normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 揭阳卡箍连接食品流量计 hlzld电磁流量计变送器的量程可以根据两条原则来选择:一是仪表满量程大于预计的大流值,二是正常流址大于仪表满量程的50%,以保证一定的测量精度。
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 衬里选择
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 电磁流量计内衬材料正确选用方法
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 应根据被测介质的腐蚀,磨损和温度来选择内衬材料:
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 一、天然橡胶(软橡胶)
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 1、较好的弹,耐磨和扯断力
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 2、耐一般的弱酸、弱碱的腐蚀
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 3、 测水、污水
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 二、耐酸橡胶(硬橡胶)
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 可耐常温下的、醋酸、草酸、氨水、磷酸及50%的、氢氧化钠、氢的腐蚀,但不耐强氧化剂的腐蚀
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 测一般的酸、碱、盐溶液
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 三、氯丁橡胶(Neoprene)
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 1、极好的弹,高度的扯断力,耐磨能好
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 2、耐一般低浓度的酸碱、盐溶液的腐蚀,但不耐氧化介质的腐
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> <80℃;
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 测水、污水、泥浆和矿浆
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 四、聚胺脂橡胶(Polyurethane)
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 1、极好的耐磨能
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 2、耐酸、碱能差
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> <40℃
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 测中强磨损的煤浆、泥浆和矿浆
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 五、聚四氟乙烯(PTFE)
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 1、耐沸腾的、、硝酸、王水、浓碱和各种有机溶剂
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 2、耐磨能好,粘接能差
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> -80~+180℃;
normal align=left style=tt-align:left;tt-indent:24.0pt;background:white;> 测浓度、浓碱强腐蚀溶液及卫生类介质