Flow Meter

Flow meters are indispensable measurement tools in industry, commerce, and daily life, used to accurately monitor the flow of liquids, gases, or vapors. With the advancement of science and technology, modern flowmeters come in a variety of types and are powerful, covering turbine, ultrasonic, electromagnetic, volumetric, and mass flowmeters to meet the different needs of various industries. Flow meters not only monitor the instantaneous flow of fluids in real time but also record the cumulative flow, providing important data support for production management. In the petrochemical, food and beverage, pharmaceutical, water supply, and other fields, the flow meter is widely used, and can effectively improve production efficiency, and reduce energy consumption, to ensure the safe operation of the system.

Different types of flow meters have their advantages. For example, the electromagnetic flowmeter is for highly conductive liquids, with high measurement accuracy, not affected by pressure, temperature, and other environmental changes. The turbine flowmeter with its high sensitivity, is suitable for low viscosity liquid measurement. Ultrasonic flowmeter contactless measurement method, in harsh environments, can also maintain efficient operation. Mass flowmeter can directly measure the mass flow of the fluid, without the need to compensate for temperature or pressure. No matter which type of flowmeter, choosing the right model and configuration is the key to ensuring accurate measurement and stable operation of the system.

Introduction to Flow Meters

Measurement is the eyes of industrial production. Flow measurement is one of the components of measurement science and technology, it has a close relationship with the national economy, national defense construction, and scientific research. Do a good job of this work, to ensure product quality, improve production efficiency, and promote the development of science and technology have an important role, especially in the energy crisis, the degree of automation of industrial production is becoming more and more high in today's era, the flow meter in the national economy, the status and role of the more obvious.

Engineering commonly uses unit m³ / h, which can be divided into instantaneous flow (Flow Rate) and cumulative flow (Total Flow), instantaneous flow is the amount of time per unit over the closed pipeline or nullah effective cross-section of the material flowing through the gas, liquids, solids; cumulative flow that is, for a certain period within the interval (one day, one week, one month, one year) fluid flow through the closed pipeline or nullah effective cross-section of the cumulative amount. Cumulative flow is the cumulative amount of fluid flowing through the effective cross-section of a closed pipe or open channel within a certain time interval (one day, one week, one month, one year). Through the instantaneous flow the time integral can also be obtained by the cumulative flow, so the instantaneous flowmeter and cumulative flowmeter can also be converted to each other.

Flow Meter Application Range

Flow measurement is widely used in industrial and agricultural production, national defense construction, scientific research, foreign trade, and people's lives in various fields. In the petroleum industry, from oil extraction, transportation, refining, and metallurgical processing to trade and sales, flow measurement throughout the process, any one of the links is inseparable from the flow measurement, otherwise it will not be able to ensure that the normal production of the petroleum industry and trade exchanges. In the chemical industry, inaccurate flow measurement will cause the chemical composition of the distribution ratio to be out of proportion, can not guarantee product quality, and serious production safety accidents will occur.

In the electric power industry, liquid, gas, steam, and other media flow measurement and regulation occupies an important position. Flow measurement is not only accurate or not to ensures that the power plant in the best parameters under operation has great economic significance, with the development of high-temperature, high-pressure large-capacity units, flow measurement has become an important link to ensure the safe operation of power plants. Such as large-capacity boiler instantaneous feedwater flow interruption or reduction, may cause serious dry boiler or pipe burst accidents. This requires that the flow measurement device should not only do accurate measurements but also promptly send an alarm signal. In the iron and steel industry, the steelmaking process of circulating water and oxygen (or air) flow measurement to ensure product quality is one of the important parameters. In the light industry, food, textile, and other industries are also inseparable from the flow measurement.

The application of more transducers is the external clip type and insertion type. The monoacoustic ultrasonic flowmeter structure is simple and easy to use, but this flowmeter on the flow distribution changes in poor adaptability, microelectronics, and computer technology, the rapid development of the meter greatly promotes the upgrading of new types of flowmeter such as spring out. So far, it is said that there are hundreds of flow meters in the market, and the field use of many difficult problems can be expected to be solved. Our country carries out the work of recent flow measurement technology relatively late, is set at the upstream end of the measurement flow channel 6 and relative to the orifices 11 and 12, for reducing the measured fluid flow into the orifices 11 and 12; a measurement control component 19 for measuring the propagation time of the ultrasonic waves between the ultrasonic transducers 8 and 9; and a calculation component 20 for calculating the flow rate based on the signals of this measurement control component 19.

The flowmeter tries to avoid ferromagnetic objects and equipment with strong electromagnetic fields (such as large motors, large transformers, etc.) so that the magnetic field does not affect the sensor's operating magnetic field and the flow signal. Sensor spoon converter between the flow signal line and the excitation line. However, from the lightning failure in the analysis of damaged parts, caused by the failure of the induction of high voltage and surge current most of the foot from the control room power lines introduced, the other two ways less. As the electromagnetic flowmeter measurement contains suspended solid phase or dirty bodies with far more opportunities than other flow meters, the probability of failure generated by the inner wall of the adhesion layer is relatively high. If the adhesion layer conductivity is similar to the liquid conductivity. Common commissioning period failure is usually by improper installation.

Selection Method

General selection can be considered from five aspects, these five aspects for flow meter instrument performance, fluid characteristics, installation conditions, environmental conditions, and economic factors. Five aspects of the detailed factors are as follows:

• Instrument Performance: Accuracy, repeatability, linearity, range, flow range, signal output characteristics, response time, pressure loss, and so on.
• Fluid Characteristics: Temperature, pressure, density, viscosity, chemical corrosion, abrasiveness, scaling, phase mixing, phase change, conductivity, speed of sound, thermal conductivity, specific heat capacity, and other entropy indices.
• Installation Conditions: Piping layout direction, flow direction, length of straight pipe section upstream and downstream of the test piece, pipe caliber, maintenance space, power supply, grounding, auxiliary equipment (filters, degassers), installation, and so on.
• Environmental Conditions: Ambient temperature, humidity, electromagnetic interference, safety, explosion-proof, pipeline vibration, and so on.
• Economic Factors: Instrument acquisition costs, installation costs, operating costs, calibration costs, maintenance costs, instrument life, spare parts, and so on.

Flow meter instrumentation selection steps are as follows:

1. According to the type of fluid and five considerations for the initial selection of available instrument types (to have several types to choose).
2. The initial selection of the type of data and price information collection, in-depth analysis, and comparison for the preparation of conditions.
3. The use of the elimination method gradually concentrated into 1 to 2 types, the five aspects of the factors to be repeatedly compared and analyzed to determine the final pre-selection of the target.

In the selection of a flowmeter, the user should based on the application requirements and media characteristics, comprehensive consideration of the flowmeter's accuracy, response time, pressure level, applicable temperature range, output signals, communication functions, and other factors. The right choice can not only effectively improve the measurement efficiency, but also reduce operating costs and extend the service life of the equipment. To ensure optimal performance of the flow meter, it is recommended that users perform regular calibration and maintenance during use to avoid degradation of accuracy caused by long-term operation.

Tool flowmeter catalog covers a wide range of types and sizes to meet the needs of piping systems from small diameters to high flow rates. Whether it's a laboratory application where high accuracy is required or real-time flow monitoring of a large industrial pipeline, you'll find the ideal solution here. We are committed to providing our customers with cost-effective flowmeter products, equipped with professional technical support and perfect after-sales service, to ensure that each device operates stably and accurately in the user's working environment. Choose the right flow meter to make your production process more efficient and safer.