> 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/2.1-dian-yuan.md).

# 2.1 電源

若沒有購買本公司的變壓器，本儀器適用電源為DC 9-30V 直流，外部電源最小電流供應能力需大於1A，消耗電流會隨著輸入的電壓而改變，但總消耗功率是恆定小於2W。接線時注意正負極性，請參考儀表外殼上的標示或依照下圖進行，錯誤的極性會導致儀表無法工作甚至可能損壞。

![](/files/-Lx-3UwjaQ7Wzkl5mQ1Q)

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