Analysis of advantages and disadvantages of mass flow controller

The mass flow controller can not only detect the total flow, but also automatically control the total flow during detection. Customers can set the total flow according to their needs. Generally, such mass flow meters are used only for flow measurement or monitoring. The flow controller adopts the principle of capillary heat transfer thermodifferential heat method to detect the mass flow of gas (no temperature and burden to deal with). The total flow signal measured by the thermal bridge of the sensor is sent to the amplifier for adjustment. Compare the increased flow detection voltage with the set voltage, and increase the differential signal to adjust the regulating valve. The closed-loop control flow through the channels equalizes the set total flow. The splitter depends on the total flow in the main channel. The total flow display instrument configured with this device has regulated power supply, digital voltmeter, potentiometer, peripheral equipment, internal conversion and three-position valve-controlled control switch, etc. This controller is required when the total flow needs to be adjusted. For example, compared with the detection of the total flow of the capillary, when the total flow is detected under constant pressure, a mass flowmeter is used; when the total flow is detected under constant pressure, this equipment is still required. It should be noted that when the mass flow controller is in a clean state, it can also be used as a mass flow meter, but the air pressure drop is greater than that of ordinary mass flow meters. Advantages of the controller: 1. The detection and adjustment of the total flow will not be inaccurate due to fluctuations in temperature or load. 2. Intelligent detection and adjustment 3. Accurately adjust the total flow according to the amount 4. Wide application range Controller disadvantages: 1. Analysis of the cause of fear of dust: as long as dust enters the flowmeter, it will block the sensor and shunt, resulting in measurement errors. At that time, it is necessary to install a filter before the air inlet; 2. Fear of liquid and oil entering the MFC Cause analysis: it will cause out of control, as long as the MFC inlet and outlet are connected with a liquid tank, a check valve should be installed at the MFC outlet to prevent Liquid backflow; 3. Reason analysis for fear of using wet corrosive gas: wet corrosive gas will rust stainless steel and damage the MFC channel. Therefore, before using corrosive gas, it is necessary to dry the gas and MFC pipeline procedures; 4. Fear of using highly corrosive, flammable, explosive, toxic and other hazardous gases Reason analysis: It will cause equipment damage or cause more serious losses.

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