过程分析

换热器破裂检测

换热器用于冷却液体过程介质，以及/或者回收排出的热量用于其他过程。典型的应用领域包括：发电厂的蒸汽发生器或冷却塔（空气冷却介质），以及使用板管式换热器通过液体冷却介质以更高效率进行冷却的过程区域。

冷却水中的电导率变化表明存在过程破裂情况

在换热器中不同温度的物质流通过分离但透热的、通常为金属的腔壁或管壁进行温度交换。磨损和腐蚀可能会导致间壁或管道产生泄漏，从而污染冷却介质并对设备造成严重损害。此外，如果受污染的冷却水进入当地的供水系统，则存在危害健康的风险，而且工厂运营商将受到高额处罚。

冷却下来的蒸汽会凝结成冷凝水，冷凝水的纯度很高，因此电导率很低。由于电导率升高表明有污染，因此测量冷凝水的电导率是检查设备功能是否正常或是否出现过程破裂的可靠方法。

为此使用的测量回路通常采用各种不同的电导率传感器，这些传感器与开关柜中的多个工业变送器相连。但是这种配置需要大量布线，并且占用开关柜中的大量安装空间。

数字传感器技术 Memosens 可提供一种节省空间且免维护的解决方案：使用 Memosens 电导率传感器 SE615 可以在 10 µS/cm – 20 mS 的宽范围内确定冷凝水的污染情况。这款传感器非常细长，带有 PG 13.5 连接螺纹，在温度不高的换热器下游使用合适的连接件（例如 ARI106）就可以很方便地将其在线与过程适配。

对于更高的压力和温度要求，建议使用传感器 SE604（适用于最小测量范围 0.001 – 1000 µS/cm）或者 SE630（适用于高达 50 mS/cm 的较高测量范围），二者均可通过 G 1" 或者 NPT 螺纹实现直接过程连接。

所有传感器都有内置的温度探头，用于正确补偿温度。将测量回路连接到控制系统时，导轨安装式纤巧型 (12 mm) MemoRail 变送器可以显著减少开关柜内的空间需求和布线工作量。此外，两个标准信号电流输出端可确保将过程测量值和温度无电势传输给 PLC。

投资回报

可靠监测冷却水质量，确保设备效率，并降低维修费用和耗水量。
通过精确的电导率测量，可以及时发现泄漏，并在造成代价高昂的设备和环境损害之前予以排除。
使用 MemoRail 变送器将测量值和温度值传输给控制系统，可以腾出开关柜内的空间，大幅减少布线工作量。

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8月 2022

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使用配备 EtherNet/IP 协议的 Stratos Multi E471 进行过程优化

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5月 2021

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New toroidal Digital Conductivity Sensor with a large measuring range and consisting of PFA for using in aggressive media

3月 2021

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7月 2020

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7月 2020

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Fitting, ARD50, ARD75

导电版模块化浸入式连接件

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4月 2020

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2月 2018

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4月 2017

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2月 2017

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High-Precision Conductivity Measurement at Extreme Temperature Differences

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换热器破裂检测

换热器破裂检测

冷却水中的电导率变化表明存在过程破裂情况

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