An air/gas sampling apparatus is used to retrieve, store, and ship an air/gas sample from a high-pressure air/gas source. The air/gas sampling apparatus includes a filter housing having a filter housing inlet segment and a filter housing outlet segment. The filter housing inlet segment has an inlet orifice and defines a flow restrictor passage and is removably connected to the filter housing outlet segment, defining a filter chamber at a flow restrictor passage outlet where the filter chamber holds a filter pad. As the entirety of the air/gas sample flows into the flow restrictor passage and through the filter pad to ensure the quality of the test of the air sample, the flow restrictor passage reduces the air/gas sample flowing to the filter chamber. The filtered air/gas sample is consequently delivered to and stored in a sample bag that may be shipped to a testing facility for analysis.

The invention is directed to an apparatus that allows users to dry, wash, and store their wetsuits and wetsuit accessories. The apparatus includes a receptacle with an interior sized and shaped to hold a wetsuit and a user's accessories. The receptacle comprises a drain configured on one side to dispose of any accumulated water and debris. The interior of the receptacle includes joints that allow a collapsible rack to extend or retract as desired by the user. Thus, a user can wash a wetsuit in the device reservoir, then hang the wetsuit from the drying rack for complete drying. The rack can also be folded to store the wetsuit and any desired accessories (gloves, shoes, etc.) until they are needed.

A device for testing one-way or non-return valves, for example, those used during diving, that can be used to determine whether air is able to be sucked through the one-way or non-return valve and provides a visual confirmation of the test and outcome. The present invention also includes an improved method of testing one-way or non-return valves and a device for carrying out this method to make testing the one-way or non-return valve prior to diving safer and more effective.

A system for cooling a pressurized hyperbaric chamber without pressure change includes an air compressing unit, an air cooling unit, and an air discharging hose. The pressurized hyperbaric chamber, the air compressing unit, the air cooling unit, and the air discharging hose are in fluid communication with each other. A flow of output warm air from the pressurized hyperbaric chamber is withdrawn and discharged into the air cooling unit by the air compressing unit. A heat exchanger of the air cooling unit then removes heat energy from the flow of output warm air to convert the flow of output warm air into a flow of input cold air, as the heat exchanger is in fluid communication with stored ice water within an insulated reservoir of the air cooling unit. The flow of input cold air is then discharged back into the pressurized hyperbaric chamber through the air discharging hose.

A system for cooling a pressurized hyperbaric chamber without pressure change includes an air compressing unit, an air cooling unit, and an air discharging hose. The pressurized hyperbaric chamber, the air compressing unit, the air cooling unit, and the air discharging hose are in fluid communication with each other. A flow of output warm air from the pressurized hyperbaric chamber is withdrawn and discharged into the air cooling unit by the air compressing unit. A heat exchanger of the air cooling unit then removes heat energy from the flow of output warm air to convert the flow of output warm air into a flow of input cold air, as the heat exchanger is in fluid communication with stored ice water within an insulated reservoir of the air cooling unit. The flow of input cold air is then discharged back into the pressurized hyperbaric chamber through the air discharging hose.

This flotation device for oxygen tanks is created to allow anyone dependent upon supplemental oxygen to utilize the pool or shallow water for recreation, exercise or therapy. Having their tank close to them in the pool or shallow waters, allows for more freedom of movement and safety for themselves and for others. The flotation device for oxygen tanks includes a base member flotation board with attachment members that include flotation tubes, straps, buckles and a grommet to secure the tank to the base member.

This flotation device for oxygen tanks is created to allow anyone dependent upon supplemental oxygen to utilize the pool or shallow water for recreation, exercise or therapy. Having their tank close to them in the pool or shallow waters, allows for more freedom of movement and safety for themselves and for others. The flotation device for oxygen tanks includes a base member flotation board with attachment members that include flotation tubes, straps, buckles and a grommet to secure the tank to the base member.

The present invention relates to a method for calibrating at least one sensor unit which is provided for determining a concentration of a gas in a gas mixture, wherein a limit value concentration (X.sub.G) is predetermined, comprising an initial calibration of the sensor unit at at least two concentrations (X.sub.1, X.sub.2) of the gas in a respective calibration gas mixture, at least comprising the steps of determining an initial zero point output (Y.sub.1) of the sensor unit with a first calibration gas mixture, determining a further output (Y.sub.2) of the sensor unit with a second calibration gas mixture, and forming an output straight line of the sensor unit based on the initial zero point output (Y.sub.1) and the further output (Y.sub.2), wherein the output line has an initial straight line slope (). According to the invention, the method further comprises a recalibration at a later point in time, comprising the steps of determining a limit value output (Y.sub.G) of the sensor unit with a limit value gas mixture in which the concentration (X.sub.G) of the gas substantially corresponds to the limit value concentration (X.sub.G), and forming an updated output straight line of the sensor unit based on the limit value output (Y.sub.G) and the initial zero point output (Y.sub.1) or based on the limit value output (Y.sub.G) and the initial line slope ().