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A pneumatically powered oxygen pressure loss alarm system for use in conjunction with a gas anesthesia machine having an oxygen supply circuit and a gas mixing circuit. The oxygen pressure loss alarm system comprises a volume chamber in which a pressurized volume of oxygen is maintained, an oxygen e

A pneumatically powered oxygen pressure loss alarm system for use in conjunction with a gas anesthesia machine having an oxygen supply circuit and a gas mixing circuit. The oxygen pressure loss alarm system comprises a volume chamber in which a pressurized volume of oxygen is maintained, an oxygen escape valve for venting the chamber when pressure within the oxygen supply circuit falls below a critical minimum level, and an audible alarm operable in response to the flow of oxygen vented from the chamber through the oxygen escape valve. In addition, a reverse flow of residual gas from the gas mixing circuit, through a master valve also used to shut off the gas anesthesia machine, is coupled to the alarm to provide an audible indication of machine shut-down.

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A pneumatically operated oxygen pressure loss alarm system for use in conjunction with a gas anesthesia machine having an oxygen supply circuit, said system comprising: a chamber in which a pressurized volume of oxygen can be maintained; a first oxygen line for connecting said chamber to a pressuriz

A pneumatically operated oxygen pressure loss alarm system for use in conjunction with a gas anesthesia machine having an oxygen supply circuit, said system comprising: a chamber in which a pressurized volume of oxygen can be maintained; a first oxygen line for connecting said chamber to a pressurized oxygen source; one-way check valve means for preventing a back-flow of oxygen from said chamber through said first oxygen line; oxygen escape valve means connected to said chamber and switchable from a closed to an open position in response to a drop in oxygen supply circuit pressure below a predetermined level; a second oxygen line for connecting said oxygen escape valve means to the oxygen supply circuit to permit said oxygen escape valve means to monitor oxygen pressure within the oxygen supply circuit; alarm means responsive to a flow of gas; a third oxygen line for connecting said oxygen escape valve means to said alarm means such that oxygen can flow from said chamber through said third oxygen line, to actuate said alarm means when said oxygen escape valve means is in an open position; and master valve means operable to disconnect the gas anesthesia machine from its oxygen supply circuit, and to simultaneously connect the alarm means in fluid communication with residual gases in the gas anesthesia machine, whereby the residual gases are vented through said alarm means to provide an indication that the anesthesia machine has been shut off.