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超聲波明渠流量計 我有新說法
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　　超聲波明渠流量計與量水堰槽配合使用，測量明渠內水的流量。主要用于測量污水廠、企事業單位的污水排放口、城市下水道的流量及農田水利中的渠道等。

　　由于本公司儀表采用超聲波穿過空氣，以非接觸的方法測量。因此在粘污、腐蝕性液體條件下，比接觸式的儀表，具有更高的可靠性和耐用性。

　　一、用途

　　超聲波明渠流量計與量水堰槽配合使用，測量明渠內水的流量。主要用于測量污水廠、企事業單位的污水排放口、城市下水道的流量及農田水利中的渠道等。

　　由于本公司儀表采用超聲波穿過空氣，以非接觸的方法測量。因此在粘污、腐蝕性液體條件下，比接觸式的儀表，具有更高的可靠性和耐用性。

　　超聲波測水位原理

　　發射超聲換能器發射出的超聲脈沖，通過傳播媒質傳播到被測液面，經反射后再通過傳聲媒質返回到接收換能器，測出超聲脈沖從發射到接收在傳聲媒質中傳播的時間。再根據傳聲媒質中的聲速，就可以算得從換能器到液面的距離。從而確定液位。因此我們可以計算出探頭到反射面的距離D=C*t/2（除以2是因為聲波從發射到接收實際是一個來回，D是距離，C是聲速，t是時間）。再通過減法運算就可得出液位值。

　　量水堰槽的測流量原理

　　流通順暢的明渠內流量越大，液位越高;流量越小，液位越低（如下圖）。通過測量水位可以推算出流量。普通明渠內流量與水位之間的對應關系，受渠道的坡降比和表面的糙度影響。在渠道內安裝量水堰槽，產生節流作用，使明渠內的流量與液位有固定的對應關系，這種對應關系主要取決于量水堰槽的構造尺寸，把渠道的影響盡可能減小。

　　測量范圍:0.1升/秒～99999.99米/小時，根據不同的堰槽來確定。

　　累計流量大為：4290000000.00立方米

　　液位大量程:1米，2米，5米,10米四種，更大范圍，需要定做。

　　液位測量精度:0.5%

　　分辨率:3mm或0.1%（取大者）

　　顯示:中文液晶顯示

　　流量測量精度:符合國標要求的巴歇爾槽、三角堰是1～5%。

　　符合國標要求的矩形堰是10%

　　非標堰槽是10～50%。

參考資料

參考資料編輯區域


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