What are the common influencing factors of gas mass flowmeters?

What are the common influencing factors of gas mass flowmeters? Gas mass flowmeter is a flow meter based on the principle of thermal diffusion. That is to say, when the fluid flows through the heating object, the heat loss of the heating object is proportional to the flow rate of the fluid. Specifically, the sensor of the flowmeter has two standard RTDs, one is used as a heat source, and the other is used to measure the temperature of the fluid. When the fluid passes through, the temperature difference between the two has a nonlinear relationship with the flow rate. , the instrument can convert this relationship into a linear output of the measured flow signal. There are two design methods for flowmeters manufactured using the principle of thermal diffusion: one is based on the principle of constant temperature difference; the other is based on the principle of constant power, based on a common data model: P/?T=A+B(Q)N. Among them: P---dissipated power, T---temperature difference between two sensors, Q---mass flow, N---exponential coefficient, A, B are coefficients related to the thermal properties of the gas. The principle of constant temperature difference: T remains unchanged, and the relationship between the dissipation power P and the flow rate Q of the fluid increases exponentially. The principle of constant power: the dissipated power is constant, the temperature difference ?T and the fluid flow Q are exponentially decreasing. Gas mass flowmeters are widely used in steel plants, coking plants, petroleum, chemical, thermal, medical, thermal power plants, environmental protection and other industries. The gas mass flowmeter is a real direct mass flowmeter, and the user does not need to compensate the pressure and temperature. The instrument has no moving parts, small pressure loss, wide range ratio, high precision, high reliability, simple installation and convenient operation. There are many factors that affect the flowmeter. Briefly talk about the common influencing factors: (1) Pressure The pressure of the gas measured by the CMF used in the gas dispenser is not lower than 20MPa, and the pressure is far greater than the atmospheric pressure. The high pressure changes the internal stress of the vibrating tube and increases the equivalent stiffness of the elastic tube, thereby increasing the vibration frequency of the vibrating tube and reducing the phase difference between the two tubes; when the gas flows through the vibrating tube, there is a pressure drop, which makes the vibrating tube The force is asymmetrical, which also affects the phase difference. (2) Temperature The working temperature of the CMF used for the dispenser is much lower than the room temperature, and the influence of temperature must be considered; the change of medium temperature or ambient temperature will change the Young's modulus of the measuring vibrating tube and affect the structure of zero drift and other factors. (3) Flow rate Compressed gas has low density and fast flow rate, and its influence cannot be ignored. Ideally, as the flow rate increases, the vibration frequency of the vibrating tube decreases. Generally, the change of fluid density is small, and it can be considered that the flow rate is proportional to the mass flow rate of the fluid. Therefore, the compensation of flow rate can be converted into a nonlinear factor of flow rate change for compensation.

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[拓展名称] include a great variety of devices with a wide range of complexity: from simple rosemount vortex flow meter used since prehistoric times to the complex of modern mechanized tuning fork liquid density meter.

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