Abb Schweiz Ag

Horst Schwanzer

Joerg Gebhardt

Subhashish Dasgupta

Wilhelm Daake

Guruprasad Sosale

Tilo Merlin

Patric Ackermann

Karsten Schroeder

A method for checking an operability of two-wire measuring transducers in automation technology which output a measurement signal as an impressed loop direct current via a two-wire line and active assemblies of which are supplied with electrical energy via the two-wire line includes: measuring the loop direct current and an input voltage of the measuring transducer; increasing the loop direct current in a range from a minimum value to a maximum value independently of the measured value, while measuring the input voltage of the measuring transducer; storing the measured values of the input voltage at selected measuring points of the loop direct current as an individual signature of the measuring transducer; and, during ongoing operation, measuring the input voltage at connection terminals of the two-wire line via an internal resistance of the measuring transducer at a prevailing loop direct current and recursively comparing that with the signature.

Method for checking the operability of measuring transducers

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Langenselbold, Germany

Horst Schwanzer