Why the smaller the range ratio of the mass flow meter is, the larger the pressure drop is?

Why the smaller the range ratio of the mass flowmeter, the greater the pressure drop? The mass flowmeter can measure the quality of the fluid medium and the density of the fluid medium. The turndown ratio of the meter will affect its own measurement accuracy, but it has not been heard that it will cause a pressure drop. The mass flowmeter is a mass detection instrument made according to the Coriolis force effect, so the detection of the mass flowmeter is not affected by temperature, pressure, flow rate, density, viscosity, etc. The mass flowmeter has high detection accuracy, wide range, high reliability, and less post-maintenance. When measuring the mass flow of a fluid medium, the density of the fluid medium can also be measured. Its output signal is 4-20maDC analog signal, and can output frequency signal at the same time, which can be better compatible with the computer and form a complete intrinsically safe system. Due to the above characteristics of the mass flow meter, although it is expensive, it is popular in the industrial automation production process, so it has been rapidly promoted and applied. The mass flowmeter consists of sensors, transmitters, and display instruments. work. The shape of the measuring tube of the detecting element sensor varies from manufacturer to manufacturer. For example, the measuring tube of the mass flowmeter produced by Rosemount Company in the United States is a U-shaped tube, while the measuring tube produced by Engels-House (E+H) in Germany is a straight tube. Although the manufacturers are different, the principles of the sensor industry are the same. The fluid medium vibrates the measuring tube through the excitation coil, and the fluid medium generates Ge-type force in the vibrating tube. Since the Ge-type forces generated by the fluid medium at the inlet and outlet of the measuring tube are equal in magnitude and opposite in direction, the vibrating tube will be twisted. The fluid medium passes through the electromagnetic detector or photoelectric detector, and the distortion generated by the measuring tube is converted into an electrical signal and output to the transmitter for further processing. The transmitter converts the sent electrical signal into a low signal or binary signal, then transforms and amplifies it, and then outputs an electrical signal (4-20mADC) or frequency and pulse signal proportional to the flow and density. According to the title, the turndown ratio is related to the pressure drop. From the perspective of its working principle or working process, there is not much connection.

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