Process and apparatus for detecting the limit level of liquids and bulk materials

摘要: In a process for the detection of limit level liquids and bulk materials in containers pipelines, change oscillation behavior sensor which is excited to detected electronically used trigger switch command. As there parallel bimorph piezoelectric element (22) having common central electrode (44) two outer electrodes (46, 48). A first alternating voltage (U1) with an oscillator frequency (f1) applied between (46), second measured as amplitude (U2) corresponding (f2) (48), or converted into output signal. device suitable carrying out process, inserted liquid-tight manner plastic cover (24), (24) its turn being fastened housing passes through wall (16) container pipeline, together extends protective tube (18) developed on (12).