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ABB 200900-004 DCS控制器卡件,现货供应 ,原厂发货

From: | Author:kongjiang | Time :2021-06-30 | 79 Browse: | Share:

ABB 200900-004 DCS控制器卡件,现货供应 ,原厂发货

流量丈量外表(flow measurement tester )是用来丈量管道或明沟中的液体、气体或蒸汽等流体流量的工业自动化外表,又称流量计。

流量是指单位时间内流经管道有用截面的流体数量,流体数量用体积表明者称为体积流量,单位为米3/时、升/时等;流体数量用质量表明者称为质量流量,单位为吨/时、千克/时等。

早在1738年,瑞士人丹尼尔榜首·伯努利以伯努利方程为根底,利用差压法丈量水流量;后来意大利人文丘里研讨用文丘里管丈量流量,并于1791年宣布了研讨结果;1886年,美国人赫谢尔用文丘里管制成丈量水流量的有用设备。

20世纪前期到中期,原有的丈量原理逐渐老练,大家开端探究新的丈量原理。自1910年起,美国开端研发丈量明沟中水流量的槽式流量计。1922年,帕歇尔将原文丘里水槽变革为帕歇尔水槽。

1911~1912年,美籍匈牙利人卡门提出卡门涡街的新理论;30年代,又呈现了讨论用声波丈量液体和气体的流速的办法,但到第二次世界大战停止未获很大开展,直到1955年才有使用声循环法的马克森流量计,用于丈量航空燃料的流量。1945年,科林用交变磁场成功地丈量了血液活动的状况。

二十世纪60年代今后,丈量外表开端向精细化、小型化等方向开展。例如,为了提高差压外表的精确度,呈现了力平衡差压变送器和电容式差压变送器;为使电磁流量计的传感器小型化和改进信噪比,呈现了用非均匀磁场和低频励磁方法的电磁流量计。此外,具有宽丈量规模和无活动检测部件的有用卡门涡街流量计也在70年代问世。

跟着集成电路技能的迅速开展,具有锁相环路技能的超声(波)流量计也得到了遍及使用。微型计算机的广泛使用,进一步提高了流量丈量的才能,如激光多普勒流速计使用微型计算机后,可处置较为杂乱的信号。

流量可利用各种物理现象来间接丈量,所以流量丈量外表品种繁多。按丈量办法分,流量计有差压式、变面积式、容积式、速度式和电磁式等。


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