Patent · US Active

Field device for process instrumentation

US8593214B2 · kind B2 · utility

1Cited by

4References

6Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Reinhard Bachmann · Lingenfeld, DE
Eric Chemisky · Haar, DE
Michael Geppert · Bingen, DE
Simon Rohrbach · Greenville, US
Ralf Walter · Zeitlarn, DE

Key dates

Filing date	Jul 5, 2010
Grant date	Nov 26, 2013
Priority date	—
Expiry date	Aug 11, 2030

Classification

Technology area (CPC G)Physics
CPC primaryG05B2219/25428
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A field device for process instrumentation having an interface for connecting a two-wire cable and for outputting measurement values, wherein the interface comprises a series circuit having a transistor circuit by which the loop current is adjustable as a function of a control signal, a power supply, and a device by which the loop current can be captured as an actual value that is fed by a first feedback coupling to a regulator having integrated behavior. The regulator compares the actual value to a target value, and generates a control signal for the transistor circuit. The actual value is fed by a second feedback coupling to a summation point as a compensation signal for generating an input signal for the transistor circuit as a function of the control signal and the compensation signal to suppress interference coupled into the two-conductor line.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.