초록 ▼

A system is disclosed for detecting the leakage of fluid from a container by measuring the decay of an initial pressure input. The system employs an axially displaceable piston having a first surface exposed to fluid pressure within the container, and a second surface opposed to the first surface, h

A system is disclosed for detecting the leakage of fluid from a container by measuring the decay of an initial pressure input. The system employs an axially displaceable piston having a first surface exposed to fluid pressure within the container, and a second surface opposed to the first surface, having a first portion exposed to a reference gas pressure, and a second portion not so exposed. A gas jet has an inlet connected to a pressure sensing source and a sensing gas pressure detector with an outlet proximate to the second portion of the second surface of the piston. Changes in the relative magnitude of the fluid pressure within the container with respect to the reference gas pressure will cause the piston to alternately block and unblock the outlet of the gas jet, producing a low pressure gas signal. This device is termed the “monitor”. A pneumatic signal amplifier is connected between the gas jet and the signalling device, having a compound valve mechanism which sets a threshold below which low level noise pressure fluctuations in the sensing gas pressure will be ignored, but above which valid sensing pressures will cause an abrupt output high pressure signal to be generated. The valving action also causes an abrupt discontinuation of the signal immediately below the threshold set. This device is termed the “amplifier”. Several embodiments of the invention are described.

대표청구항 ▼

A fluid pressure monitor, comprising: an axially displaceable piston means having a first surface exposed to a fluid pressure to be monitored and a second surface opposite to said first surface, having a first portion exposed to a reference gas pressure and a second portion not so exposed; a gas jet

A fluid pressure monitor, comprising: an axially displaceable piston means having a first surface exposed to a fluid pressure to be monitored and a second surface opposite to said first surface, having a first portion exposed to a reference gas pressure and a second portion not so exposed; a gas jet having an inlet connected to a sensing gas pressure source and sensing gas pressure detector and an outlet proximate to said second portion of said second surface of said piston means: whereby changes in the relative magnitude of said fluid pressure to be monitored with respect to said reference pressure, will cause said piston means to alternately block and unblock said outlet of said gas jet, producing a pneumatic signal detectible by said detector.