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                                                                                                                                              液體流量標準裝置的原理及安裝注意事項

                                                                                                                                              發布時間:2018-8-24 17:05:31訪問次數:

                                                                                                                                               

                                                                                                                                              液體流量標準裝置的原理及安裝注意事項

                                                                                                                                              流量裝置是根據牛頓第二定律建立起力、加速度和質量三者關系的質量流量裝置。其原理是利用流體在振管內流動時產生的科氏力,以直接或間接的方法測量其力值大小而得到流體質量流量。流量裝置由流量傳感器和變速器組成,可以直接測量流體的質量流量和總量,有的也可以用于流體的密度測量。

                                                                                                                                              液體流量標準裝置對安裝、合理的管線以及良好的應用環境等方面都有很高的要求。如果在上述環節上做的不到位會直接影響流量裝置下一步的校準或使用,甚至無法進行校準。主要注意的方面有:

                                                                                                                                              1)原理和結構決定了外界振動對它造成影響,所以流量裝置的安裝場地要遠離大功率電機等振動干擾源;

                                                                                                                                              2)流量傳感器與實驗管道連接,要做到“無應力”;

                                                                                                                                              3)流量裝置出口處要有2m以上(視介質密度而定)的高度,必須滿足其使用的背壓要求。因為當被壓不足時,會對流量裝置的測量管振動穩定性造成一定影響。零流量時流量測量管內至少要保持0.02MPa的靜壓力;

                                                                                                                                              4)大多制造商以“量程誤差加零點不穩定度”的方式表達基本誤差,這是因為他們所制造的儀表穩定性較差,開始感覺精確度很高,但如果計入零點不穩定度,一般在±(0.01~0.04)%FS之間;此外,流量裝置的零點調整和回歸很重要,做試驗前要使流量裝置處于50%以上大流量點運行,至流場徹底穩定后,關閉流量調節閥,進行其零點的觀察與調整;

                                                                                                                                              5)防止液體流量標準裝置出口處的閥門快速切斷時所產生的“液壓撞擊”(即水錘)現象,以免損壞流量裝置。


                                                                                                                                                 

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