Abstract: An underwater camera unit and a surface controller for controlling the underwater camera unit via an underwater cable. The camera unit includes a pressure housing containing a modem, a command processor coupled to the modem to receive control signals from the modem, an image processor coupled to the modem, to provide image data to the modem, and a camera sensor coupled to the image processor. The camera unit also includes a connector for connecting the underwater camera unit to the underwater cable. The modem is coupled to the connector. The modem is operable to multiplex image data from the image processor with control and/or monitoring signals from the command processor and transmit the multiplexed image data and control and/or monitoring signals from the underwater camera unit via the connector. The modem is also operable to receive control and/or monitoring signals via the connector and pass them to the command processor.

Abstract: An aspect provides a ventilation manifold for a ventilator, the manifold comprising a fluid flow path, the flow path comprising: bifurcated end paths, a constriction path and a compressed breathable gas chamber fluidly coupled to a compressed breathable gas source, the manifold having a manifold axis defined by the constriction path; a source path of the bifurcated ends coupled to an outlet conduit for a ventilator to present the compressed breathable gas at a source angle to one side of the manifold axis; and a vent path at a vent angle to the manifold axis for an exhaust flow, the vent path acting to provide a fluid pressure valve upon an inlet compressed breathable gas from the constriction path to urge flow towards the source path and a by-pass for returned outlet spent gas flow from the source path against the inlet compressed breathable gas at the constriction path, the fluid pressure valve and the by-pass dependent upon the relative magnitudes of the source angle and the vent angle to the manifold axis

Abstract: There is disclosed a method and system for determining the partial pressure of at least one gas in a mixture of gasses contained in a pressure vessel, the mixture being pressurised to a level which is above local atmospheric pressure. The method comprises the steps of positioning a gas analysis sensor (14) within a pressure vessel (10); exposing the sensor to the mixture of gasses at the pressure level found in the pressure vessel; operating the sensor to measure the actual partial pressure of the at least one gas in the mixture contained in the vessel; and periodically calibrating the sensor by directing a calibrating gas mixture (20, 22) to the sensor in the chamber, the calibrating gas mixture being breathable by a human being.

Abstract: An underwater camera unit and a surface controller for controlling the underwater camera unit via an underwater cable. The camera unit includes a pressure housing containing a modem, a command processor coupled to the modem to receive control signals from the modem, an image processor coupled to the modem, to provide image data to the modem, and a camera sensor coupled to the image processor. The camera unit also includes a connector for connecting the underwater camera unit to the underwater cable. The modem is coupled to the connector. The modem is operable to multiplex image data from the image processor with control and/or monitoring signals from the command processor and transmit the multiplexed image data and control and/or monitoring signals from the underwater camera unit via the connector. The modem is also operable to receive control and/or monitoring signals via the connector and pass them to the command processor.

Abstract: There is disclosed a method and system for determining the partial pressure of at least one gas in a mixture of gasses contained in a pressure vessel, in particular a pressure vessel in the form of a life support pressure chamber/decompression chamber, or a diving gas storage cylinder. The method comprises the steps of: coupling a gas analysis sensor (14) to a pressure vessel (10); directing a portion of the mixture of gasses in the pressure vessel to the sensor for analysis; reducing the pressure of the portion of the mixture which is to be analyzed by the sensor to a level which is below the pressure in the vessel but above local atmospheric pressure; operating the sensor to measure the partial pressure of the at least one gas at the reduced pressure level; and using the partial pressure of the at least one gas, measured at the reduced pressure level, to determine the actual partial pressure of said gas in the mixture contained in the vessel.

Abstract: There is disclosed a method and system for determining the partial pressure of at least one gas in a mixture of gasses contained in a pressure vessel, in particular a pressure vessel in the form of a life support pressure chamber/decompression chamber, or a diving gas storage cylinder. The method comprises the steps of: coupling a gas analysis sensor (14) to a pressure vessel (10); directing a portion of the mixture of gasses in the pressure vessel to the sensor for analysis; reducing the pressure of the portion of the mixture which is to be analysed by the sensor to a level which is below the pressure in the vessel but above local atmospheric pressure; operating the sensor to measure the partial pressure of the at least one gas at the reduced pressure level; and using the partial pressure of the at least one gas, measured at the reduced pressure level, to determine the actual partial pressure of said gas in the mixture contained in the vessel.

Abstract: There is disclosed a method and system for determining the partial pressure of at least one gas in a mixture of gasses contained in a pressure vessel, the mixture being pressurised to a level which is above local atmospheric pressure. The method comprises the steps of positioning a gas analysis sensor (14) within a pressure vessel (10); exposing the sensor to the mixture of gasses at the pressure level found in the pressure vessel; operating the sensor to measure the actual partial pressure of the at least one gas in the mixture contained in the vessel; and periodically calibrating the sensor by directing a calibrating gas mixture (20, 22) to the sensor in the chamber, the calibrating gas mixture being breathable by a human being.

Abstract: There is disclosed a method and system for determining the partial pressure of at least one gas in a mixture of gasses contained in a pressure vessel, the mixture being pressurised to a level which is above local atmospheric pressure. The method comprises the steps of positioning a gas analysis sensor (14) within a pressure vessel (10); exposing the sensor to the mixture of gasses at the pressure level found in the pressure vessel; operating the sensor to measure the actual partial pressure of the at least one gas in the mixture contained in the vessel; and periodically calibrating the sensor by directing a calibrating gas mixture (20, 22) to the sensor in the chamber, the calibrating gas mixture being breathable by a human being.

Abstract: There is disclosed a method and system for determining the partial pressure of at least one gas in a mixture of gasses contained in a pressure vessel, the mixture being pressurised to a level which is above local atmospheric pressure. The method comprises the steps of positioning a gas analysis sensor (14) within a pressure vessel (10); exposing the sensor to the mixture of gasses at the pressure level found in the pressure vessel; operating the sensor to measure the actual partial pressure of the at least one gas in the mixture contained in the vessel; and periodically calibrating the sensor by directing a calibrating gas mixture (20, 22) to the sensor in the chamber, the calibrating gas mixture being breathable by a human being.

Abstract: There is disclosed a method and system for determining the partial pressure of at least one gas in a mixture of gasses contained in a pressure vessel, in particular a pressure vessel in the form of a life support pressure chamber/decompression chamber, or a diving gas storage cylinder. The method comprises the steps of: coupling a gas analysis sensor (14) to a pressure vessel (10); directing a portion of the mixture of gasses in the pressure vessel to the sensor for analysis; reducing the pressure of the portion of the mixture which is to be analysed by the sensor to a level which is below the pressure in the vessel but above local atmospheric pressure; operating the sensor to measure the partial pressure of the at least one gas at the reduced pressure level; and using the partial pressure of the at least one gas, measured at the reduced pressure level, to determine the actual partial pressure of said gas in the mixture contained in the vessel.