問題 · 2026-05-20

最少流量Q 1即係幾多呢?

Q1最小流量無固定值,由水錶口徑與測量幅度比R值決定,範圍從每小時數公升至數百公升不等。

最小流量Q1並非固定數值,而是根據水錶型號、口徑與測量幅度比R值而定[1][2]。以ISO 4064標準為基準,15毫米口徑機械式水錶若R值為80,Q1約為每小時20公升;智能水錶或R值較高的型號,Q1可低至每小時數公升[2]。水務署採用的水錶Q1範圍廣泛,從約0.0156 m³/h(每小時15.6公升)到1.8 m³/h(每小時1800公升)都有[1]。當實際流量低於Q1時,水錶測量誤差會顯著增加,甚至無法記錄,因此Q1越小代表水錶對微小流量的偵測能力越強。

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