G - Physics – 01 – L
Patent
G - Physics
01
L
G01L 7/08 (2006.01) G01L 9/00 (2006.01) G01L 19/06 (2006.01)
Patent
CA 2059644
ABSTRACT OF THE DISCLOSURE A transmitter (10) that provides an output indicating pressure difference between a line pressure and atmosphere outside the transmitter (10) is made intrinsically safe by coupling the sensor cavity (44) as well as other cavities (12, 13) where ignition can occur to atmosphere only through flame quenching paths. The opening (22) in the transmitter housing (10) in which the sensor (45) is mounted has a plug (41) including the sensor cavity (44) that holds the sensor (45), and a fitting (26) which is couplable to the pressure line. An isolator (35) is used for transmitted the process pressure to the sensor (45) through an isolator diaphragm (35A) acting on an incompressible filling the sensor cavity (44) and transmitting pressure through a passageway (35B) that is shaped to provide a flame quenching path. The passageway (35B) flame isolates the sensor (45) from the process fluid line. The opposite side of the sensor (45) is connected to atmosphere only through paths (50, 51, 52) which are flame quenching because of the passageway shape. The plug (35) is an assembly that can be made easily inserted and removed, and provides intrinsic safety even if there is failure of some of the components such as the isolating diaphragm (35A) or welds holding portions of the plug (35) together.
Mattison Lee Ann
Peterson Thomas P.
Walish James E.
Marks & Clerk
Rosemount Inc.
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