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（一）测量时的水温应维持在摄氏25度左右，温度过高会使TDS值增加，影响正确性。

（二）液晶屏幕所显示的数值即为TDS值，若TDS计显示数字愈高，表示水中的物质愈多。

（三）一般地区磁化过的自来水平均在250ppm左右，如果是纯水系统能减至30ppm以下，当纯水的数值超过30ppm时，就必须考虑更换RO滤膜或请技术人员验修。

（一）TDS仅能测出水中的可导电物质，但无法测出细菌、病毒等物质。

（二）单独依赖TDS水质测试来判断水质是否能生饮，并不是特别正确的作法;经高温无法灭绝的细菌或病毒，必须透过更精密的仪器才能测出来。

⑴毫克（mg）/升表明1升水中有多少毫克溶解性总固体。

⑵PPM溶液百万分率浓度单位。指100万毫升溶液中含有溶质的毫升数或表明100万克溶液中含有溶质克数。

⑶换算关系：1mg/l=1PPM

（4）它和电导率往往存在一种相通的关系，有时候TDS也可以用来表示电导率，两者的关系：1TDS=2μS

其中μS为电导率的单位。

国家标准GB5749-2006《生活饮用水卫生标准》中对饮用自来水的溶解性总固体

影响TDS值测试的因素：（TDS）有限量要求：溶解性总固体≤1000mg/L

水温：TDS笔不可用于测量高温水体（例如：热开水）

水的流速：TDS笔不能用于测量晃动较大的水体

水质污染：TDS笔不能用于测量污染浓度较高的水体

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