Method for testing the serviceability of transducers

Details Method for testing the serviceability of transducers Method for testing the serviceability of transducers

2008-04-15

2008-04-15

Hirshfeld, Andrew H. (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C324S527000

Reexamination Certificate

active

11526422

ABSTRACT:
The invention relates to a two-wire transducer in automation engineering that outputs a measurement signal as an injected current. For the method to test the serviceability, it is proposed to increase the DC loop current (IS), independently of the measured value, from the minimum value towards the maximum value (ISM), and to measure the input voltage (UE) across the internal resistance of the transducer in the process, and to compare it with a definable threshold value (UES) that is greater than the minimum input voltage (UEM) required to maintain serviceability. If the input voltage (UE) falls below the threshold value (UES) before the DC loop current (IS) has reached its maximum value (ISM), the DC loop current (IS) is reduced until the input voltage (UE) reaches at least the definable threshold value (UES), and the error is signaled.

REFERENCES:
patent: 5347841 (1994-09-01), Enzinna
patent: 5437178 (1995-08-01), Esin et al.
patent: 6967486 (2005-11-01), Schneider
patent: 7042228 (2006-05-01), Lally et al.

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