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    • 73. 发明授权
    • VORRICHTUNG ZUR BESTIMMUNG UND/ODER ÜBERWACHUNG EINER PROZESSGRÖßE EINES MEDIUMS
    • VORRICHTUNG ZUR BESTIMMUNG UND / ODERÜBERWACHUNGEINERPROZESSGRÖEEINESMEDIUMS
    • EP2041529B1
    • 2011-04-27
    • EP07765424.2
    • 2007-06-14
    • Endress+Hauser GmbH+Co. KG
    • LOPATIN, SergejMÜLLER, AlexanderD'ANGELICO, SaschaURBAN, MartinHERWIK, Stanislaw
    • G01F23/296G01N9/00
    • G01N9/002G01F23/296G01F23/2966G01F23/2967
    • The invention relates to a system for determining and/or monitoring a process quantity, in particular the density (r) of a medium (1), with an excitation/receiving unit (3) that excites a unit (2) that is capable of mechanical vibration into mechanical vibrations and that receives the mechanical vibrations. Said system also has an electronic unit (4) that drives the excitation/receiving unit (3) with an electrical excitation signal (SA), and that obtains an electrical received signal (SE) from the excitation/receiving unit (3). According to the invention, the electronic unit (4) generates the excitation signal (SA) in such a way that a phase difference (Df) is produced between the receiving signal (SE) and the excitation signal (SA) that is equal to a phase difference target value (Dfsoll), at which the effects of changes of the viscosity of the medium on the mechanical vibrations of the unit (2) that is capable of mechanical vibration are negligible, and the phase difference target value (Dfsoll) is specified depending on the ratio of the impedance of the excitation/receiving unit (3) to the input impedance of the electronic unit (4).
    • 本发明涉及一种用于利用激励单元(2)来激励/接收单元(3)来确定和/或监测处理量,尤其是介质(1)的密度(r)的系统,所述单元(2)能够 机械振动转化为机械振动并接收机械振动。 所述系统还具有利用电激励信号(SA)驱动激励/接收单元(3)并且从激励/接收单元(3)获得电接收信号(SE)的电子单元(4)。 根据本发明,电子单元(4)产生激励信号(SA),使得在接收信号(SE)与激励信号(SA)之间产生相位差(Df),该相位差等于 相位差目标值(Dfsoll),其中介质的粘度变化对能够机械振动的单元(2)的机械振动的影响可忽略,并且指定相位差目标值(Dfsoll) 取决于激励/接收单元(3)的阻抗与电子单元(4)的输入阻抗的比率。