Quality Flow Meter Test | Types and Differences of Flow Meters

Flow Meters – Silver Automation Instruments

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1. What are the types of mass flow meters?

2. MFC mass flow controller

MFC (mass flow controller) is a stable flow device that can automatically control gas flow. MFC not only has the function of a mass flow meter, but also can set the flow rate as needed and automatically maintain the flow rate at the set value. Even if there are fluctuations in system pressure or changes in ambient temperature, MFC can ensure that the flow rate does not deviate from the set value. MFC can manually set flow values or be connected to a computer for automatic control. The working principle of MFC: The working principle of MFC mainly includes thermal, differential pressure, volumetric, Coriolis and other types, among which thermal MFC is currently the most widely used type. The core of a thermal MFC is a composite system that integrates sensing and control components. Its sensor module includes a constant power heating element (such as a hot wire) and two temperature detection elements (such as thermistors) symmetrically distributed upstream and downstream of the gas flow channel. When gas flows through a channel, the flowing medium carries away heat through convection, causing temperature gradients in upstream and downstream sensors. After the temperature detection element converts the temperature difference signal into an electrical signal, the controller compares the signal with the theoretical value corresponding to the preset flow rate in real time. By dynamically adjusting the power of the heating element to compensate for heat loss, the temperature field balance in the sensing area is maintained. This closed-loop control mechanism can calculate the actual flow rate through temperature difference and achieve contro

l accuracy of the set value through power feedback, ultimately achieving high stability control of gas mass flow rate. The components of MFC include flow sensors, splitter channels, flow regulating valves, and amplification controllers. After entering the intake end, the gas is divided into two paths, one through the flow sensor and the other through the gas path channel. The flow value measured by the sensor is compared with the set flow value to control the opening or closing of the valve, so that the measured value is consistent with the set value. Under the continuous action of the comparison circuit, when the air pressure or temperature changes within a certain range, the controller will make corresponding adjustments to maintain the stability of flow control. Application areas of MFC: Semiconductor industry: MFC plays an important role in the semiconductor manufacturing process, accurately controlling the flow rate and mixing ratio of gases, ensuring the stability of the production process and product quality. Chemical industry: In chemical production, MFC can handle various corrosive, flammable and explosive special gases, achieve accurate gas ratio and flow control, and improve production efficiency and safety. Laboratory equipment: MFC also has a wide range of applications in laboratory equipment, such as gas chromatographs, mass spectrometers, etc. It can accurately control the flow rate of gases, ensuring the accuracy and reliability of experimental results. Biomedical industry: In the field of biomedicine, MFC can accurately control the flow rate and mixing ratio of gases, meeting the special needs of cell culture, drug synthesis and other processes. Schematic diagram of MFC: From the schematic diagram, it ca

Quality Flow Meter Test | Types and Differences of Flow Meters

1. What are the types of mass flow meters?

2. MFC mass flow controller

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