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.

A pulse modulated oxygen dispensing and pressurization system provides a variable range of controlled oxygen bolus to an enclosed breathing environment supporting and maintaining required pressure conditions in accordance with desired flow demand. As oxygen is consumed by the user from within the enclosed breathing environment, the exhaled gases and moisture are conditioned or vented to acceptable levels by additional systems associated with the environment. These additional systems cause an ongoing need to replenish the oxygen within the environment and maintain the required partial pressure of oxygen. Specific to one of a plurality of modes of operation, the system responds to changes in regulated output pressure by delivering a precisely metered periodic bolus volume of oxygen to support a requirement of the environment volume. The bolus is variable based on a plurality of factors to increase and decrease changes in rates of flow required to maintain regulated pressure.

A reusable, elastomeric respirator and ventilator, with filter inserts, including a mask body having a pliant facial interface on the interior of the mask body, and two apertures centrally positioned on the front face of the mask body. Two interchangeable plugs or ports are provided to be received within and seal the apertures, deliver oxygen into the mask, or deliver liquids to a wearer of the mask. On opposing sides of the mask body are air filter housings which support an air filter, each air filter housing including a base support structure affixed to the mask body and a top securing structure removably secured to the base support structure. One or more straps are affixed to the mask body to secure the mask body about a wearer's head.

The present technology relates to open respirator devices having sensors for measuring breath biometrics. For example, a respirator device (100) can include a mask component (102) that fits at least partially over a user's face and forms a gap (112) between a periphery of the mask component and the user's face, thereby forming a breathing chamber (108) between the mask portion and the user's face. A fan unit can provide air from the external environment to the breathing chamber for the user to inhale. In some embodiments, the air may be filtered before entering the breathing chamber and the fans may provide a positive pressure seal between across the gap. One or more sensors can be coupled to the mask component for measuring one or more metrics associated with the user's breath.

Described are oxygen control systems that utilize compressed air or oxygen. The oxygen control systems may include a control device having a first inlet that enables the flow of a supply gas from a high pressure gas source at an input pressure into the control device. The control device also includes a second inlet that enables a flow of atmospheric air into the control device and an outlet in fluid communication with the first inlet and the second inlet. The control device also includes a pressure regulator that is operable in a first mode and a second mode. In the first mode, the pressure regulator reduces input pressure of the gas to a first outlet pressure at the outlet, and, in the second mode, the pressure regulator reduces the input pressure of the gas to a second outlet pressure at the outlet that is greater than the first outlet pressure.

According to one or more embodiments, a current limiting device is provided. The current limiting device includes a transformer including: a primary winding configured to accept an input current, a core electromagnetically coupled to the primary winding, and a secondary winding electromagnetically coupled to the core. The secondary winding is configured to provide a current limiting energy source based on the input current where the current limiting energy source is limited to a predetermined maximum current based on at least one characteristic of the core.

Disclosed is a chemical oxygen self-rescue device, including a breathing assembly (1), an oxygen generating assembly (2) and a gas bag; (3) the oxygen generating assembly includes an oxygen generating agent tank (21), a gas discharge valve (23) and an oxygen candle (22); the gas discharge valve is arranged on a component above an oxygen generating agent (213) in the oxygen generating agent tank and below a breathing end of the breathing assembly, and the opening and closing of the gas discharge valve are controlled by means of an inflated volume of the gas bag. The chemical oxygen self-rescue device reduces the resistance to breathing, lowers the temperature of breathed gas and improves the utilization rate of the oxygen generating agent.

A first stage pressure regulator is provided. A valve body has an inlet and an outlet that define a pressure chamber therebetween. The valve body defines a pressure compensation chamber having an opening fluidly communicating the pressure compensation chamber with the surrounding water. The first stage pressure regulator comprises an inlet tubular union removably received into the inlet. A removable high pressure orifice body defines an orifice therethrough. The orifice body is carried by the valve body proximate the inlet. A valve seat is within the valve body.

A method and apparatus for automatically controlling partial pressure of oxygen in the breathing loop of a rebreather diving system. A diver may adjustably select a control parameter to maintain partial pressure of oxygen at a setpoint that varies with ambient pressure and is within a range between a maximum safe partial pressure of oxygen at depth and a minimum safe partial pressure of oxygen for the purpose of biasing the performance of the rebreather either towards minimizing gas venting from the rebreather breathing loop or minimizing decompression time. A method and apparatus for managing and monitoring the use of dive resources in comparison with a target dive time specified by the diver, calculating and indicating remaining dive time based on dive resource values and calculating and indicating dive resource values required to meet preselected dive resource end values and dive requirements.

A breathing regulator including a first stage regulator, a second stage regulator, a dilution valve, a mixing chamber, and a controller is provided. The first stage regulator is in fluid communication with pressurized source gas. The second stage regulator is in fluid communication with the first stage regulator. The dilution valve is in fluid communication with an ambient gas and includes a size-variable restriction. The mixing chamber is in fluid communication with the second stage regulator, the dilution valve, and a breathing cavity. The controller is in electrical communication with the dilution valve, the second stage regulator, and a plurality of sensors. The controller is configured to: determine a mass flow of the source gas; determine mass flow of the ambient gas; and vary the size-variable restriction of the dilution valve based on the mass flow of the source and/or the mass flow of the ambient gas.