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（一）測(cè)量時(shí)的水溫應(yīng)維持在攝氏25度左右，溫度過高會(huì)使TDS值增加，影響正確性。

（二）液晶屏幕所顯示的數(shù)值即為TDS值，若TDS計(jì)顯示數(shù)字愈高，表示水中的物質(zhì)愈多。

（三）一般地區(qū)磁化過的自來水平均在250ppm左右，如果是純水系統(tǒng)能減至30ppm以下，當(dāng)純水的數(shù)值超過30ppm時(shí)，就必須考慮更換RO濾膜或請(qǐng)技術(shù)人員驗(yàn)修。

（一）TDS僅能測(cè)出水中的可導(dǎo)電物質(zhì)，但無法測(cè)出細(xì)菌、病毒等物質(zhì)。

（二）單獨(dú)依賴TDS水質(zhì)測(cè)試來判斷水質(zhì)是否能生飲，并不是較正確的作法;經(jīng)高溫?zé)o法滅絕的細(xì)菌或病毒，必須透過更精密的儀器才能測(cè)出來。

⑴毫克（mg）/升表明1升水中有多少毫克溶解性總固體。

⑵PPM溶液百萬(wàn)分率濃度單位。指100萬(wàn)毫升溶液中含有溶質(zhì)的毫升數(shù)或表明100萬(wàn)克溶液中含有溶質(zhì)克數(shù)。

⑶換算關(guān)系：1mg/l=1PPM

（4）它和電導(dǎo)率往往存在一種相通的關(guān)系，有時(shí)候TDS也可以用來表示電導(dǎo)率，兩者的關(guān)系：1TDS=2μS

其中μS為電導(dǎo)率的單位。

國(guó)家標(biāo)準(zhǔn)GB5749-2006《生活飲用水衛(wèi)生標(biāo)準(zhǔn)》中對(duì)飲用自來水的溶解性總固體

影響TDS值測(cè)試的因素：（TDS）有限量要求：溶解性總固體≤1000mg/L

水溫：TDS筆不可用于測(cè)量高溫水體（例如：熱開水）

水的流速：TDS筆不能用于測(cè)量晃動(dòng)較大的水體

水質(zhì)污染：TDS筆不能用于測(cè)量污染濃度較高的水體

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