TB806

TB806

用PT100電阻溫度傳感器測量溫度并監(jiān)視溫度

     本例討論如下內(nèi)容:用模擬量擴(kuò)展模塊EM235測量溫度和監(jiān)視溫限，在該模擬量模塊的一個輸入通道上連接PT100溫度傳感器。

為了把PT100的隨溫度變化的電阻轉(zhuǎn)換成電壓，模擬量輸出作為恒電流源而使用，即輸出12.5mA隨電流供給PT100傳感器。在這個電路中，產(chǎn)生了5mV/0C的線性輸入電壓。EM235把這個電壓轉(zhuǎn)換成數(shù)字量，程序周期性地讀這些數(shù)字量，并將所讀的這些數(shù)，利用下面的公式計(jì)算出溫度。

硬件描述

溫度傳感器:

PT100是鉑電阻溫度傳感器，它適用于測量-60到+400度之間的溫度。

計(jì)算PT100所需電流

PT100在0度時電阻為100，隨著溫度的變化電阻星線性變化，大約是每攝氏度0.4歐姆。

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