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SIEMENS管段式超声波流量仪表是以“速度差法”为原理,测量圆管内液体流量的仪表。它采用了良好的多脉冲技术、信号数字化处理技术及纠错技术,使流量仪表更能适应工业现场的环境,计量更方便、经济、准确。产品达到*水平,可广泛应用于石油、化工、冶金、电力、给排水等领域。
SIEMENS超声波流量计是通过检测流体流动对超声束(或超声脉冲)的作用以测量流量的仪表。
SIEMENS超声流量计和超声波流量计一样,因仪表流通通道未设置任何阻碍件,均属*流量计,是适于解决流量测量困难问题的一类流量计,特别在大口径流量测量方面有较突出的优点,它是发展迅速的一类流量计之一。
SIEMENS超声波流量计采用时差式测量原理:一个探头发射信号穿过管壁、介质、另一侧管壁后,被另一个探头接收到,同时,第二个探头同样发射信号被*个探头接收到,由于受到介质流速的影响,二者存在时间差Δt,根据推算可以得出流速V和时间差Δt之间的换算关系V=(C2/2L)×Δt,进而可以得到流量值Q、
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德国西门子SIEMENS流量计*
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SIEMENS超声波流量计换能器的压电元件常做成圆形薄片,沿厚度振动。薄片直径超过厚度的10倍,以保证振动的方向性。压电元件材料多采用锆钛酸铅。为固定压电元件,使超声波以合适的角度射入到流体中,需把元件故人声楔中,构成换能器整体(又称探头)。声楔的材料不仅要求强度高、耐老化,而且要求超声波经声楔后能量损失小即透射系数接近1。常用的声楔材料是有机玻璃,因为它透明,可以观察到声楔中压电元件的组装情况。另外,某些橡胶、塑料及胶木也可作声楔材料。
德国西门子SIEMENS流量计*