Thermal gas mass flow meters are based on the principle of thermal diffusion

Due to the continuous development of the thermal gas mass flowmeter based on the principle of thermal diffusion, that is, 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 and RTDs, which have been used as a heat source and used to measure the temperature of the fluid. When the fluid flows through, the heat loss of the heat source has a nonlinear relationship with the flow rate, and the quality of the thermal gas The flow meter can convert this relationship into a linear output of the measured flow signal. The development advantages of flowmeters are becoming more and more obvious. In many large-scale industrial production sites, our measuring instruments are used more and more widely. Therefore, thermal gas mass flowmeters are widely used in petroleum, chemical, semiconductor, medical equipment, bioengineering, combustion control, metering, food, metallurgy, and other fields for precise measurement and automatic control of gas mass flow. It can be standard Input and output signals can realize the central control of the computer. The characteristics of thermal mass flowmeter: sensitive in small range, affected by temperature and pressure, directly measure the quality of gas, pressure loss can be ignored, and can realize high-precision measurement of large diameter and small flow. The principle of thermal mass flowmeter: it is a flowmeter based on the principle of thermal diffusion. In layman's terms, when a heat source is placed in a fluid, the heat of the heat source itself will be lost when the fluid passes through it. The greater the mass flow rate of the fluid, the greater the heat loss of the heat source. The flow rate of such a fluid should ideally be equal to the heat loss from the heat source. Therefore, knowing the magnitude of the heat, we can obtain the flow rate of the fluid. Specifically for the realization of the thermal gas mass flowmeter, it is: the probe of the thermal flowmeter has two probes, one of which is a reference point, used to measure the temperature of the fluid; the other is a heating source, used as a heat source. According to the above, we can have the following formula: thermal mass flowmeter is more convenient to use and install, and it has two forms: plug-in type and pipeline type. Whether it is plug-in type or pipeline type, the maintenance and operation are extremely simple. When installing, it should be noted that the direction of the fluid should be the same as that indicated by the thermal flowmeter. Disadvantages of thermal mass flowmeter: It is not suitable for installation in environments with high viscosity; it is not suitable for installation in places with water droplet content above 40%.

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