A one-minute introduction to the classification of Shandong miniature thermal mass flow meters
Release time：
24 Nov,2022
Summary
Shandong Miniature Thermal Mass Flow Meter These can be divided into two categories: one is direct, which directly outputs mass flow; the other is indirect or derivative, such as using a combination of ultrasonic flow meter and density meter, multiplying their outputs to obtain mass flow.
1. Direct. Direct Shandong Miniature Thermal Mass Flow Meter There are many types, such as calorimetric, angular momentum, gyroscopic, and twin-rotor types. This instrument is suitable for measuring small gas flows, but its disadvantage is inertia. The measured value is related to the specific heat of the gas under constant pressure, and the measuring element is easily contaminated and corroded when in contact with the medium. Shandong Miniature Thermal Mass Flow Meter is a double orifice plate differential pressure mass flow meter. In the pipeline Two identical orifice plates are installed on A and b. Two identical constant flow pumps are installed in the branch pipe, which can generate constant volume flow Q in opposite directions.
2. Indirect. Indirect Shandong Miniature Thermal Mass Flow Meter There are mainly three types: a combination of velocity flow meter and density meter, a combination of throttling flow meter and volumetric flow meter, and a combination of throttling flow meter and density meter.
Another method is to convert the measured value of the volumetric flow meter into the volume flow under standard conditions according to the working pressure and temperature of the fluid. However, when the type or composition of the medium changes, Shandong Miniature Thermal Mass Flow Meter accurate mass flow cannot be given.
3. Thermal. Shandong Miniature Thermal Mass Flow Meter The basic principle is to use an external heat source to heat the fluid to be measured in the pipeline, and the heat energy flows with the fluid. By measuring the heat (temperature) change caused by the fluid flow to reflect the mass flow of the fluid.
When the composition of the fluid is determined, the specific heat of the fluid under constant pressure is a known constant. Therefore, it can be seen from the above formula that if the heating power remains unchanged, Shandong Miniature Thermal Mass Flow Meter the mass flow can be calculated by measuring the temperature difference; if the constant temperature difference method is adopted, that is, the temperature difference between the two points is kept constant, the mass flow can also be obtained by measuring the heating power. Because the constant temperature difference method is simple and easy to implement, it has many practical applications. This type of flow meter is mostly used for measuring atmospheric gas flow.
In order to prevent the temperature measuring and heating elements from being contaminated and corroded by the fluid due to direct contact with the fluid to be measured, Shandong Miniature Thermal Mass Flow Meter a non-contact measurement method can be adopted, that is, the heater and temperature measuring element are installed outside the thin-walled pipe, and the fluid passes through the inside of the thin-walled pipe. The non-contact measurement method is suitable for micro-flow measurement in small-diameter pipes. When used for large-flow measurement, the flow splitting method can be adopted, that is, only part of the split flow is measured, and then the total flow is obtained to expand the measurement range.
4. Differential pressure. Differential pressure Shandong Miniature Thermal Mass Flow Meter Based on the Magnus effect. In practical applications, a combination of orifice plate and quantitative pump is used to measure mass flow. Common structures include two types: double orifice plate and four orifice plate combined with quantitative pump. Double orifice plate structure, that is, two orifice plates with the same structure and size are installed on the main pipe A and B, and two quantitative pumps with opposite flow directions and fixed flow rates are installed on the branch pipe. The differential pressure gauge is connected to the inlet of orifice plate A and the outlet of orifice plate b.
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