Measuring and testing – Fluid pressure gauge – With protective separator
Patent
1989-09-20
1990-11-20
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
With protective separator
73723, 73756, G01L 900
Patent
active
049708988
ABSTRACT:
A transmitter that provides an output indicating pressure difference between a line pressure and atmosphere outside the transmitter is made intrinsically safe by coupling the sensor cavity as well as other cavities where ignition can occur to atmosphere only through flame quenching paths. The opening in the transmitter housing in which the sensor is mounted has a plug including a sensor cavity that holds the sensor, and a fitting which is couplable to the pressure line. An isolator is used for transmitting the process pressure to the sensor through an isolator diaphragm acting on an incompressible filling the sensor cavity and transmitting pressure through a hole that is shaped to provide a flame quenching path. The passageway flame isolates the sensor from the process fluid line. The opposite side of the sensor is connected to atmosphere only through paths which are flame quenching because of the passageway shape. The plug 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 or welds holding portions of the plug together.
REFERENCES:
patent: 3793885 (1974-02-01), Frick
patent: 4068206 (1978-01-01), Popp
patent: 4227418 (1980-10-01), Bonner et al.
patent: 4370890 (1983-02-01), Frick
patent: 4563903 (1986-01-01), Kohnlechner
patent: 4576049 (1986-03-01), Kohnlechner
patent: 4586018 (1986-04-01), Bettman
patent: 4809555 (1989-03-01), Kunz
Intrinsic Safety by R. J. Redding (1979), p. 154.
Electrical Instruments in Hazardous Locations, Second Edition by Ernest C. Magison--1972, pp. 23-27 and pp. 125-132.
Mattison Lee A.
Peterson Thomas P.
Walish James E.
Rosemount Inc.
Woodiel Donald O.
LandOfFree
Pressure transmitter with flame isolating plug does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pressure transmitter with flame isolating plug, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pressure transmitter with flame isolating plug will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-447105