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                                                                                                                        • 分析天平
                                                                                                                        • 超聲波體重秤
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                                                                                                                        首頁 > 新聞中心 > 遇到分析天平的“軟故障”不要怕 教您應對!
                                                                                                                        遇到分析天平的“軟故障”不要怕 教您應對!
                                                                                                                        發布日期:2022-11-10      瀏覽次數:137
                                                                                                                           分析天平是定量分析中不可缺的重要儀器之一,它是根據杠桿原理設計而成的一種稱量用的精密儀器。其計量性能包括靈敏性、穩定性、準確性和示值變動性。該天平準確說是比電子臺秤在稱重數據上更準的稱量儀器,在市場上所可以購買到的分析天平種類有手動式、自動式、半自動式、全自動式、機械式。機械式天平的工作原理是當天平達到平衡時,物體的質量就等于砝碼的質量;但是電子分析天平是采用電磁平衡方法,所以在秤重量時需要校準才能確定正確的數據。
                                                                                                                          分析天平在使用過程中會出現一些“軟故障”,其中幾個較為典型的如下:
                                                                                                                          1.違反操作程序
                                                                                                                          分析天平每年要進行周期檢定,在周檢結束時,企業質量管理部門或化驗人員要求現場驗收確認,這時經常有人隨手取下身上攜帶的物品試稱,如項鏈、鑰匙等。殊不知,這些帶體溫的物件與天平內的溫度不一致,造成天平的平衡位置零位不準而誤認為是天平產生了變動。這時計量檢定人員需耐心的講解,被稱物的溫度必須與室溫一致后方可放入天平內稱量??梢匀』炇覂冉涍^恒溫的其它樣品試稱,避免因溫度不同影響了天平的平衡,以確保天平計量性能的可靠。
                                                                                                                          2.干燥劑失效
                                                                                                                          操作人員在稱量時,樣品經烘干冷卻后在天平上稱量,取下樣品時發現天平有變動,再次稱樣后仍有變動。待檢定人員到達現場檢查發現,天平內的干燥劑已潮濕,干燥劑全失去了作用,烘干的樣品吸收了稱盤上的水分,使天平失去了平衡而產生了變動。要求立即更換無腐蝕性的干燥劑,告知當干燥劑變色時應及時取出烘烤,其水分被烤干后,可繼續使用。待天平穩定后重新稱樣,問題便到了解決。
                                                                                                                          3.天平失衡
                                                                                                                          天平看上去是平衡的,但實際不水平且容易被忽視,使阻尼器的內外筒周邊縫隙不均勻,造成天平開啟后內外筒相互摩擦,影響稱量數據的準確,嚴重的還會造成天平無法使用。提醒操作人員在稱量前,注意察看天平是否處于水平狀態,或規定專人負責,如果氣泡不居中,應及時調整天平底部的調整角,待天平水平后即可稱量。
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