Low input pressure alarm for gas input
First Claim
1. 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; and
alarm 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.
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Accused Products
Abstract
The invention provides an in-line low supply pressure alarm device powered solely by supply flow of pressurized gas from a gas supply for providing an alarm signal when supply gas pressure is below a selected minimum pressure. The alarm device includes a manifold having an input port for communicating with the supply gas supply, an output port for conducting the gas downstream and a manifold chamber disposed therebetween. Gas powered alarms such as an audible reed alarm or a visual pneumatic alarm are connected to the manifold chamber via an alarm supply conduit, and produce an alarm signal when pressurized gas passes to the alarms. An supply gas pressure sensor, in communication with the manifold chamber, produces an actuating flow of pressurized gas by activating a pressure switch, in response to sensing of an supply gas pressure below the selected minimum pressure. A pneumatic alarm output switch, in the alarm supply conduit and in communication with the pressure sensor and pressure switch via an actuation conduit, controls gas flow to the alarms in response to the actuating flow. Preferably, an alarm oscillation system is included for alternating the direction of the actuating flow to and from the alarm output switch, to open and close the alarm output switch thereby turning the alarm on and off in a cyclical fashion.
43 Citations
5 Claims
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1. 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:
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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; and alarm 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. - View Dependent Claims (2, 3, 4, 5)
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Specification
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- Resources
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Current AssigneeO-Two Systems International Incorporated
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Original AssigneeO-Two Systems International Incorporated
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InventorsLaswick, Ronald A, Bowden, Kevin D. J.
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Primary Examiner(s)Wu, Daniel J.
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Application NumberUS09/066,769Time in Patent Office757 DaysField of Search340/626, 340/632, 128/204.18, 128/204.25, 128/205.24US Class Current340/626CPC Class CodesA62B 9/006 Indicators or warning devic...
