對于聰明的玻璃管液位計進一步分析儀器電源和阻抗匹配應用，我們首先需要了解智能玻璃管液位計的(de)基本原理。來自兩(liang)個H形硅(gui)梁諧(xie)振(zhen)分別(bie)差動傳感器(qi)(qi)，所(suo)述壓(ya)力信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)轉換成頻(pin)(pin)率信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)，給脈(mo)沖計(ji)數(shu)器(qi)(qi)，則差頻(pin)(pin)信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)被直接傳送到CPU進(jin)行處理智能(neng)(neng)玻(bo)璃管(guan)液位(wei)計(ji)振(zhen)動；由d/a轉換器(qi)(qi)為輸出(chu)信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)和輸入(ru)(ru)信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)對(dui)應為4-20mAdc和用(yong)于通信(xin)(xin)(xin)(xin)(xin)(xin)的(de)模擬信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)上(shang)疊(die)加(jia)BRAIN/HART數(shu)字(zi)信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)。膠囊組件內置(zhi)特性校(xiao)(xiao)正(zheng)存儲(chu)器(qi)(qi)，用(yong)于存儲(chu)所(suo)述傳感器(qi)(qi)溫度，靜壓(ya)，通過(guo)CPU類型玻(bo)璃管(guan)液位(wei)計(ji)輸入(ru)(ru)-輸出(chu)特性校(xiao)(xiao)正(zheng)數(shu)據(ju)的(de)輸入(ru)(ru)操作。通過(guo)I/O端口發送與外部裝置(zhi)（例如.g.，手持(chi)和BT275或BT200與在數(shu)字(zi)數(shu)據(ju)通信(xin)(xin)(xin)(xin)(xin)(xin)在DCSI/O卡(ka)通信(xin)(xin)(xin)(xin)(xin)(xin)功(gong)能(neng)(neng)）的(de)智能(neng)(neng)終端，疊(die)加(jia)在4-20mA信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)線(xian)為4-20mA信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)的(de)數(shu)字(zi)信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)不產生任何干擾影(ying)響。

在實(shi)際的(de)現(xian)場應(ying)(ying)用(yong)智(zhi)(zhi)能玻(bo)璃(li)管(guan)液位計經(jing)常遇到醉(zui)是儀器(qi)(qi)(qi)電(dian)源和(he)阻抗匹配問題，除了ST3000智(zhi)(zhi)能變(bian)(bian)(bian)送器(qi)(qi)(qi)EJA等智(zhi)(zhi)能變(bian)(bian)(bian)送器(qi)(qi)(qi)也有同樣的(de)問題。智(zhi)(zhi)能變(bian)(bian)(bian)送器(qi)(qi)(qi)3051醉(zui)大(da)負載電(dian)阻和(he)電(dian)源電(dian)壓(ya)需要滿足在圖(tu)中所示(shi)的(de)羅斯(si)蒙特(te)對應(ying)(ying)關系.5，我，R=43.5×（U-10.5），也稱為脈動直流電(dian)源應(ying)(ying)該小于2%時，CSA.發射器(qi)(qi)(qi)，所述電(dian)源電(dian)壓(ya)不(bu)能超(chao)過42.4V。可見，智(zhi)(zhi)能變(bian)(bian)(bian)送器(qi)(qi)(qi)都在幅(fu)度和(he)負載電(dian)阻醉(zui)低(di)工作電(dian)壓(ya)的(de)嚴格要求，應(ying)(ying)用(yong)程序還(huan)需要特(te)別注意。

在使用(yong)(yong)和(he)維護過程(cheng)中，要(yao)仔(zi)細(xi)閱讀(du)智(zhi)(zhi)能(neng)變送器(qi)(qi)與DCS系統(tong)數據(ju)；對于深現場儀表和(he)DCS系統(tong)啟(qi)動和(he)運行做的技術(shu)要(yao)求(qiu)詳細(xi)的討論；并結合工作實際，發揮智(zhi)(zhi)能(neng)電(dian)表的工程(cheng)技術(shu)人員處理智(zhi)(zhi)能(neng)變送器(qi)(qi)供電(dian)電(dian)源和(he)阻抗匹配的問(wen)題，從而為提高儀器(qi)(qi)保持(chi)水平，同(tong)時(shi)也為推廣使用(yong)(yong)的智(zhi)(zhi)能(neng)創造(zao)條(tiao)件(jian)發射器(qi)(qi)，以提高石化企業生產的自(zi)動化水平。