# 主畫面數據解讀

## 瞬時流量及誤差

本流量計的最大可能誤差為 0.5 % F.S. + 2.5 % O.R.，換算為在不同流速下最大可能誤差與顯示數據的關係如下圖：

![](/files/-LxsRWH_C_Gceh7yfWQL)

## 流速

本畫面顯示的數據為流量計三通管內的流速，在大多數的情形下會比同口徑的直管位置的流速稍快。

## 累積流量及歷史記錄

累積流量畫面在被人為歸零前會持續計數。

累積流量的上限是 999,999,999 Litre 。

歷史記錄的數據及流向來自累積流量參數 [C1](/qr/fp-as510-paddle-wheel-flowmeter-manual-chinese-v2/parameters.md#c-lei-ji-ji-li-shi-can-shu-lie-biao)。日期數據則來自參數 [G 分類](/qr/fp-as510-paddle-wheel-flowmeter-manual-chinese-v2/parameters.md#g-shi-jian-can-shu-lie-biao)。歷史記錄的流量數據依以下規則：

1. 若累積流量在某日(如 2020/01/01)沒有被歸零，則該日的數據是該日的23:59:59的數據減去前一日(如2019/12/31)的23:59:59的數據。
2. 若累積流量在某日有被歸零，則該日的數據就是該日的23:59:59的數據。

歷史記錄的日期數據依以下規則：

1. 已記錄過的數據不會被改變。所以若人為重新設定一個比之前記錄時間更早的日期。會發生新近日期與過去日期相同或更早的記錄。


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