Mass flowmeter scale ( MFC） Principle and how to choose to use

Abstract: the mass flowmeter scale ( MFC） Principle and how to choose to use the information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. To some of the gas in the vacuum coating applied to auxiliary implementation we need technology, but the size of traffic and how to control? This is what we want to tell you. First of all, what is the mass flowmeter ( MFC） 吗? Mass flowmeter, the Mass Flow Meter ( Shrinkage. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a mass flowmeter scale ( MFC） Principle and how to choose to use the article details. To some of the gas in the vacuum coating applied to auxiliary implementation we need technology, but the size of traffic and how to control? This is what we want to tell you. First of all, what is the mass flowmeter ( MFC） 吗? Mass flowmeter, the Mass Flow Meter ( Abbreviation for MFM) , is a kind of accurate measurement of gas flow meter and the measured values are not controlled by fluctuations in temperature or pressure, do not need to temperature and pressure compensation. Mass Flow Controller, the Mass Flow Controller ( Abbreviation for MFC) , not only has the function of the mass flowmeter, and, more importantly, it can automatically control the gas flow, the user can set according to the need for flow, MFC will automatically flow rate constant on the set value, even if the system pressure fluctuations or ambient temperature changes, also won't make it deviates from the set point. Say simply, mass flow controller is a steady flow device, is a manual or automatic control and computer connection of gas steady flow device. The main advantage of the mass flowmeter/mass flow controller is what? （ 1) Flow measurement and control is not due to fluctuations in temperature or pressure falloff. For most of the flow measurement and control system, it is difficult to avoid the system pressure fluctuations and the temperature changes of environment and medium. For ordinary flowmeter, pressure and temperature fluctuations will lead to a larger error; For mass flowmeter/mass flow controller, and is generally negligible. （ 2) Measurement control automation of mass flowmeter/mass flow controller can be flow measurement value to output standard electrical signal output. It is easy to implement digital display of flow, cumulative flow automatic measurement, data recording, computer management, etc. For mass flow controller, also can realize automatic control of flow rate. Usually, the simulation of the MFC/MFM input and output signals of 0 ~ + 5 v or 4 ~ 20 ma, digital MFC/MFM is also equipped with RS232 or RS485 digital serial communication port, can very easily connected to the computer, automatic control. （ 3) A precise quantitative control flow mass flow controller can precisely control the gas to quantitative, this for a lot of process flow control, especially useful to the proportion of different gas control and so on. （ 4) Applicable scope wide, has a wide scope of work pressure, our products can be from vacuum until 10 mpa; Can be applied to a variety of gas medium ( Include some corrosive gases, such as HCL) ； Have a wide flow range, our product zui small flow range of 0 ~ 5 SCCM, zui SLM large flow range of 0 ~ 200. Flow display resolution can reach full range of 0. 1%, flow control range is 2 ~ 100% of full scale ( Range than for - - 50:1) , so is widely used in many fields. Mass flow controller operating differential pressure range is a what concept? Mass flow controller ( MFC） Set in a gas flow control valve, the valve can be made by the flow controller from zero adjustment to measuring the full range, in the process of work, the controller between the entry and exit of produces a pressure drop, the pressure difference. MFC operating differential pressure range is usually to 0. 1 to 0. If 3 mpa, in low differential pressure lower than that of zui ( 0. 1 MPa） , it is possible to control short of full scale value; If the above zui high value ( 0. 3MPa） , it is possible that closing flow rate not less than 2% F. S。 When users use MFC, regardless of the user work reaction chamber is a vacuum or high pressure, should be keep MFC in and out of gas at the ends of the differential pressure required differential pressure range, and air pressure to be relatively stable. Use volatile liquid evaporation vapour pressure is low, how to customize the low pressure drop of the mass flow controller products? Some users use volatile liquid evaporating steam gas source ( Such as acetone, etc. ) Using ordinary MFC, pressure is very low, can't work normally.
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