Conductivity sensor with switching between transmitting and receiving coil

US8581575B2 · kind B2 · utility

Assignee

• Endress+Hauser Conducta Gesellschaft fuer Mess- und Regeltechnik mbH + Co. KG · DE

Inventors

• Andreas Eberheim · Hartha, DE
• Thomas O. Nagel · Rockford, US
• Andre Thieme · Borna, DE
• Hendrik Zeun · Chemnitz, DE

Key dates

• Filing date: Jun 15, 2010
• Grant date: Nov 12, 2013
• Expiry date: May 26, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/74
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An inductively working sensor for determining the conductivity of a liquid medium. The sensor includes: at least one transmitting circuit, which is designed to deliver an input signal for a transmitting coil, in order to produce in the transmitting coil an alternating electromagnetic field, which causes a ring-shaped electrical current in the liquid medium; at least one receiving circuit, which is designed to evaluate a received signal produced by the ring-shaped electrical current in a receiving coil; a first coil; a second coil, which is arranged at a distance from the first coil; a switching means for switching between a first switch state and a second switch state, wherein, in the first switch state, the first coil, serving as transmitting coil, is coupled with one of the transmitting circuits; and the second coil, serving as receiving coil, is coupled with one of the receiving circuits, and wherein, in the second switch state, the second coil, serving as transmitting coil, is coupled with one of the transmitting circuits, and the first coil, serving as receiving coil, is coupled with one of the receiving circuits.