliability, making it well-suited for natural gas pipelines, steam systems, and other high-temperature, high-pressure environments.

Correlational Calibration Techniques

Another innovative approach is correlational calibration, which involves real-time data analysis and pattern recognition to develop calibration models. This methodology leverages historical data from the flow meter and applies machine learning algorithms to establish correlations between different measurement parameters.

For instance, flow meters that experience slight deviations over time can have intricate calibration models built that factor in their specific wear patterns and environmental influences. This individualized calibration model can then make real-time adjustments, ensuring continuous high accuracy.

The advent of cloud computing and the Internet of Things (IoT) has further fueled the potential of correlational calibration. Sensors and monitoring devices can constantly feed data into cloud platforms, where sophisticated algorithms analyze and calibrate in real-time. This method not only ensures precision but also provides predictive analytics capabilities, allowing for preemptive maintenance and avoiding costly downtimes.

Implementing correlational calibration requires a robust data infrastructure and sophisticated analytical tools. However, the return on investment can be substantial, providing that the system remains finely tuned and highly accurate over its operational lifespan.

Automated Calibration Systems

The shift towards automation is another innovative leap in mass flow meter calibration. Automated calibration systems can perform calibration routines without human intervention, reducing human errors and increasing efficiency.

These systems typically involve robotic components that handle all aspects of the calibration process from setting up test rigs, running calibration routines to recording and analyzing data. By automating these tasks, the process is not only accelerated but also standardized, ensuring uniformity and reducing variability caused by manual procedures.

End-users can also benefit from automated systems through reduced labor costs and increased throughput. Moreover, automated calibration systems are designed to interface seamlessly with digital control systems and other industrial IoT solutions. Through advanced software, calibration data can be integrated into broader operational databases, enabling real-time oversight and long-term record-keeping.

Despite the high upfront investment, the long-term gains in efficiency and reduction in operational risks often justify the cost. The precision and reliability offered by automated systems are particularly critical in applications where accuracy is paramount, such as pharmaceutical manufacturing and high-purity chemical processes.

Optical Calibration Techniques

Optical methods represent one of the most cutting-edge developments in mass flow meter calibration. These techniques involve using laser and fiber optic technology to measure flow rates with unparalleled precision. Laser doppler velocimetry, for example, measures flow rates by analyzing the frequency shift in laser beams as they pass through a moving fluid.

Optical calibration techniques offer several advantages over traditional methods, including non-invasiveness, high precision, and the ability to measure in environments where traditional methods might fail. They can accurately measure the flow of multi-phase fluids or those with varying viscosities without significant interference, making them extremely versatile.

One notable application of optical techniques is in the calibration of flow meters used in complex chemical processes where traditional calibration methods may fail to provide accurate results due to the involvement of corrosive or reactive chemicals. The robustness of optical systems in such extreme environments positions them as a preferred method for many high-stakes applications.

Furthermore, advances in optical sensors and data processing algorithms continue to enhance the reliability and accuracy of these calibration techniques, pushing the boundaries of what is possible. Advancements in complementary fields, such as the development of high-durability optical fibers and miniaturized laser systems, continually support and expand the capabilities of optical calibration methods.

In summary, these innovative approaches, including enhanced gravimetric methods, sonic velocity calibration, correlational calibration, automated systems, and optical techniques, represent significant advancements in the field of mass flow meter calibration. As industries become increasingly reliant on precise measurements, these methods will play a crucial role in ensuring operational efficiency and cost-effectiveness.

Understanding these new calibration techniques and their applications can help industries make informed decisions about the best practices for their specific needs. Embracing these advancements in calibration technology will undoubtedly lead to better accuracy, improved efficiency, and increased operational reliability across various sectors. The continued development and integration of these innovative methods signify a promising future for mass flow meter calibration.

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