公开(公告)号：WO1991004475A1

公开(公告)日：1991-04-04

申请号：PCT/US1990004280

申请日：1990-07-31

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  WALISH, James, E. ,  MATTISON, Lee, Ann ,  PETERSON, Thomas, P.

IPC: G01L07/08

CPC classification number: G01L19/0038 ,  G01L19/0084 ,  G01L19/0645 ,  G01L19/0663 ,  G01L19/143

Abstract: 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 transmitting 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.

公开(公告)号：EP0493397B1

公开(公告)日：1994-12-21

申请号：EP90912186.5

申请日：1990-07-31

Applicant: ROSEMOUNT INC.

Inventor： WALISH, James, E. ,  MATTISON, Lee, Ann ,  PETERSON, Thomas, P.

IPC: G01L7/08 ,  G01L9/06

CPC classification number: G01L19/0038 ,  G01L19/0084 ,  G01L19/0645 ,  G01L19/0663 ,  G01L19/143

Abstract: 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 transmitting 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.

公开(公告)号：EP0493397B2

公开(公告)日：2004-06-16

申请号：EP90912186.5

申请日：1990-07-31

Applicant: ROSEMOUNT INC.

Inventor： WALISH, James, E. ,  MATTISON, Lee, Ann ,  PETERSON, Thomas, P.

IPC: G01L7/08 ,  G01L9/06

CPC classification number: G01L19/0038 ,  G01L19/0084 ,  G01L19/0645 ,  G01L19/0663 ,  G01L19/143

Abstract: 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 transmitting 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.

公开(公告)号：EP0493397A1

公开(公告)日：1992-07-08

申请号：EP90912186.0

申请日：1990-07-31

Applicant: ROSEMOUNT INC.

Inventor： WALISH, James, E. ,  MATTISON, Lee, Ann ,  PETERSON, Thomas, P.

IPC: G01L7 ,  G01L9 ,  G01L19

CPC classification number: G01L19/0038 ,  G01L19/0084 ,  G01L19/0645 ,  G01L19/0663 ,  G01L19/143

Abstract: On ôte tout danger à un transmetteur (10) donnant une donnée de sortie de la différence de pression entre une pression de ligne et l'atmosphère se trouvant à l'extérieur du transmetteur (10) en couplant la cavité du détecteur (44) ainsi que les autres cavités (12, 13) où le feu peut se déclarer vers l'atmosphère, uniquement à des voies de passage étouffant les flammes. L'ouverture (22) située dans le boîtier du transmetteur (10) dans lequel le détecteur (45) est monté, possède une prise (41) incluant la cavité du détecteur (44) qui maintient le détecteur (45) et un assemblage (26) que l'on peut coupler à la ligne de pression. On utilise un sectionneur (35) pour transmettre la pression du processus au détecteur (45) par un diaphragme du sectionneur (35A) s'exerçant sur un remplissage incompressible de la cavité du détecteur (44) et transmettant la pression par un passage (35B) ayant une forme servant à étouffer les flammes lors de leur passage. Le passage (35B) isole des flammes le détecteur (45) de la ligne liquide du processus. Le côté opposé du détecteur (45) n'est relié à l'atmosphère que par des passages (50, 51, 52) qui étouffent les flammes en raison de la forme de ceux-ci. La prise (35) est un assemblage qu'on peut facilement introduire et retirer, et qui offre une grande surêté même s'il se produit une défaillance d'un des composants comme le diaphragme d'isolation (35A) ou le soudage des parties de support de la prise (35).