描述
電流型變送器將物理量轉(zhuǎn)換成4~20mA電流輸出,必然要有外電源為其供電。最典型的是變送器需要兩根電源線,加上兩根電流輸出線,總共要接4根線,稱之為四線制變送器。當(dāng)然,電流輸出可以與電源公用一根線(公用VCC或者GND),可節(jié)省一根線,稱之為三線制變送器。
其實(shí)大家可能注意到,4-20mA電流本身就可以為變送器供電,如圖1C所示。變送器在電路中相當(dāng)于一個(gè)特殊的負(fù)載,特殊之處在于變送器的耗電電流在4~20mA之間根據(jù)傳感器輸出而變化。顯示儀表只需要串在電路中即可。這種變送器只需外接2根線,因而被稱為兩線制變送器。工業(yè)電流環(huán)標(biāo)準(zhǔn)下限為4mA,因此只要在量程范圍內(nèi),變送器至少有4mA供電。這使得兩線制傳感器的設(shè)計(jì)成為可能。
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主營(yíng):世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國(guó)AB)系列產(chǎn)品》
②Schneider(施耐德電氣)系列產(chǎn)品》
③General electric(通用電氣)系列產(chǎn)品》
④Westinghouse(美國(guó)西屋)系列產(chǎn)品》
⑤SIEMENS(西門子系列產(chǎn)品)》
⑥銷售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系統(tǒng)、WDPF系統(tǒng)、MAX1000系統(tǒng)備件。
⑧Invensys Foxboro(??怂共_):I/A Series系統(tǒng),F(xiàn)BM(現(xiàn)場(chǎng)輸入/輸出模塊)
順序控制、梯形邏輯控制、事故追憶處理、數(shù)模轉(zhuǎn)換、輸入/輸出信號(hào)處理、數(shù)
據(jù)通信及處理等。Invensys Triconex:冗余容錯(cuò)控制系統(tǒng)、基于三重模件冗余(TMR)
結(jié)構(gòu)的zui現(xiàn)代化的容錯(cuò)控制器。
⑨Siemens(西門子):Siemens MOORE,Siemens Simatic C1,Siemens數(shù)控系統(tǒng)等。
⑩Bosch Rexroth(博世力士樂(lè)):Indramat,I/O模塊,PLC控制器,驅(qū)動(dòng)模塊等。
◆Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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