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.

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.

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.

A mountable Multiple Port Distribution Manifold consisting of a selector knob through which a gas of liquid media may internally flow, between a hollow port at one end and a side port of the rotate-able Shaft within the Manifold. By rotating the Knob/Shaft, the side hole port of the Knob/Shaft assembly may selectively intersect with multiple ports within the Manifold. Said assembly also provides of an “off” position, where no Shaft/Manifold intersection allows port to port connection. The invention may be constructed of any suitable material, natural or synthetic, that is sufficiently strong to withstand the internal pressures of a gas or liquid media routed within.

A mountable Multiple Port Distribution Manifold consisting of a selector knob through which a gas of liquid media may internally flow, between a hollow port at one end and a side port of the rotate-able Shaft within the Manifold. By rotating the Knob/Shaft, the side hole port of the Knob/Shaft assembly may selectively intersect with multiple ports within the Manifold. Said assembly also provides of an “off” position, where no Shaft/Manifold intersection allows port to port connection. The invention may be constructed of any suitable material, natural or synthetic, that is sufficiently strong to withstand the internal pressures of a gas or liquid media routed within.

The present invention refers to a device for detecting the pressure of compressed gas cylinders in breathing apparatuses for scuba diving which can be powered by means of a battery, provided with a pressure sensor. The device allows the housing of sensors with sufficiently large dimensions, guaranteeing precise gas cylinder pressure readings. Furthermore, the elements that guarantee the watertight seal of the device can be replaced in a practical effective manner.

The present invention refers to a device for detecting the pressure of compressed gas cylinders in breathing apparatuses for scuba diving which can be powered by means of a battery, provided with a pressure sensor. The device allows the housing of sensors with sufficiently large dimensions, guaranteeing precise gas cylinder pressure readings. Furthermore, the elements that guarantee the watertight seal of the device can be replaced in a practical effective manner.

An underwater mask includes a frame, a transparent portion supported by the frame, a seal portion mounted on the frame and adapted to be positioned on a user's face, and a ventilation tube. The seal portion has a partition wall resting on the user's nose and forming upper and lower chambers, which communicate through a passage in the partition wall and a one-way valve to enable air to flow only from the upper to the lower chamber. The ventilation tube has separate channels providing communication between the upper and respectively the lower chamber and the outer environment, and a hub between tube and mask, fastened to the mask and connected to the tube by a joint, so that in a coupling position the hub and the tube are fastened, and in a releasing position the hub and the tube remain connected but the tube is free to swing.

An artificial gill garment (100) is provided for providing oxygen to a wearer in an underwater environment. The artificial gill garment comprises a membrane (110) configured to allow permeation of air through the membrane and prevent permeation of water through the membrane. The membrane is configured to provide an air reservoir. A method of manufacturing the artificial gill garment is also provided.

An artificial gill garment (100) is provided for providing oxygen to a wearer in an underwater environment. The artificial gill garment comprises a membrane (110) configured to allow permeation of air through the membrane and prevent permeation of water through the membrane. The membrane is configured to provide an air reservoir. A method of manufacturing the artificial gill garment is also provided.