Patent ID: 6067022
Filing Date: 2000-05-23
Classification: A62B

Abstract:
An in-line low supply pressure alarm device, powered solely by supply flow of pressurised gas from a regulated gas supply, for providing an alarm signal when supply gas pressure is below a selected minimum pressure, the device comprising:a manifold having: input port means for communicating with the supply gas supply; output port means for conducting the gas downstream; and a manifold chamber disposed therebetween;gas powered alarm means, connected to the manifold chamber via an alarm supply conduit, for producing an alarm signal when pressurised gas passes to the alarm means;supply gas pressure sensor means, in communication with the manifold chamber, for producing an actuating flow of pressurised gas, in response to sensing of a supply gas pressure below a selected minimum pressure;pneumatic alarm output switch means, in the alarm supply conduit and in communication with the sensor means via an actuation conduit, for controlling gas flow to the alarm means in response to the actuating flow; andalarm oscillation means for alternating the direction of the actuating flow to and from the alarm output switch means, the alarm oscillation means comprising: a vent conduit communicating between the actuation conduit and a downstream portion of the alarm supply conduit, said downstream portion being defined between the alarm means and the alarm output switch means.