Comparison of Thermal Gas Mass Flow Meters

The biggest advantage of the gas mass flowmeter with the principle of constant temperature difference is that it responds faster than the constant power gas mass flowmeter. Because the measured value of the constant power type is obtained from the actual temperature change, the thermal inertia of the mass of the measuring tube and the detection element will reduce the response speed; the temperature distribution of the constant temperature difference type does not change, and is not affected by the thermal inertia of the detection element and other masses. For the constant power gas mass flowmeter, it uses a constant power to heat the platinum resistance. Compared with the constant temperature difference gas mass flowmeter, it has the following advantages: (1) The maximum measurable flow rate of the constant power flowmeter is larger, As the medium flow increases, the heat of the heated platinum thermal resistance is quickly taken away. For the constant temperature difference flowmeter, it requires a rapid increase in the energy of the heated resistance to ensure a constant temperature difference. However, because the increase of energy is affected by the power of the circuit itself and the maximum allowable current of the heated platinum resistance, its maximum value is limited. The flow measurement of the constant power type is easy to realize. Usually, the maximum measurable speed of the flowmeter with the principle of constant power is 488m/s to the air, while the flowmeter with the principle of constant temperature difference can only reach 38m/s. (2) The constant power flowmeter is not easily affected by dirty and wet media. In order to make the constant temperature difference flowmeter respond quickly to the temperature and maintain a constant temperature difference, the platinum resistors are generally made relatively thin, while the constant power flowmeter can be made thick (the size of each manufacturer is different). In this way, when measuring dirty and wet media, dirty and wet substances may produce short-term attachments to platinum resistors (any manufacturer uses polishing treatment for platinum resistors, and long-term attachments are not easy to produce). For thinner platinum resistors, their attachments will have a greater impact on the heat dissipation of the heated platinum resistors, and in severe cases, the measurement accuracy will be greatly reduced. Constant power is much better for measuring dirty and wet media. (3) The constant temperature difference flowmeter does not compensate for temperature changes, but the constant power flowmeter can automatically compensate for the full range of temperature changes. *, the heat flow coefficient and equilibrium constant are changed by the change of temperature. Generally speaking, they are constant only in the range of 30°C. When the measured gas temperature range exceeds this value, the heat flow coefficient and equilibrium constant of the gas are both will change. Affected by circuit design, all constant temperature difference flowmeters on the market do not compensate for temperature, while FCI’s flowmeters using constant power can automatically compensate for thermal flow coefficients and equilibrium constants within the full temperature range. . It is difficult to keep constant the temperature range of the medium due to climate or other reasons. (4) Constant power and constant temperature difference have significant differences in high temperature resistance. At present, the highest temperature resistance of constant power can reach 454°C, while the flowmeter with constant temperature difference is generally within 260°C, which has a great difference in adaptability to the measurement of superheated steam.

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