专利名称：Device for determining and/or monitoring of
a predefined liquid level in a container
发明人：GETMAN, IGOR, PROF.,LOPATIN, SERGEJ, DR.申请号：EP97107152.7申请日：19970430公开号：EP0875739A1公开日：19981104
专利附图：
摘要：The device uses a mechanical oscillator into the container and a piezoelectricelement with three zones (I,II,III) with a transmission electrode (21) and 2 receptionelectrodes (22,23). The reception electrodes have the same shape and are symmetrical
with respect to one another. They have opposing polarisation of the piezoelectricelement for the 2 reception electrode zones (II,III), and the reception signal is due to thedifference between the signals provided by the reception electrodes.
申请人：ENDRESS + HAUSER GMBH + CO.
地址：Hauptstrasse 1 79689 Maulburg DE
国籍：DE
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