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                                                                                                                                              電磁流量計等級和功能

                                                                                                                                              發布時間:2016-12-8 16:33:45訪問次數:
                                                                                                                                              電磁流量計的精度等級和功能
                                                                                                                                                    有些電磁流量計精度高、功能多, 市場上通用型EMF性能有較大差別。有些則精度低、功能簡單。精度高的儀表基本誤差為(±0.5%±1%R)精度低的儀表則為(±1.5%±2.5%FS)。因此丈量精度要求不很高的場所選用高精度儀表在經濟上是不合算的基本誤差僅(±0.2%±0.3%R),但有嚴格的裝置要求和參比條件,有些型號儀表聲稱有更高的精確度。例如直管段長度要求分別大于10D和3D通常為5D和2D甚至提出流量傳感器要與前后直管組成一體在流量規范裝置上作實流校準,以減少夾裝影響。因此在多種型號選擇比擬時不要單純只看高指標,要詳細閱讀制造廠樣本或說明書做綜合分析。

                                                                                                                                                簡單的電磁流量計就只是丈量單向流量,市場上EMF功能差異也很大。只輸出模擬信號帶動后位儀表;多功能儀表有測雙向流、量程切換、上下限流量報警、空管和電源切斷報警、小信號切除、流量顯示和總量計算、自動核對和故障自診斷、與上位機通信和運動組態等。



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