> For the complete documentation index, see [llms.txt](https://docs.lorric.com/qr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lorric.com/qr/fu-tx310-ultrasonic-flowmeter-manual-chinese-v3/2.-an-zhuang-fang-shi/untitled-1/2.4.3-fei-hang-shi-jian.md).

# 2.4.3 飛行時間

顯示輸出介面的第七介面顯示所有相關於超音波飛行時間（Time of night, ToF）的值，畫面中TOM 代表量測到的飛行時間。TOS 代表計算出來的理論飛行時間這二組值理想上應為相等，因此若TOM/TOS 相除後得到的比率超出100 ±3％ 時，應該採取以下方法： 

● 檢查相關的設定參數是否正確？特別是管材質、管徑、是否有內襯流體、流體類型...等。 

● 探頭架設距離是否正確？ 

若>100%可調近上下游探頭距離。 

若<100%可調遠探頭距離。


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