Process control instrument intrinsic safety barrier
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United States of America Patent
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-
Aug 21, 2007
Grant Date -
Jan 26, 2006
app pub date -
Oct 4, 2005
filing date -
Sep 30, 2002
priority date (Note) -
In Force
status (Latency Note)
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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.
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