Source: http://www.google.ca/patents/US8787848
Timestamp: 2017-11-24 17:02:14
Document Index: 262941887

Matched Legal Cases: ['Application No. 200980122611', 'Application No. 200980122611', 'Application No. 200680035248', 'Application No. 2', 'Application No. 06774208', 'application No. 08837236', 'Application No. 09767061', 'Application No. 09767062', 'Application No. 10752246', 'Application No. 2006145434', 'Application No. 2011', 'application No. 2006145434', 'application No. 201009226', 'application No. 201009226', 'Application No. 2010092278', 'application No. 2010092278', 'Application No. 05724190', 'Application No. 05724190', 'application No. 4676', 'Application No. 2011', 'application No. 200780018710', 'application No. 2005248759', 'Application No. 2005800142124', 'application No. 200980122613', 'Application No. 20008', 'application No. 2011514603', 'application No. 2012527988', 'application No. 2006134646', 'application No. 2007', 'Application No. 200980122835', 'application No. 2008116682', 'application No. 201009093', 'Application No. 2011', 'application No. 2006145434', 'Application No. 200580006438', 'Application No. 200580006438', 'Application No. 2005800142124', 'Application No. 200880110323', 'application No. 200980122835', 'Application No. 05746241', 'Application No. 05853808', 'application No. 07837769', 'application No. 2011101386', 'Application No. 2011101386', 'application No. 2012527994', 'application No. 2011101364', 'Application No. 2', 'application No. 2011101386', 'application No. 2563337', 'Application No. 2726608', 'Application No. 2726613', 'application No. 2009139488', 'application No. 2009139488', 'application No. 2726608', 'application No. 2726613', 'application No. 05746241', 'application No. 2007527282', 'application No. 2007527282', 'application No. 4676', 'Application No. 2', 'Application No. 200980122835', 'Application No. 200680035248', 'application No. 2005248759', 'application No. 200980122611', 'application No. 200980122613', 'application No. 2006145434', 'application No. 2008116682', 'application No. 05746241', 'application No. 200580014212', 'application No. 05746241', 'Application No. 05746241', 'Application No. 2006', 'Application No. 2005800142124', 'application No. 2005800014212', 'Application No. 200580014212', 'application No. 200680015575', 'application No. 200580006438', 'application No. 201009226', 'Application No. 2010092245', 'Application No. 2010092278', 'application No. 2010092245', 'application No. 2010092278', 'Application No. 201009093']

Patent US8787848 - RF adapter for field device with low voltage intrinsic safety clamping - Google Patents
An adapter for coupling to a process control transmitter of the type used to monitor a process variable in an industrial process includes a first connection configured to couple to a first side of a two wire process control loop, a second connection configured to couple to a second side of the two wire...http://www.google.ca/patents/US8787848?utm_source=gb-gplus-sharePatent US8787848 - RF adapter for field device with low voltage intrinsic safety clamping
Publication number US8787848 B2
Application number US 12/486,269
Also published as CA2726707A1, CA2726707C, CN102084307A, CN102084307B, EP2294488A2, US20090253388, WO2009154748A2, WO2009154748A3
Publication number 12486269, 486269, US 8787848 B2, US 8787848B2, US-B2-8787848, US8787848 B2, US8787848B2
Inventors John A. Kielb, Brian L. Westfield, Kelly M. Orth
Patent Citations (436), Non-Patent Citations (183), Referenced by (3), Classifications (22), Legal Events (1)
US 8787848 B2
a first adapter connection configured to couple to a first wire of a two wire process control loop;
a second adapter connection configured to couple to a first transmitter connection of a process control transmitter;
a third adapter connection configured to couple to a second transmitter connection of the process control transmitter and to a second wire of the process control loop, wherein the third adapter connection is used to communicate information on the two wire process control loop;
wireless communication circuitry configured to provide wireless communication for the process control transmitter, wherein the first and second adapter connections are used to power the wireless communication circuitry; and
intrinsic safety circuitry coupled to at least one of the first, second and third adapter connections configured to limit energy transfer to a value which is less than an intrinsic safety value, wherein the two wire loop is used for powering the process control transmitter and powering the wireless communication circuitry, and the two wire process control loop is further configured to ca information communicated from the third adapter connection.
4. The apparatus of claim 2 wherein the diode is connected between the first and second adapter connections.
5. The apparatus of claim 2 wherein the diode is connected between the second and third adapter connections.
6. The apparatus of claim 2 wherein the diode is connected between the first and third adapter connections.
7. The apparatus of claim 1 wherein the intrinsic safety circuitry is coupled between the first, second and third adapter connections.
13. The apparatus of claim 1 including a fuse coupled in series with at least one of the first, second and third adapter connections.
14. The apparatus of claim 8 wherein the intrinsic safety circuitry is coupled in series between the capacitor and the at least one of the first, second and third adapter connections.
18. The apparatus of claim 1 including communication circuitry configured to communicate with the process control transmitter.
19. A method of coupling a wireless adapter to a process control transmitter of the type used to monitor a process variable in an industrial process, the method comprising:
coupling a first adapter connection to a first wire of a two wire process control loop;
coupling a second adapter connection to a first transmitter connection of a process control transmitter;
coupling a third adapter connection to a second transmitter connection of the process control transmitter;
powering wireless communication circuitry with power received from the two wire process control loop through the first and second adapter connections;
communicating information on the two wire process control loop using the third adapter connection; and
limiting energy transfer through at least one of the first, second and third adaptive connections to a value which is less than an intrinsic safety value, wherein the two wire loop is used for powering the process control transmitter and powering the wireless communication circuitry, and the two wire process control loop is further configured to carry information communicated from the third adapter connection.
20. The method of claim 19 wherein limiting energy transfer comprising limiting energy going into circuitry of the adapter.
21. The method of claim 19 wherein limiting energy transfer comprising limiting energy coming out of circuitry in the adapter.
22. The method of claim 19 including storing energy in a capacitor.
23. The method of claim 22 wherein the capacitor comprises a super capacitor.
24. The method of claim 19 wherein the step of limiting uses active circuitry.
25. The method of claim 20 including limiting storage of electrical energy in the adapter to a value which is less than the value of the intrinsic safety value.
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U.S. Classification 455/117, 455/127.1, 455/67.11, 710/106, 710/12, 700/12, 455/115.1, 700/19, 700/79, 710/72, 710/16
Cooperative Classification Y02P90/86, Y02P80/114, G08C17/02, G05B2219/34313, G01D21/00, G05B2219/33192, G05B2219/31121, G05B19/4185, Y02P90/18