Patent ID: 7513151
Filing Date: 2009-04-07
Classification: G01F

Abstract:
1. An apparatus for measuring and/or monitoring a physical or chemical process variable of a medium, comprising: an oscillatable unit; a driver/receiver unit, which has at least one signal input and one signal output, and which excites said oscillatable unit to oscillate, and/or which receives its oscillations; a control/evaluation unit, which has at least one signal input and one signal output, which controls said driver/receiver unit, and/or which evaluates the oscillations of said oscillatable unit; at least one transmitting line and one receiving line between said control/evaluation unit and said driver/receiver unit; and at least a third line, wherein: said one transmitting line is connected with said one signal output of said control/evaluation unit and said at least one signal input of said driver/receiver unit, said one receiving line is connected with said one signal output of said driver/receiver unit and said at least one signal input of said control/evaluation unit; and said transmitting line and said receiving line, are connected with said control/evaluation unit and with said driver/receiving unit via plug connectors; said third line is embodied and arranged in a manner such that it is located in the region of said plug connectors between said one transmitting line and said one receiving line, and is connected with a voltage source, which has an output impedance which is smaller than the impedance of a condensate bridge in said region of said plug connectors between said one transmitting line and said one receiving line; and the voltage source, with which said third line is connected, is an electronics unit with low output impedance, which is embodied in a manner such that said third line lies at the same potential as said one receiving line.