不同物理原理的电子式或机械式流量监控有各具优势的测量方式。如根据热传导原理，介质的流速不同，则产生的热量不同。
在线传感器根据已知管道的横截面来确定流量--首先检测流速，然后根据流速计算流量。图尔克FTCI系列流量传感器可显示当前流量，性能稳定，但不同的介质导热系数不同，它通常仅适用于水或加入乙二醇的混合液。
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