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液位计

单管式或双管式液位计

发布日期:2022-10-09 点击率:90

  单管式或双管式液位计

  单管式或双管式液位计液体密度计的研制成功,促进了液位计技术的发展.化学工业中为了防止静电危害,过去曾采用浮子式液位计来控制液位,由于它不够安全而逐渐被淘汰.一近年来,单管式、双管式液位计以其安全可靠、精确度高而被广泛使用.其原理与振动管密度计相似,装置如图4所示,它由振动管及装于管内的二个压电陶瓷片组成,一根直管插入待测液位的液体中,由于受到压电陶瓷片的电磁驱动,管子将弯曲振动,见图4(a),管子的振动又使与其接触的液体产生位移,所以浸入液体的管段部分与未浸入液体的管段相比有较大的惯量.这样浸没部分香段振动波的传播速度较小些,所以振动波由一端传到另一端的时间依赖于管子所插人的深度,管子作受迫振动的共振频率是插入深度的函数.当此函数关系确定后,只要测出谐振频率,便可得出液位高度.从图5可见,单管式液位计测量液位高度时,其谐振频率与液位高度存在近似的线性关系.图形中一些周期性小弯曲,是由于当液面接近于振动波的波节时,弯曲振动的振幅较小,此点液位有所变化,而弓}起共振频率的变化不太显著所造成.为了克服这一缺点,英国科学家Langdon又将单管式液位计改进为双管式,将两个管径相同的管子分别由两个独立的扫频振荡器所驱动,并把两个管子的长度设计成这样,使得振动时,一管的波节位置恰好为另一管的波腹位置;即相差1/4波长.因此二次测量仪表对两管共振频率探测的综合结果使得f一h曲线成为一条平滑曲线.当然实际使用中也可在同一根管中分别装置二对电磁驱动器和电磁敏感元件,并分别输入二组独立的且相位差约为1/4波长的振动信一号,使得探测的最终效果为谐振频率f和液位高度h成线性关系.这种液位计已用于飞机油箱中液位的检测,由于它的高精度和可靠性,并易于同微机系统相结合,所以对化工液体罐、油料罐等液位的监测具有特别的吸弓}力.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" alt="" width="200" height="239">单管式或双管式液位计

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