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                                                                                                                        • 分析天平
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                                                                                                                        首頁 > 新聞中心 > 分析天平稱量之前進行預熱是非常重要的
                                                                                                                        分析天平稱量之前進行預熱是非常重要的
                                                                                                                        發布日期:2022-07-08      瀏覽次數:374
                                                                                                                          分析天平是采用電磁力平衡的原理。稱盤與通電線圈相連接,置于磁場中,當被稱物置于稱盤后,因重力向下,線圈上就會產生一個電磁力,與重力大小相等方向相反。傳感器輸出電信號。由此產生的電信號通過模擬系統后,將被稱物品的質量顯示出來。
                                                                                                                         
                                                                                                                          稱量之前要進行預熱,這既是電子天平的使用方法,也是其特征之一。只有經過了預熱之后,磁鋼才會據此實現平衡,天平也才會平衡。在預熱的時候主要的是需要控制天平的預熱時間,而預熱時間的確定需要與天平的檢定分度值以及分度數相結合。才能綜合得出,當然預熱時間也會由于各生產廠商的天平性能的不同而略有差別。不過,一般而言天平在檢定之前需要預熱半個小時以上的時間,需要注意的是天平的預熱時間同精度也存在密切的聯系。精度越高的天平,它的預熱時間會越長,所以一定要按照電子天平的使用說明書進行操作,達到預熱時間之后才能夠進行檢定。
                                                                                                                         
                                                                                                                          分析天平稱量時注意事項:
                                                                                                                          稱量容器:
                                                                                                                          1、盡可能選用開口較小的稱量容器;
                                                                                                                          2、避免使用塑料或玻璃等容易產生靜電的容器
                                                                                                                          3、保持稱量容器和樣品的溫度一致性,避免溫度差異產生氣流;
                                                                                                                          4、用鑷子加載樣品,不要直接用手將稱量容器放置到防風罩內。
                                                                                                                          秤盤:
                                                                                                                          1、樣品或稱量容器應盡可能放置于秤盤中心;
                                                                                                                          2、微量/半微量天平在使用前,應當進行砝碼的多次加載卸載運動天平;
                                                                                                                          3、稱量完畢后,應當從秤盤上取下樣品。
                                                                                                                          運動天平:為了使處于休眠狀態的天平逐步進入工作狀態,可用相當于天平稱量的砝碼或物體在秤盤上反復加載和卸載10次或更多次,不在意天平的顯示值和是否回零。
                                                                                                                          稱量:避免過度超載,否則會損壞天平內部元件,降低天平的使用壽命。

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