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Common problems and solutions for liquid level measurement of magnetic flap level gauge

磁翻板液位计,也有人称为磁性液位计,是利用连通器原理和磁性耦合原理进行工作的。由于其弥补了玻璃管液位计不能在高温高压环境中使用的不足,能够在更广泛的领域使用。但在液位测量中,磁翻板液位计常会出现一些问题,使液位测量不能正常进行。下面磁翻板液位计厂家将为您介绍磁翻板液位计液位测量常见问题及应对介绍如下。

一、磁翻板液位计测量常见问题

一般地,磁翻板液位计液位测量的常见问题有显示不正常,浮子卡阻等。导致这些问题的因素很多,但较为常见的原因主要有两点:一是浮子脏污,二是介质较粘稠和结晶。

  1. 磁翻板液位计显示不正常
    在使用磁翻板液位计的过程中常会出现显示不准、液位跳变性变化或者画直线等现象。出现该问题一般是浮子脏污导致。
    具体说来,就是由于浮子本身含有长久性磁铁,而介质中含有或多或少的杂质,介质在长期不流动状态下,杂质会被磁性浮子吸附在表面,并随着使用时间的延长越聚越多,很容易造成浮子质量增加甚至产生沉没失去检测作用。
  2. 浮子出现卡阻现象
    附着在浮子上的脏污杂质虽不会导致浮子沉没,但随着其附着在浮子表面的增多,也会导致浮子在浮筒中的上下活动受限,出现卡阻或者卡死的现象。

如果浮筒内壁也附着杂质,会进一步阻碍浮子的上下浮动,引起液位变化出现跳变或者卡死不动的现象。另外,介质本身正常情况下粘度较大,很容易造成浮子动作缓慢。而一些介质在常温情况下结晶,也易造成浮子出现上述现象。

二、磁翻板液位计常见问题对策

针对以上常见问题,通常做法是拆卸磁翻板液位计下方的法兰,取出浮子进行人工清洗去污。由于去污工作很脏且有危险,在清洗前一定要注意事先做好防护。这是因为,在拆卸清洗浮子的过程中,人体易因硫酸、硝酸等各种腐蚀性介质的腐蚀而受伤,或者因有毒气体的挥发对人体产生危害。

为降低劳动强度,减少腐蚀性液体对对人体的腐蚀,对于浮子清洗除采取人工拆卸清洗的方法外,还可对磁翻板液位计进行改造,以实现免拆卸。

具体方法就是通过对浮筒上部的丝堵进行改造,安装一个冲洗管线,就可以使用蒸汽和自来水进行切换。当出现浮子卡阻的问题时,只要把磁翻板液位计的侧面或上下连接设备阀关闭,打开排污阀,然后开启上部的冲洗阀,轮番使用蒸汽和自来水冲洗,即可除去磁浮子上吸附的脏污杂质,也能够除去测量筒内壁的杂质。对于磁翻板液位计的排污阀应进行定期更换,因针型阀易出现堵塞现象,可更换使用寿命较长,且操作更为方便的闸板阀。

对于浮子由于介质黏稠和结晶造成的卡阻或者卡死现象,我们建议采取加伴热管,或加伴热带,再就是选带夹套的磁翻板液位计。通过蒸汽伴热使介质的黏度降低,同时也可适度解决介质的结晶问题。

利用连通器原理工作的磁翻板液位计,其浮筒中的介质处于设备外部,当所测介质是易冷凝或者在零度以下易结冰的介质时,就要考虑保温和伴热。但需要注意的是,在保温时一定不要使用易导磁的铁丝对保温材料进行固定,以使面板显示和远传磁敏元件免受磁化影响。另外,也要控制好蒸汽伴热的流量,防止温度过高造成磁性减弱。

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