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A pressure sensor assembly includes a disk entirely of metal and having a plurality of circumferentially spaced petals, separated by a plurality of radially extending slots. The slots extend from the periphery of the disk to a position near the center. However, the disks are in electrical communicat

A pressure sensor assembly includes a disk entirely of metal and having a plurality of circumferentially spaced petals, separated by a plurality of radially extending slots. The slots extend from the periphery of the disk to a position near the center. However, the disks are in electrical communication with one another. A pair of wire leads are respectively placed at terminals on two separate spaced-apart disks with the opposite end portion of the leads connected to an alarm monitor. The disk body can be used in low or high temperature applications and is corrosion resistant and preferably entirely metallic (for example, stainless steel). The disk body is designed to be installed between standard pipe flanges, between a flange and a rupture disk holder, or in a holder that is used as, or located downstream of, a rupture disk or similar device. The device is designed to cause a discontinuity (open circuit) in an electrical circuit as a result of fluid flow through the pipe. When a rupture disk or similar device bursts or a valve leaks, the resulting pressure charge will rupture (tear) the subject burst sensor creating an open circuit. The device may be of any metal with electrical conductivity compatible with an alarm system that is commercially available. The device may be domed and self-supporting. The all-metal sensor, and nonmetallic gasket provide an assembly that is more rugged, reliable, and economical than current designs and is reliable over a large range of temperatures. The apparatus of the present invention is nonfragmenting, which permits use under valves and applications where fragmentation presents a problem.

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A sensing assembly for use in an enclosed fluid flow system for providing an immediate indication of a predetermined fluid flow pressure differential across said assembly, said sensing assembly comprising: at least one infragmenting plate formed entirely of electrically conductive material; at least

A sensing assembly for use in an enclosed fluid flow system for providing an immediate indication of a predetermined fluid flow pressure differential across said assembly, said sensing assembly comprising: at least one infragmenting plate formed entirely of electrically conductive material; at least a portion of said plate enabling said plate to be mounted in said fluid flow system; first and second electrical terminals integrally formed with said plate, said first and second electrical terminals forming a closed electrical circuit path; and a weakened portion formed by cutout portion extending through the entire thickness of said plate in said closed electrical circuit path between said first and second terminals having a predetermined break strength for rupturing and opening said closed electrical circuit path if said fluid flow causes said predetermined pressure differential across said plate.