Trouble detecting circuit for resistive sensor type indicator

Details Trouble detecting circuit for resistive sensor type indicator Trouble detecting circuit for resistive sensor type indicator

1987-07-31

1989-09-19

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

204401, 324425, 324537, G01K 3102

Patent

active

048685089

ABSTRACT:
In a resistive-sensor type indicator having a resistive sensor whose resistance changes according to a quantity to be measured and an indicator for indicating a sensor output voltage developed across the resistive sensor, when the resistive sensor is open due to disconnection or malconnection of the resistive sensor, the indicator indicates a maximum reading, thus resulting in a problem such that the user cannot recognize the abnormal state. To overcome this problem, a novel trouble detecting circuit is additionally incorporated in the indicator. The circuit comprises a comparator for outputting an abnormal signal when the sensor voltage exceeds a reference voltage and a transistor for grounding the resistive sensor in response to the abnormal signal. Therefore, the indicator indicates a minimum reading in case of resistive sensor trouble.

REFERENCES:
patent: 4166243 (1979-08-01), West et al.
patent: 4167163 (1979-11-01), Moder
patent: 4203142 (1980-05-01), Lee
patent: 4224606 (1980-09-01), Bartles
patent: 4267505 (1981-05-01), Biglin
patent: 4525850 (1985-06-01), Miller
patent: 4622844 (1986-11-01), Bienkowski

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