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二线制本特利变送器连接的导线只有两根，这两根导线同时传输供电电源和输出信号，如图所示。可见，电源、变送器和负载电阻是串联的。二线制变送器相当于一个可变电阻，其阻值由被测参数控制。当被测参数改变时，变送器的等效电阻随之变化，因此流过负载的电流也变化。本特利变送器的正常工作电流，必须等于或小于信号电流的Z小值，由于电源线和信号线公用，电源供给变送器的功率是通过信号电流提供的。在变送器输出电流为下限值时，应保证它内部的半导体器件仍能正常工作。因此，信号电流的下限值不能过低。因为在变送器输出电流的下限值时，半导体器件必须有正常的静态工作点，需要由电源供给正常工作的功率，因此信号电流必须有活零点。http://www.benteli.cn/电话：027-87263542手机：18372021864LED">ABSolute;top:0;border:0;width:undefinedpx;height:undefinedpx;" SANdbox="allow-forms allow-popUPS allow-popups-to-escape-sandbox allow-same-origin allow-scripts allow-top-navigation-by-user-activation" frameborder="0" marginwidth="0" marginheight="0" vspace="0" hspace="0" allowtransparency="true" scrolling="no" allowfullscreen="true" src="https://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-6745515041074118&ouTPUt=html&adk=1812271804&adf=3279755396&plat=3%3A32%2C4%3A32%2C9%3A32776%2C16%3A8388608%2C17%3A32%2C24%3A32%2C25%3A32%2C30%3A1081344%2C32%3A32&format=0x0&url=https%3A%2F%2Fwww.bizrobot.com%2Fcompany_bloginfo.php%3Fact%3D1&ea=0&flash=29.0.0&pra=5&wgl=1&dt=1643015309286&bpp=3&bdt=54&idt=40&shv=r20220119&mjsv=m202201120101&ptt=9&saldr=aa&cookie=ID%3D2c186cce80d69fb1-221c8408a0ce006c%3AT%3D1636508022%3ART%3D1636508022%3AS%3DALNI_Mbu0HZjDtEO7dny0NgdC9Kvxw3uwg&nras=1&correlator=1335345105885&frm=23&ife=1&pv=2&ga_vid=455411637.1643015309&ga_sid=1643015309&ga_hid=1781904066&ga_fc=0&nhd=1&u_tz=480&u_his=6&u_h=1080&u_w=1920&u_ah=1030&u_aw=1920&u_cd=24&u_sd=1&DMC=4&adx=-12245933&ady=-12245933&biw=1508&bih=893&isw=730&ish=360&ifk=2699508910&scr_x=0&scr_y=0&eid=44750773%2C31064037%2C31064203&oid=2&pvsid=1054652774003052&pem=217&tmod=2027344190&nvt=1&ref=https%3A%2F%2Fwww.bizrobot.com%2Fcompany_bloginfo.php%3Fadd_suc%3D1&eae=2&fc=1664&brdim=693%2C45%2C693%2C45%2C1920%2C0%2C1556%2C1030%2C730%2C360&vis=1&rsz=%7C%7Cs%7C&abl=NS&fu=32772&bc=31&ifi=1&uci=1.xagu4w4t9rwj&fsb=1&dtd=56" data-google-container-id="1.xagu4w4t9rwj" data-load-complete="true"> |