A flow meter works by measuring the amount of a liquid, gas, or steam flowing through or around the flow meter sensors. Flow meter sensors work in different ways, but with the same end goal: Provide the most accurate and repeatable flow measurements for a specific application, whether for process control, general research activities, or semiconductor processing.
流量计测量体积或质量。流量（q）等于容量流量计中管道（a）的横截面区域，流动流体的速度（v）：q = a * v。质量流量计如下：ṁ= q ∗ρ（其中q是体积流量，ρ是流体密度）。
Mass flow rate is the key consideration in many cases, especially in combustion, chemical reactions, or buying and selling gases.
How Different Types of Meters Work
- 毛细管热质量- 使用在通过非常小的管（毛细管）和一组电阻温度探测器（RTD）的气体之间传递的热热来测量气体的质量流量。
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- Immersible Thermal Mass– Uses the thermal heat transferred from a heated sensor immersed in the flow to measure the mass flow of the gas.
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- 涡流脱落– Measures mass and/or volumetric flow of liquids, gases, and steam using vortices shed from a sensor immersed in the flow and a computed fluid density.
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- 运输时间超声波- 使用超声测量流体通过管道的速度，并可以安装在管道外部，从而消除了对管道切割的需求。
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How Will the Flow Meter Be Used?
下一步是找出用于测量的流量计：
- Costly products that need to be measured very precisely?
- 液体，气或蒸汽？
- Very large flows or only small flows?
- Low or high pressure and temperature of the liquid, gas, or steam in the pipe?
- Liquids, gases, or steam flowing in complicated or big piping arrangements?
最佳流量计工作技术的选择是基于上述问题的答案。肯定流量计测量不同的事物时工作良好。
- 涡流流量计非常适合在高温和压力下测量液体和蒸汽的流动
- Mass flow of gases from low to high flows can be precisely measured using thermal mass flow meters
- 当没有工艺关闭或管道切割是理想的情况下，运输时间超声流量计非常适合测量水或其他液体的流动
- Older technologies such as turbine meters, positive displacement, or differential pressure also have their place
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