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如何對壓力變送器密封性檢查

發布日期:2018-01-30 22:28

 
 
壓力變送器的外觀要求有哪些?
(l)變送器的銘牌應完整、清晰、應注明產品名稱、型號、規格、測量范圍等主要技術指標,高、低壓容室應有明顯標記,還應標明制造廠的名稱或商標、出廠編號、制造年月。
(2)變送器零部件應完整無損,緊固件不得有松動和損傷現象,可動部分應靈活可靠。
(3)新制造的變送器的外殼、零件表面涂覆層應光潔、完好、無銹蝕和霉斑,內部不得有切屑、殘渣等雜物,使用中和修理后的變送器不允許有影響使用和計量性能的缺陷。
如何對壓力(差壓)變送器進行密封性檢查?
  平穩地升壓(或疏空),使變送器測量室壓力達到測量上限值(或當地大氣壓力90%的疏空度)后,切斷壓力源,密封15min,在最后5min內通過壓力表觀察,要求其壓力值下降(或上升)不得超過測量上限值的2%。
  差壓變送器在進行密封性檢查時,高低壓力容室連通,并同時引入額定工作壓力進行觀察。
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