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A major advantage of semiconductor gas flow controllers and quality flow meters is the specific data detected.

A major advantage of semiconductor gas flow controllers and quality flow meters is the specific data detected.

The key difference between semiconductor gas flow controllers and flow meters is that gas quality flow controllers can adjust the process flow through their own built-in PID control valve, automatically adjusting and controlling the valve opening to achieve control of gas quality flow. Gas quality flow meters mainly use sensors to sense the flow rate of the gas and output it to the data acquisition terminal. The biggest advantage of semiconductor gas flow controllers and quality flow meters is that the specific data detected is not affected by temperature and pressure, and users do not need to perform temperature and pressure compensation calculations. Quality flow controllers (MFCs) consist of a flow sensor, a diverter safety channel, a flow control valve, and an amplifier control board. The gas flow sensor uses a capillary thermal difference calorimetry principle to accurately measure the quality flow of gas (without temperature and pressure compensation). The flow data signal measured by the heating bridge circuit of the sensor is sent to the amplifier for amplification. After amplification, the flow detection voltage is compared with the set voltage, and then the error signal is amplified to control the regulating valve, and the closed-loop control system passes through the channel flow to make it the same as the set flow. The diverter determines the flow of the main channel. The flow display meter matched with the mass flow controller has an adjustable voltage regulator setting.

08

2023

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03

Precautions for operating semiconductor gas flow controllers?

Precautions for operating semiconductor gas flow controllers?

With the continuous advancement of science and technology, all walks of life have also developed greatly. The development prospects of semiconductor gas flow controllers are also very good, so the demand is increasing, and there are more and more manufacturers on the market. As a manufacturer, it is also very necessary for us to tell you about the precautions for operating semiconductor gas flow controllers. Interested partners can take a look together. Before using this semiconductor gas flow controller, many problems have accompanied everyone, so if you want to use it better, you need to understand some of its knowledge points. First of all, you should understand that a semiconductor gas flow controller is a product that can control a certain amount of gas, especially suitable for controlling the flow rate of multiple processes and controlling the proportion of different gases. Now this product has a wide range of applications and a wide range of working pressures. Our company's products can be used from vacuum to 10 MPa; it can be used for various gaseous media (including some corrosive gases such as HCL); the flow range is wide. However, when using it, remember that if the working conditions of the semiconductor gas flow controller change (such as changes in substances, large changes in working temperature, etc.), the instrument needs to be zeroed. At the same time, the instrument hose needs to be horizontally assembled and calibrated with a level. Otherwise,

18

2023

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02

Introduction to the principle of Shandong miniature thermal mass flow meter, come and collect it!

Introduction to the principle of Shandong miniature thermal mass flow meter, come and collect it!

The Shandong miniature thermal mass flow meter measures fluid mass flow rate by utilizing the changes in the temperature field generated when the working fluid flows through a pipe heated by an external heat source, or by utilizing the relationship between the energy required for the fluid temperature to rise to a certain value when heating the fluid and the fluid mass to measure the fluid mass flow rate. It is a type of flow meter. In China, it is commonly known as a calorimetric flow meter. It measures fluid mass flow rate by utilizing the changes in the temperature field generated when the fluid flows through a pipe heated by an external heat source, or by utilizing the relationship between the energy required for the fluid temperature to rise to a certain value when heating the fluid and the fluid mass to measure the fluid mass flow rate. It is typically used to measure the mass flow rate of gases. It features low pressure loss; a wide flow range; high accuracy, high repeatability, and high reliability; a design with no moving parts; and the ability to monitor and control very low gas flow rates. Using the change in heat (or temperature) of the heated fluid to measure the mass flow rate of the fluid has a long history. Early TMFs directly placed heating coils and temperature sensing elements into the fluid for direct contact, a type of contact flow meter. However, issues such as erosion and wear could not be effectively addressed and...

03

2023

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02

What is the measurement principle of Shandong miniature thermal mass flow meter?

What is the measurement principle of Shandong miniature thermal mass flow meter?

Shandong miniature thermal mass flow meter uses thermal measurement to measure flow rate by the molecular mass carried away by split molecules. Because it is a thermal measurement, the measurement results are not affected by changes in gas temperature and pressure. The Shandong miniature thermal mass flow meter is an accurate, fast, reliable, stable, and flexible flow measurement instrument that will be widely used in petroleum processing, chemical industry, and other fields. It is believed that it will show great potential in promoting flow measurement. The Shandong miniature thermal mass flow meter cannot control the flow rate; it can only detect the mass flow rate of liquid or gas, and output the flow rate value through analog voltage, current, or serial communication. However, a mass flow controller is an instrument that can detect and control simultaneously. In addition to the measurement part, the mass flow controller itself also has an electromagnetic regulating valve or a piezoelectric valve, so that the mass flow controller itself constitutes a closed-loop system for controlling the mass flow rate of the fluid. The set value of the flow controller can be provided by analog voltage, analog current, or computer or PLC. How to handle the failure of the Shandong miniature thermal mass flow meter? 1. Hardware failure. If the error is too large, the integrator display is not lit or increases, and the display is blank, the reasons are as follows: A. Non-standard installation of the Shandong miniature thermal mass flow meter will directly lead to zero drift of the flow meter, such as Shandong

21

2022

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12

What is a Shandong miniature thermal mass flow meter?

What is a Shandong miniature thermal mass flow meter?

In scientific research, production process control, quality management, economic accounting, and trade handover, the quantity of fluid involved is generally mass. Only the volumetric flow rate of fluid measured by Shandong miniature thermal mass flow meter cannot meet people's requirements, and it is usually necessary to try to obtain the mass flow rate of the fluid. In the past, the mass of fluid could only be obtained indirectly through correction, conversion, and compensation after measuring parameters such as temperature, pressure, density, and volume of the fluid. This measurement method has many intermediate links, and it is difficult to ensure and improve the accuracy of mass flow measurement. With the development of modern science and technology, the emergence of Shandong miniature thermal mass flow meter has promoted the progress of flow measurement technology. When fluid flows in a rotating pipe, it will exert force on the pipe wall. The Shandong miniature thermal mass flow meter was discovered by Coriolis in 1832 when studying turbines, referred to as Coriolis force. In 1977, based on this principle, the Shandong miniature thermal mass flow meter was developed. The Shandong miniature thermal mass flow meter is based on the Coriolis force. There are two parallel flow tubes inside the sensor, with a drive coil in the middle and detection coils at both ends. When the excitation voltage provided by the transmitter is applied to the drive coil, the vibrating tube vibrates in a reciprocating cycle. When the fluid medium in the industrial process flows through the vibrating tube of the sensor,

05

2022

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12

A one-minute introduction to the classification of Shandong miniature thermal mass flow meters

A one-minute introduction to the classification of Shandong miniature thermal mass flow meters

Shandong miniature thermal mass flow meters can be divided into two categories: one is direct, which directly outputs mass flow; the other is indirect or derivative, such as the combination of ultrasonic flow meter and density meter, multiplying their outputs to obtain mass flow. 1. Direct type. There are many types of direct Shandong miniature thermal mass flow meters, such as calorimetric, angular momentum, gyroscopic and twin-rotor types. This instrument is suitable for measuring small flow rates of gas, but its disadvantage is inertia. The measured value is related to the specific heat of the gas under constant pressure, and the measuring element is easily contaminated and corroded when it contacts the medium. The Shandong miniature thermal mass flow meter is a double orifice plate differential pressure mass flow meter. Two identical orifice plates are installed on pipes A and b. Two identical constant flow pumps are installed in the branch pipe, which can produce constant volume flow Q in opposite directions. 2. Indirect type. There are mainly three types of indirect Shandong miniature thermal mass flow meters: the combination of velocity flow meter and density meter, the combination of throttling flow meter and volumetric flow meter, and the combination of throttling flow meter and density meter. Another method is to convert the measured value of the volumetric flow meter into the volume flow under standard conditions according to the working pressure and temperature of the fluid. However, when the type or composition of the medium changes, the Shandong miniature thermal mass flow meter

24

2022

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11

The advantages of Shandong miniature thermal mass flow meters mainly include the following aspects

The advantages of Shandong miniature thermal mass flow meters mainly include the following aspects

Shandong miniature thermal mass flow meter was developed in the 1970s and is an important international dynamic measurement method. In the trade settlement of the petrochemical industry, Shandong miniature thermal mass flow meter plays an important role. The metering error of Shandong miniature thermal mass flow meter not only directly affects the economic benefits of enterprises, but also supervises the supply and demand balance of materials in various production devices. However, in the actual use process, due to the lack of familiarity with the structure, working principle and working conditions of Shandong miniature thermal mass flow meter, metering inaccuracy often occurs. Shandong miniature thermal mass flow meter is a measuring instrument that can effectively and accurately measure the mass flow rate of fluid in a closed pipe. Its working principle is simple, that is, according to the flow characteristics of fluid in a closed pipe, namely, the fluid maintains linear motion and rotation will produce a force proportional to the mass flow rate, according to which the corresponding measuring instrument can be manufactured. 1. The measuring range is relatively high, generally can reach 20:1 to 50:1, some instruments measuring range can exceed 100:1; 2. It can effectively and directly measure the flow rate, with high accuracy and good stability; 3. It can be used for a wide range of media and is suitable for measuring turbid natural gas; 4. Shandong miniature thermal mass flow meter can effectively perform

07

2022

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11

Introduction to the main applications of thermal helium mass flow meters

Introduction to the main applications of thermal helium mass flow meters

Thermal helium mass flow meters directly measure the mass flow rate of the medium passing through the flow meter, as well as the density and indirectly the temperature of the medium. Because the transmitter is an intelligent instrument with a single-chip microcomputer as its core, it can derive more than a dozen parameters for user use based on the above three basic quantities. Thermal helium mass flow meters are a new generation of flow meters with flexible configuration, powerful functions, and high cost performance. Main applications: mainly used to measure the mass flow rate, total amount, and density of the medium. It can also measure volumetric flow rate and total amount, medium temperature, water content, alcohol content, concentration of two uniformly mixed liquids, and raw material ratio of the process. It is mainly used in the petroleum industry, such as crude oil production, water content, single-well production, crude oil transportation; chemical industry, food, pharmaceutical manufacturing industry, such as drug liquid production; papermaking, such as pulp; textile printing and dyeing; energy transportation, such as liquefied gas; environmental protection, such as sewage treatment; and measurement of slurry density during desulfurization. Thermal helium mass flow meters play a very effective role in various aspects such as material batching and batch metering, material flow measurement and control, fast and variable density measurement, and product quality monitoring. With the improvement of automation level, many production processes have put forward new requirements for flow measurement. Chemical reactions are controlled by the mass (not volume) of raw materials.

13

2022

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10

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