Process control instrument intrinsic safety barrier

Details Process control instrument intrinsic safety barrier Process control instrument intrinsic safety barrier

2007-08-21

2007-08-21

Jackson, Stephen W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

High voltage dissipation

C361S113000

Reexamination Certificate

active

11243038

ABSTRACT:
A process control instrument includes a circuit board having a control circuit for generating or receiving a high frequency signal. An antenna includes an electrical conductor. An intrinsic safety circuit couples the control circuit to the antenna and comprises a microstrip transmission line on the circuit board electrically connecting the control circuit to the electrical conductor. A safety stub has a first end electrically connected to the transmission line proximate the electrical conductor and a second end connected to a ground of the control circuit.

REFERENCES:
patent: 6640084 (2003-10-01), Pande et al.
patent: 6642902 (2003-11-01), Gustafson
patent: 6906668 (2005-06-01), Rawnick et al.
patent: 6980174 (2005-12-01), Flasza et al.

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