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超声波流量计：外夹式非接触测流
超声波流量计利用声波顺逆流时差测流速，外夹式无需断管、不接触介质，是大管径、临时与老旧管道测流的利器。
原理
时差法：顺流声波快、逆流慢，时差∝流速。
多普勒法：利用悬浮颗粒反射，适合含杂质流体。
外夹式优势
不停产安装，不破坏管道、无压损。
适用于大管径（DN50~DN6000+）。
临时检测、验收、水平衡测试首选。
限制
精度受管垢、衬里、流态影响（约 1~2 级）。
需打磨管壁、涂耦合剂、正确定位。
不适用于严重结垢或衬里不均管道。
应用
循环水、补水、蒸汽冷凝水大管径计量。
小结
超声波外夹式以"不停产、非接触"独树一帜，适合大管径与临时测流，但精度与安装质量强相关。
内容来源：综合整理自超声波流量计技术资料。
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