Patent ID: 8746059
Filing Date: 2014-06-10
Classification: G01F

Abstract:
1. An apparatus for determining and/or monitoring at least one process variable of a medium, comprising: at least one probe unit, said probe unit includes a probe electrode and a guard electrode; at least one electronics unit, which supplies said probe unit with an operating signal and which receives from said probe unit a received signal; and at least one insulating unit, which insulates said guard electrode and probe electrode electrically from one another, wherein: said guard electrode surrounds said probe electrode, at least in sections, coaxially; said probe electrode has a greater length than said guard electrode: said probe unit ends with said probe electrode: said guard electrode surrounds said probe electrode only at the beginning of said probe unit; said probe electrode and said guard electrode are completely surrounded, by said insulating unit; and said insulating unit has, in the region of said electrode, a smaller thickness than in the region of said probe electrode.