Electronic proximity switching device

Details Electronic proximity switching device Electronic proximity switching device

2004-09-30

2008-10-21

Sherry, Michael J (Department: 2836)

Electrical transmission or interconnection systems

Personnel safety or limit control features

C307S116000

Reexamination Certificate

active

07439638

ABSTRACT:
An electronic switching device, which operates without contact, includes a single sensor element (1), a clock generator, which can be provided internally or which can be connected externally, an evaluation circuit (2), and an electronic or electromechanical switch (3), which is provided on an output side. The evaluation circuit (2) includes diversity processing units (4, 5), and a checking unit (6), wherein an output signal of the sensor element (1) is delivered in succession to the processing units (4, 5), and that output signals of the processing units (4, 5) are checked for consistency by the monitoring unit (6). Advantageously, with only a single sensor element (1), category 4 of EN 954-1 or safety level SIL 3 of EN 61508 requirements can be achieved.

REFERENCES:
patent: 3898472 (1975-08-01), Long
patent: 4917199 (1990-04-01), Loshbough
patent: 7132766 (2006-11-01), Gasperi et al.
DIN EN 954-1, Mar., 1997, pp. 1-21.
BIA-Report Jun. 1997.

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