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安徽天康溫度儀表常見故障檢查

發布時間:2021-08-18      點擊次數:560
  安徽天康溫度儀表的工作原理是利用二種不同溫度膨脹系數的金屬,為提高測溫靈敏度,通常將金屬片制成螺旋卷形狀,當多層金屬片的溫度改變時,各層金屬膨脹或收縮量不等,使得螺旋卷卷起或松開。由于螺旋卷的一端固定而另一端和一可以自由轉動的指針相連,因此,當雙金屬片感受到溫度變化時,指針即可在一圓形分度標尺上指示出溫度來。
 
  安徽天康溫度儀表常見故障分析:
 
  1、先檢查溫度儀表系統的指示值,如果其指示值變化到最大或者變化到最小,可以判定是儀表系統故障,其原因是溫度儀表系統測量一般具有較大的滯后性,突然變化不會發生。溫控儀表的故障一是在熱電偶、熱電阻以及補償導線斷線上,二是其變送器放大器出現失靈而導致故障。
 
  2、檢查溫度控制儀表系統指示值是否是大幅緩慢的波動,這種現象一般是是工藝操作變化造成的,如果沒有工藝操作變化狀態存在,可以判定為儀表控制系統自身出現了故障。
 
  3、判定溫度控制系統身的故障后,先對儀表的調節閥輸入信號進行檢查,看是否有變化,如果輸入信號沒有變化,而調節閥已經動作,可以判定是調節閥膜頭膜片發生泄漏故障;檢查調節閥定位器輸入信號,如果輸入信號沒有發生變化,而輸出信號在變化,則判定是儀表的定位器出現了故障;檢查儀表定位器的輸入信號與儀表的調節器輸出信號,如果調節器輸入信號沒有變化,輸出信號在變化,可以判定是儀表的調節器自身出了故障。
 
  4、檢查溫度控制儀表系統指示值是不是不停的快速振蕩,這種現象一般是可是控制參數PID調整不當導致的故障。
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