Abstract: A non-reclosing, over-pressure relief device comprising a unitary pressure support having a central dome including a convex surface and an opposed concave surface, a flange surrounding the dome, the flange including a transition portion joining the flange to the dome and an elliptically shaped blow-out portion included in the dome formed by at least one cut-through line of an elliptical shape. In a preferred embodiment, the blow-out portion has at least one connecting member connectably bridging the cut-through line to connect the blow-out portion to an adjacent portion of the dome to thereby retain the blow-out portion, and at least one pressure seal in juxtaposition with the device.

Abstract: A fluid flow monitor has coaxial conductive annular supports separated by an insulating gasket and connected by a conductive member. One support has a lesser external diameter and a smaller internal diameter than the other to reduce the chance of accidental short circuiting. Wires are attached to each support, a third wire supplies a floating ground to ensure monitor tripping is not caused by a ground fault. Tabs on the inner perimeter of the supports may mount the conductive member.

Abstract: A fluid flow monitor has coaxial conductive annular supports separated by an insulating gasket and connected by a conductive member. One support has a lesser external diameter and a smaller internal diameter than the other to reduce the chance of accidental short circuiting. Wires are attached to each support, a third wire supplies a floating ground to ensure monitor tripping is not caused by a ground fault. Tabs on the inner perimeter of the supports may mount the conductive member.