[精品]电磁流量计选型指南及材料的选择.doc

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1、电磁流量计选型指南及材料的选择选型指南被测流体必须是导电性的液体或浆液，其电导率不小于5us/cm,被测流体不应含较多的铁磁性物质或气泡，应根据被测流体的特性选择合适的压力等级、衬里材料、电极材料及仪表结构形式。通径的选择1、因GS-LD电磁流量计具备1500：1高最程比，通常选择仪表口径与工艺管道口径相同°2、若被测介质含固体颗粒，推荐的流速范围为1-3m/s,如实际流速过大，又不便更改的，可选仪表通径大于工艺管道通径，以适当减小流量计的测量管段的流体流速，减轻颗粒对电极和衬里的磨损。3、若工艺管道中可能有沉积物，推荐的流速为2—5m/s,如实际流速过小，又不便更

2、改工艺管道的，可选仪表通径小于工艺管道通径,以适当增大流量计流体流速，避免沉积物对仪表蒂确度的影响。4、在流速太小呦又要求高榕度计戢的，可选小于工艺管道通径的传感器，使流速变大，保证较高榕确度。上述2、3、4项情况,流量计上、下游须装异径管。异径管屮心锥角应不大于150,且异径管上游至少有5倍工艺管道直径的直管段。为帮助选瑕，下表列出了几个具有代表性流速对应的流最。任何流最对应流速也可快捷地利用木表算出：若已知流最值Q(n?/h),再山表屮査出相应通径下1m/s流速对应流戢值Q1,则对应流速V=Q/Qi(m/s)流速一流量对照表（通径mm疣量m3/h流速m/s）0.

3、01（最小）1234515（杲大）15O.CO640.63621.27231.90852.54473.13399.5426200.01131.13102.26193.39294.52395.654916.9646250.01771.76713.53435.30147.06868.835726.5072400.04524.52399.047813.571718.095622.619567.8584500.07077.068614.137221.205828.274335.3429106.0288650.119511.945923.891835.837747.78365

4、9.7295179.1886800.181018.095636.191154.286772.382390.4779271.43361000.282728.274356.548784.8230113.0973141.3717424.11501500.636263.6173127.2345190.8518254.4690318.0863954.25882001.1310113.0973226.1947339.2920452.3893565.48671696.46002501.7671176.7146363.4292530.1438706.8583883.57292650

5、.71883002.5447254.4690508.9333763.40701017.87601272.34503817.03513503.4636346.3606692.72121039.081813E5.44241731.90305195.40894004.5239452.3893904.77871357.16801909.55742261.94676785.84014505.7256572.55531145.11051717.66582290.22102862.77638588.32895007.0686706.85831413.71672120.575028

6、27.43343534.291710602.875260010.17881017.87602035.75203053.62814071.50415089.380115268.140370013.85441385.44242770.88474156.32715541.76946927.211820781.635480018.09561939.55743619.11475428.6721723&22959047.786827143.36C590022.90222290.22104580.44216870.66319160.884211451.1C5234353.3157

7、10CO28.27432827.43345654.86688482.300211309.733614137.166942411.500812CO40.71504071.50418143.008212214.512216286.016320357.520461072.561214CO55.41775541.769411083.538916625.338322167.077827708.847283126.541616CO72.38237238.229514476.458921714.688428952917936191.1474108573.4421180091.