問題 · 2026-05-20
香港水務署水錶敏感度因型號而異,機械式較低,電子式(超聲波/電磁)較高,均須符合ISO 4064標準。
香港水務署使用的水錶並無單一固定敏感度數值,而是按型號、口徑與流量範圍而定 [1][2]。機械式水錶利用葉輪轉動,對極微細流量敏感度相對較低,可能無法即時察覺每小時僅數滴的極微量滲漏。近年署方推行智能水錶,採用超聲波或電磁感應技術,能精確偵測極低流量,敏感度遠高於傳統水錶 [3]。所有安裝水錶均須符合國際標準ISO 4064的準確度要求 [2]。技術規範中主要以最小流量Q1、常用流量Q3、過載流量Q4等指標界定性能。若懷疑水錶不準,可向水務署申請測試,誤差超過±3%通常會更換 [4]。
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