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關于投入式液位計經濟型技改方法探討

熱度0票  瀏覽3次 時間:2019年7月05日 10:44
  摘 要:投入式液位計是基于所測液體靜壓與該液體高度成正比的原理,采用擴散硅或陶瓷敏感元件的壓阻效應,將靜壓轉成電信號。投入式液位計的傳感器部分可直接投入到液體中,變送器部分可用法蘭或支架固定,安裝使用極為方便。但是在水質硬度高的場合其使用周期會大大縮短維護量也會大大提高,給生產維護帶來很大的不便。
  關鍵詞:液位計;變送器
  投入式液位計使用廣泛,在生活、化工、電力、建筑等都有使用,其安裝使用維護方便,但在硬水質中維護量大,希望這篇文章能給同行帶來啟發。
  一、概述
  1.投入式液位計工作原理
  投入式液位計是基于所測液體靜壓與該液體高度成正比的原理,采用擴散硅或陶瓷敏感元件的壓阻效應,將靜壓轉成電信號。經過溫度補償和線性校正。轉換成4-20mADC標準電流信號輸出。投入式液位計的傳感器部分可直接投入到液體中,變送器部分可用法蘭或支架固定,安裝使用極為方便。
  2.投入式液位計特點
  穩定性好,精度高; 直接投入到被測介質中,安裝使用相當方便; 固態結構,無可動部件,高可靠性,使用壽命長從水、油到粘度較大的糊狀都可以進行高精度測量,不受被測介質起泡、沉積、電氣特性的影響 。
  3.安裝方式
  投入式液位計傳感器頭部有不銹鋼帽保護,安裝前要取下才能進行安裝,并且要事先預埋一根鋼管在水里作為投入式液位計的保護套管,套管上開孔。安裝如圖所示。
  4.維護方法
  維護為定期(一月)維護,本廠有12支投入式液位計(1)清洗時先打開投入式液位計鐵管的旋帽,小心拿出液位計;再將液位計上附著的雜物(比如水草,浮游生物等)清除掉。
  (2)清潔水位計引壓孔時,可使用三氯乙烯或酒精注入引壓孔到其高度二分之一處浸泡5分鐘左右,然后輕微晃動、重復多次,直到清洗干凈位止。禁止使用任何器具清洗引壓孔,以免損壞敏感芯子感壓膜片。
  (3)清潔變送器壓力接口和引壓孔時,忌用硬度過大的刷子或金屬工具,以避免損傷敏感芯子及壓力接口螺紋。
  (4)清洗完畢后將投入式液位計慢慢的放回鐵管中,感覺已放置鐵管的低部,將旋帽安裝回原處即可。在卸下清洗后重新安裝,因安裝深度會有一定的變動,必須再次比照水閘同一水位當時的水位表尺,對二次儀表的檢測值進行矯正,以確保采樣數據的正確性。
  二、技改原因
  1.這樣的安裝方法使得事前和事后維護工作量都大,而且傳感器膜盒極易損壞,后采用在不銹鋼螺帽前部鉆小孔的方法解決了這個問題,使得安裝方法化簡為直接投入水中即可,維護方法簡化為直接取出擰開螺帽清理即可。
  2.由于本廠水質硬度大,雜質多,經常性的出現傳感器膜盒表面出現無法清理的硬垢致使液位計無法使用或者測量出現誤差,最終導致更換投入式液位計的現象。
  因此逐步改變維護周期從一月到3周到2周最后到1周使得維護量增大4倍。頻繁維護使得工作量增大,人員忙不過來的現象時有發生。
  三、技改過程
  為了能在投入式液位計使用周期不改變的前提下降低維護工作量,進行了一定的實驗。
  1.用PVC膠帶封住螺帽上的孔,但是造成測量嚴重偏差。
  2.換成薄塑料袋套住傳感器并用自粘帶封住塑料袋口,投入水中效果良好,使用一個月后(期間無維護),出現液位偏差甚至不變的現象,取出發現傳感器膜盒上已經開始結垢。至此維護量又變回原來的一月維護一次。
  順著這個思想,我們又更改成厚塑料袋進行試驗,一年之內只有3只投入式液位計出現結垢現象,大大的縮短了維護周期,同時提高了投入式液位計的使用周期。
  但是用厚塑料袋同時會帶來一個液位響應速度慢的現象,后結合上次實驗,在重要水箱水位上使用薄塑料袋,一月維護一次,在不重要的或者變化不大的水位上使用厚塑料袋,基本不用維護,解決了投入式液位計使用周期短的情況。
  總結
  這種經濟型的技改,不僅增加了投入式液位計的使用周期,也降低了維護量,最重要的是節省了大量人員和材料上的成本。
  參考文獻:
  [1] 張毅 張寶芬 曹麗 彭黎輝。自動化檢測技術及儀表控制系統【M】化學工業出版社.



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