140CPU11303
140CPU11303
140CPU11303 ◆中海德(福建)工业设备有限公司 ◆联系人:陈小真 ◆电话:0591- 83566917 ◆手机:18005006971 ◆qq:2851617312 ◆传真:0591-83489960 ◆公司地址:福建省福州市高新区乌龙江大道正荣财富中心B座八层 量程比的影响 差压变送器的量程比是指在满足精度要求的情况下变送器所能测量的最大值与最小值的比。一般情况下,量程比越大,其测量精度就越低 , 压力变送器量程比大,有很多好处,这样一台仪表调校后,可以用在多个不同的场合。但是实际中量程比调的太高,会带来很多测量稳定性的问题。 大多数差压变送器在10:1的量程比范围内,精度仍为参考精度,不受量程比的影响。但仍有相当数量的差压变送器保证参考精度的量程比小于10:1,这一指标甚至还3:1和2:1;且同一型号产品的不同量程代号,保证参考精度的量程比也可能出现很大的差别,这都是用户在计算受量程比影响后的精度时需特别注意的。 温度的影响 差压变送器在过程应用中,过程温度、环境温度会发生很大的变化,肯定会与变送器测试时的参考条件不同,这也意味着性能将与所介绍的参考精度不同。温度对差压变送器的影响在接近最大量程(即小量程比)时很小,但在接近最小量程(即大量程比)时影响就很大,有时甚至超出了我们的想象。根据一些产品手册提供温度对零点精度和量程精度的综合影响公式中,如果输入最大量程比为100,则可以得到接近10%的影响。 一些现代智能压力变送器产品,增加了内部温度传感器,用于修正环境温度变化引起的热影响。 静压的影响 类似于温度和量程的影响,静压对变送器的零点和量程的精度也有实质性影响。如电容式差压变送器,这种变送器在生产工艺系统运行过程中,几乎都会受到静压的影响,当运行工况的静压超过一定值时,其静压影响的误差将超过变送器本身的精度,对测量通道进行通道精度计算时,如果加入静压影响误差,则可能无法满足通道精度要求,因此电容式差压变送器校验时必须对静压影响进行修正。 安装倾斜角度对变送器的影响 安装倾斜角度是指变送器在安装到现场之后,变送器中轴线与铅垂线之间的夹角。 差压测量时,检测元件是通过检测中心测量膜片的形变位移来感知两边压力差的。由于中心测量室内充满了灌充硅油,当差压变送器沿着垂直于测量膜片平面方向倾斜时,灌充硅油本身对测量膜片会产生压力,引起膜片形变,导致输出值的变动。而当差压变送器沿着与测量膜片平面平行的方向倾斜的时,灌充硅油就不会压迫测量膜片,因此无影响。不同量程的变送器受倾斜影响的程度不同,量程越小,影响越大;当差压变送器前倾和后倾时,其输出线性和输出值变化不明显,不会影响其正常使用;当差压变送器左倾或右倾时,其输出值将根据倾斜角度发生单方向的漂移,角度越大,影响越大,但线性不会有明显变化。 测量点与安装点高度差的影响 由于工业现场总体设计的需要,差压变送器往往不能安装在使用现场的测量点附近,而是通过引压管引压到一个比较集中的地方,以便于维护和管理,这就会造成测量点与安装点之间存在高度差,引压管中的传压介质就会因高度差产生附加压力,从而产生影响,引人附加误差。流程工业应用中,由于介质的密度往往较大,因此即使是较小的高度差,引入的附加误差也是较大的。 IME08-1B5PSZUDKS31 IME12-04BPSZC0SS32 IME08-1B5PSZWDKS34 IME08-1B5PSZWDKS32 IME08-1B5PSZWDKS33 IME12-08NPSZC0SS33 IME12-04BNSZW2SS34 IME12-04BNSZC0KS35 IME08-02BPSZW3KP02 IME30-15BPPZC0S IME18-12NPSZC0KF45 IME08-1B5PSZUDKS36 IME12-04BPPZW5K IME18-12NPSVW2S IME12-04BPSVC0K IME12-04BPSZUDKS37 IME08-02BNSZW2SS37 IME08-02BDOZT0S IME08-02BDSZT0S IME08-04NDSZT0S IME12-04BDSZC0S IME12-08NDSZC0S IME18-12NDSZC0S IME30-15BDSZC0S IME30-20NDSZC0S IME08-04NDOZT0S IME12-04BDOZC0S IME12-08NDOZC0S IME18-08BDOZC0S IME18-08BDSZC0S IME18-12NDOZC0S IME30-15BDOZC0S IME30-20NDOZC0S IME08-02BNSZUDKS39 IME08-1B5NSZUDKS40 IME18-08BPPZWDSS21 IME12-04BPSZC0KS41 IME08-02BDOZY2S IME08-02BDSZY2S IME08-04NDOZY2S IME08-04NDSZY2S IME12-04BDOZY2S IME12-04BDSZY2S IME12-08NDOZY2S IME12-08NDSZY2S IME18-08BDOZY2S IME18-08BDSZY2S IME18-12NDOZY2S IME18-12NDSZY2S IME30-15BDOZY2S IME30-15BDSZY2S IME30-20NDOZY2S IME30-20NDSZY2S IME12-02BNSZW5S IME12-04NNSZW5S IME12-04BDSZQ9S IME18-08BDSZQ9S IME18-08NPSZT0S IME18-08BPSZC0KS22 IME12-02BDSZY2S IME08-02BDSZY2K IME18-05BNSZW5S IME12-04BDSZY2K IME18-08BDSZY2K IME30-15BDSZY2K IME08-02BNSZU3K IME30-10BPPZUDSS27 IME30-15BPPZUDSS28 IME30-15NPSZQ9K IME12-04BPOZT0K IME08-04BPSZW2S IME12-04BNSZWDKS50 IME18-08BNSZWDSS26 IME30-15NPSZW2SS29 IQ40-40NPPKC0K IQ40-20BPPKC0K IQ40-20BNPKC0K IQ40-20BPSKC0K IQ40-20BPSKK0S IQ40-20BPOKC0K IQ40-20BPOKK0S IQ40-20BNSKC0K IQ40-20BNSKK0S IQ40-20BNOKC0K IQ40-20BNOKK0S IQ40-40NPSKC0K IQ40-40NPSKK0S IQ40-40NPOKC0K IQ40-40NPOKK0S IQ40-40NNSKC0K IQ40-40NNSKK0S IQ40-40NNOKC0K IQ40-40NNOKK0S IQ40-20BPSKC0S IQ40-40NPSKC0S IQ40-20BPPKK0S IQ40-20BNPKK0S IQ40-20BPPKC0S IQ40-40NPPKK0S IQ40-40NNPKC0K IQ40-40NNPKK0S IQ40-40NPPKC0S IQ40-30NPP-KC1 IQ40-20BPP-KC1 IQ40-35NPP-KCM IQ40-15BPP-KK1 IQ40-20NPP-KK1 IQ40-15BAP-KK1 IQ40-15BDP-KK1 IQ40-20BPSKC0K IQ40-40NPSKC0K IQ40-20BPPKC0K IQ40-40NPPKC0K IQ40-35NPPKC0K IQ40-15BPP-KK0 IQ40-20NPP-KK0 IQ40-15BUP-KK0 IQ40-20NUP-KK0 IQE17-05NPSKW2S IQE17-05NPOKW2S IQE17-05NNSKW2S IQE17-05NNOKW2S IH04-0B8PS-VW1 IH04-0B8PS-VT1 IH03-0B6PS-VU1 IH03-0B6NS-VU1 IH03-0B6PO-VU1 IH04-0B8NS-VW1 IH04-0B8NS-VT1 IH03-0B6PS-VUB IH03-0B6PS-VR1 IH04-0B8PS-VR1 IH04-0B8PS-VUD IH03-01BNSVU2K IH03-01BPSVU2K IH03-01BNSVR8K IH03-01BPSVR8K IH06-02BPS-VP1 IH06-02BPO-VT1 IH06-1B5PS-VWK IH06-1B5NS-VWK IH06-1B5PO-VWK IH06-1B5PS-VTK IH06-1B5NS-VTK IH06-1B5PO-VTK IH06-02BPS-VTQ IH06-02BPS-VWK IH06-02BNS-VWK IH06-02BPS-VTK IH06-02BNS-VTK IH06-02BPO-VTK IH06-04NPS-VWK IH06-04NNS-VWK IH06-04NPS-VTK IH06-04NNS-VTK IH06-04NPO-VTK IH06-1B5PS-VWXS01 IH06-02BPS-VW1 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IQ40-20BPSKC0K IQ40-20BPSKK0S IQ40-20BPOKC0K IQ40-20BPOKK0S IQ40-20BNSKC0K IQ40-20BNSKK0S IQ40-20BNOKC0K IQ40-20BNOKK0S IQ40-40NPSKC0K IQ40-40NPSKK0S IQ40-40NPOKC0K IQ40-40NPOKK0S IQ40-40NNSKC0K IQ40-40NNSKK0S IQ40-40NNOKC0K IQ40-40NNOKK0S IQ40-20BPSKC0S IQ40-40NPSKC0S IQ40-20BPPKK0S IQ40-20BNPKK0S IQ40-20BPPKC0S IQ40-40NPPKK0S IQ40-40NNPKC0K IQ40-40NNPKK0S IQ40-40NPPKC0S IQ40-30NPP-KC1 IQ40-20BPP-KC1 IQ40-35NPP-KCM IQ40-15BPP-KK1 IQ40-20NPP-KK1 IQ40-15BAP-KK1 IQ40-15BDP-KK1 IQ40-20BPSKC0K IQ40-40NPSKC0K IQ40-20BPPKC0K IQ40-40NPPKC0K IQ40-35NPPKC0K IQ40-15BPP-KK0 IQ40-20NPP-KK0 IQ40-15BUP-KK0 IQ40-20NUP-KK0 IQE17-05NPSKW2S IQE17-05NPOKW2S IQE17-05NNSKW2S IQE17-05NNOKW2S IH04-0B8PS-VW1 IH04-0B8PS-VT1 IH03-0B6PS-VU1 IH03-0B6NS-VU1 IH03-0B6PO-VU1 IH04-0B8NS-VW1 IH04-0B8NS-VT1 IH03-0B6PS-VUB IH03-0B6PS-VR1 IH04-0B8PS-VR1 IH04-0B8PS-VUD IH03-01BNSVU2K IH03-01BPSVU2K IH03-01BNSVR8K IH03-01BPSVR8K IH06-02BPS-VP1 IH06-02BPO-VT1 IH06-1B5PS-VWK IH06-1B5NS-VWK IH06-1B5PO-VWK IH06-1B5PS-VTK 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