Have you learned to distinguish between gas mass flow controllers and gas mass flow meters?

Gas mass flow controller and gas mass flow meter have you learned to distinguish between a gas mass flow controller (MFC) and a gas mass flow meter (MFM). MFC is a device with control gas mass flow, while MFM does not have control gas Devices with mass flow capability. MFC is the abbreviation of MassFlowntroller, that is, mass flow control. When the fluid flows in the rotating tube, it will generate a force on the tube wall. It was discovered by Coriolis in 1832 when he was studying the water turbine, and it is referred to as the Coriolis force. The mass flowmeter is based on the Coriolis force. There are two parallel T-shaped vibrating tubes inside the sensor. The driving coil is installed in the middle and the pickup coil is installed at both ends. When the excitation voltage provided by the transmitter is applied to the driving coil , the vibrating tube vibrates back and forth periodically, and the fluid medium in the industrial process flows through the vibrating tube of the sensor, which will produce a Coriolis force effect on the vibrating tube, causing the two vibrating tubes to vibrate torsionally, and the pickup coils installed at both ends of the vibrating tube will Two sets of signals with different phases are generated, and the difference between the two signals is proportional to the mass flow rate of the fluid passing through the sensor. The computer calculates the mass flow through the vibrating tube. When different media flow through the sensor, the main vibration frequency of the vibrating tube is different, and the density of the media is calculated accordingly. The platinum resistance installed on the vibration tube of the sensor can indirectly measure the temperature of the medium. The mass flowmeter directly measures the mass flow of the medium passing through the flowmeter, and can also measure the density of the medium and indirectly measure the temperature of the medium. Since the transmitter is an intelligent instrument with a single-chip microcomputer as the core, it can derive more than a dozen parameters for users to use according to the above three basic quantities. The mass flow meter is flexible in configuration, powerful in function, and high in performance and price ratio. It is a new generation of flow meter. A flow measuring instrument for measuring mass flow in a pipeline. When the measured fluid is under the condition of great changes in pressure, temperature and other parameters, if only the volume flow is measured, it will cause a large measurement error due to the change of the fluid density. In positive displacement and differential pressure flow meters, the density of the measured fluid may vary by 30%, which will cause a 30-40% error in the flow rate. With the increasing level of automation, many production processes have put forward new requirements for flow measurement. The course of a chemical reaction is controlled by the mass (rather than the volume) of the starting materials. The heating and cooling effects of steam and air flow are also proportional to the mass flow rate. Strict control of product quality, accurate cost accounting, machine and accurate fuel volume control also require accurate mass flow measurement. Therefore, the mass flow meter is an important flow measuring instrument. Mass flowmeters can be divided into two categories: one is the direct type, that is, the mass flow rate is directly output; the other is the indirect type or derivation type, such as the combination of an ultrasonic flowmeter and a density meter, and their outputs are multiplied to obtain Find the mass flow rate.

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