不同物理原理的電子式或機械式流量監控有各具優勢的測量方式。如根據熱傳導原理，介質的流速不同，則產生的熱量不同。

在線傳感器根據已知管道的橫截面來確定流量--首先檢測流速，然后根據流速計算流量。圖爾克FTCI系列流量傳感器可顯示當前流量，性能穩定，但不同的介質導熱系數不同，它通常僅適用于水或加入乙二醇的混合液。

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