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eja变送器在选型时要考虑它的介质对膜盒金属的腐蚀，被测介质的温度如果高一般为较高，达到200°C”~400C，要选用高温型，否则硅油会产生汽化膨胀，使测量不准。在选型时要考虑设备工作压力等级，变送器的压力等级必须与应用场合相符合。从经济角度上讲，外膜盒及插入部分材质比较合适，但连接法兰可以选用碳钢、镀铬。这样可以降低成本。对于普通压力和差压变送器选型，也要考虑被测介质的腐蚀性问题，但使用的介质温度可以不考虑，因为普通型压变是引压到表内，长期工作温度为常温，但普通型使用的维护量要比隔离型大。首先是保温问题，在北方冬季零下，导压管会结冰，变送器无法工作甚至损坏，这就需要增加伴热和保温箱等。变送器都具有一定的量程可调范围，使用的量程范围设在它量程的1/4 *3/4段，精度会有保证。http://www.wuhandekema.com/武汉德科蒙过程控制有限公司027-88062221传真：027-88068180。ABSolute;top:0;border:0;width:undefinedpx;height:undefinedpx;" frameborder="0" src="https://googleads.g.doubleclick.net/pagead/ads?guci=2.2.0.0.2.2.0.0&client=ca-pub-6745515041074118&ouTPUt=html&adk=1812271804&adf=3279755396&plat=1%3A32776%2C2%3A32776%2C8%3A134217728%2C9%3A134250504%2C10%3A32%2C11%3A32%2C16%3A8388608%2C17%3A32%2C24%3A32%2C25%3A32%2C30%3A1081344%2C32%3A32%2C40%3A32&format=0x0&url=https%3A%2F%2Fwww.bizrobot.com%2Fcompany_bloginfo.php%3Fact%3D1&ea=0&flash=28.0.0&pra=5&wgl=1&tt_state=W3siaXNzdWVyT3JpZ2luIjoiaHR0cHM6Ly9hZHNlcnZpY2UuZ29vZ2xlLmNvbSISInN0YXRlIjowfSx7Imlzc3Vlck9yaWdpbiI6Imh0dHBzOi8vYXR0ZXN0YXRpb24uYW5kcm9pZC5jb20iLCJzdGF0ZSI6MH1d&dt=1609831450865&bpp=14&bdt=47&idt=136&shv=r20201203&cbv=r20190131&ptt=9&saldr=aa&cookie=ID%3Df208fc56032ec04a-222ab57211c400ce%3AT%3D1602655468%3ART%3D1602655468%3AS%3DALNI_MZ90KP_NdNDKAtfzA4A4RaK0MMehQ&nras=1&correlator=2287713945564&frm=23&ife=1&pv=2&ga_vid=1783416114.1609831451&ga_sid=1609831451&ga_hid=1205524007&ga_fc=0&nhd=1&u_tz=480&u_his=6&u_java=0&u_h=1080&u_w=1920&u_ah=1030&u_aw=1920&u_cd=24&u_nplug=11&u_nmime=26&adx=-12245933&ady=-12245933&biw=1257&bih=828&isw=730&ish=360&ifk=2699508910&scr_x=0&scr_y=0&eid=21067214%2C21066922&oid=3&pvsid=750220513450268&pem=596&ref=https%3A%2F%2Fwww.bizrobot.com%2Fcompany_bloginfo.php%3Fadd_suc%3D1&rx=0&eae=2&fc=1920&brdim=759%2C139%2C759%2C139%2C1920%2C0%2C1278%2C828%2C730%2C360&vis=1&rsz=%7C%7Cs%7C&abl=NS&fu=8204&bc=29&ifi=0&uci=0.f1nrrylhobyg&dtd=156" marginwidth="0" marginheight="0" vspace="0" hspace="0" allowtransparency="true" scrolling="no" allowfullscreen="true" data-google-container-id="0.f1nrrylhobyg" data-load-complete="true"> |