What are the criteria for classifying turbine flowmeters?

　　Turbine flowmeter is a kind of velocity type flow measurement instrument, with high measurement accuracy, wide range ratio, simple structure and small pressure loss, it is used in petroleum, chemical industry, metallurgy, electric power, water supply and other fields. In order to meet the measurement needs of different industries and working conditions, turbine flowmeter has developed a variety of classification standards. In this article, we will introduce the classification standard of turbine flowmeter from different dimensions, to help you better understand and choose the right flowmeter.

　　First, according to the structure classification

　　According to the structure and measurement of different media, turbine flowmeter is mainly divided into the following categories.

　　1.1 Pipeline type turbine flowmeter

　　Pipeline type is a common type of turbine flowmeter, its structure is compact, installed in the middle of the pipeline, measuring the fluid flow through the pipeline. Applicable to a variety of liquid and gas flow measurement, especially in the pipeline diameter is small, wide range of flow rate applications.

　　1.2 Insertion type turbine flow meter

　　Insertion type turbine flowmeter through the flange or other connections mounted on the side wall of the pipeline, measuring the flow rate at a certain point in the pipeline, and then calculate the flow rate according to the cross-sectional area of the pipeline. The advantage is that it is easy to install, no need to cut the pipe, suitable for large pipe flow measurement.

　　1.3 Liquid-sealed turbine flowmeter

　　For some volatile, flammable and explosive or toxic media, the use of liquid seal design, the use of liquid isolation of the measured medium and the sensor to ensure the safety and reliability of measurement. Mainly used in petroleum, chemical and other special occasions.

　　1.4 Sanitary turbine flowmeter

　　Sanitary turbine flowmeter using materials and structural design in line with health standards, such as stainless steel, no dead space design, to meet the food, medicine and other industries on the strict requirements of health conditions.

　　Second, according to the sensor type classification

　　According to the different working principles of the sensor, the turbine flowmeter can be divided into.

　　2.1 Electromagnetic induction type turbine flowmeter

　　This is a common type, the sensor works using the principle of electromagnetic induction. When the conductive fluid flows through the turbine blade, the blade cuts the magnetic lines of force resulting in induction electromotive force, induction electromotive force frequency and flow is proportional to the frequency of induction electromotive force can be measured by detecting the flow rate.

　　2.2 Photoelectric turbine flow meter

　　This type of flowmeter in the turbine blade set up light shield, the use of photoelectric sensors to detect the shield on the light beam blocking, so as to measure the turbine speed, and then calculate the flow rate. Photoelectric sensor has the advantages of strong anti-interference ability, signal stability and so on.

　　2.3 Capacitive turbine flowmeter

　　Capacitive sensors use the capacitance change between the turbine blade and the electrode to detect the turbine speed, its structure is simple, high sensitivity, suitable for low flow measurement.

　　2.4 Ultrasonic turbine flowmeter

　　Ultrasonic turbine flowmeter using ultrasonic reflection principle to measure the turbine speed, with non-contact measurement, high accuracy, not affected by the nature of the medium and other advantages, but its cost is higher.

　　Third, according to the medium temperature classification

　　According to the different temperatures of the measurement medium, the turbine flowmeter can be divided into.

　　3.1 Normal temperature turbine flowmeter

　　Apply to the medium temperature in -20 ℃ ~ 80 ℃ range of flow measurement, this is a common type.

　　3.2 High-temperature turbine flowmeter

　　Apply to media temperature over 80 ℃, even up to 400 ℃ above the high temperature environment. This type of flowmeter using high temperature resistant materials and special structural design, such as high temperature bearings, thermal insulation measures.

　　3.3 Low temperature type turbine flowmeter

　　Apply to the medium temperature is lower than -20 ℃, or even as low as -196 ℃ of the low-temperature environment. This type of flowmeter using low-temperature materials and special sealing technology, such as low-temperature lubricating grease, bellows seal.

　　Fourth, according to other classification methods

　　In addition to the above classification criteria, the turbine flowmeter can also be classified according to other features, such as.

　　4.1 Explosion-proof turbine flowmeter

　　Suitable for flammable and explosive environments, the use of explosion-proof shell and circuit design to ensure the safety of measurement.

　　4.2 Intelligent turbine flowmeter

　　Integrated microprocessor and digital signal processing technology, with flow calculation, display, storage, communication and other functions, convenient for users to collect and analyze data.

　　4.3 Special application type turbine flowmeter

　　Developed for specific industries or working conditions of the flowmeter, such as turbine flowmeter for measuring natural gas, prepaid water meter for measuring water flow, and so on.

　　V. How to choose the right turbine flowmeter

　　Choosing the right turbine flowmeter needs to consider a number of factors, including:: the nature of the measurement medium: such as liquids, liquids, and water.

　　The nature of the measurement medium: such as liquid, gas, steam, corrosiveness of the medium, viscosity, temperature, pressure, etc.. Flow range and accuracy requirements: according to the actual working conditions to choose the appropriate range and accuracy level. Pipe size and installation method: according to the diameter of the pipe to choose pipeline or insertion type, and determine the installation method. Working environment: such as temperature, humidity, vibration, electromagnetic interference, etc. Cost budget: according to the actual needs of the choice of cost-effective and appropriate flowmeter. It is recommended that when choosing a turbine flowmeter, consult the technical personnel, according to the actual working conditions and technical requirements, to make comprehensive considerations, choose the right flowmeter, in order to ensure accurate and reliable measurement.