各種明渠流量計對比：

            明渠種類                     堰槽明渠流量計                明渠電磁流量計                          明渠時差流量計                  進(jìn)口多普勒超聲波明渠流量計

原理                                          液位測量                    液位+流速分開測量                      液位+流速分開測量                面積速度一體化測量                 


組成                                       主機(jī)+液位計+堰槽          電磁流量計+液位計+計算儀           時差多聲道流量計+液位計       計算儀+一體化傳感器
                                                                                                                            +計算儀            

安裝                                        較為簡單                      很復(fù)雜，且安裝繁瑣                      *復(fù)雜，安裝要求苛刻            很簡單，簡單固定就好
                                                             

精度                                        一般為滿量程5%           一般為滿量程2%                          示值精度0.5-1.0%                  流速的示值精度2%


價格                                          較便宜                         較昂貴                                       昂貴，周期長                       適中，周期短


測量介質(zhì)要求                             對介質(zhì)無要求               較純凈的水，不能有腐蝕性            只能測量水，不得有腐蝕性        要求不高，可以測量低腐蝕性流體


測量范圍                                液位0.5m以上，且只        液位盲區(qū)0.3m，可測較低               液位盲區(qū)0.2m，可測極低         液位盲區(qū)0.025m，可測極低流速
                                            能測量較小的渠道            流速                                            流速


適用性                                   只適用于標(biāo)準(zhǔn)堰槽，          只能測量規(guī)則的渠道                      只能測量規(guī)則渠道                   適用于管道和任何渠道
                                            應(yīng)用范圍窄