In some examples, a system includes a respirator configured to be worn by a user; a sensor operatively coupled to the respirator; and a computing device comprising a memory and one or more computer processors, the memory comprising instructions that when executed by the one or more computer processors cause the one or more computer processors to: in response to receiving data from the sensor, determine, during at least one action that is performed by the user and that corresponds to at least one graphical element, that the fit test was not satisfied; determine, based at least in part on particular context data associated with the fit test, at least one remedial recommendation to satisfy the fit test; and output for display the at least one remedial recommendation to satisfy the fit test.

A bypass knob for a pressure regulator configured for use with a facemask of a breathing apparatus has a first member having a first engagement surface and a second member having a second engagement surface positioned opposite the first engagement surface. At least one slot is formed on the first engagement surface and at least one deflectable beam having a latch is formed on the second engagement surface of the second member. When the first member is rotated in a first direction about the longitudinal axis via a first rotational torque, the latch of the at least one deflectable beam is engaged with the at least one slot to rotate the second member with the first member, and disengaged when the first member is rotated in the first direction via a second rotational torque higher than the first rotational torque.

A bypass knob for a pressure regulator configured for use with a facemask of a breathing apparatus has a first member having a first engagement surface and a second member having a second engagement surface positioned opposite the first engagement surface. At least one slot is formed on the first engagement surface and at least one deflectable beam having a latch is formed on the second engagement surface of the second member. When the first member is rotated in a first direction about the longitudinal axis via a first rotational torque, the latch of the at least one deflectable beam is engaged with the at least one slot to rotate the second member with the first member, and disengaged when the first member is rotated in the first direction via a second rotational torque higher than the first rotational torque.

Proposed is a mask using an oxygen supply device. The mask includes a purification cartridge which purifies air for breathing, a mask part which introduces and discharges the air purified via the purification cartridge, a connector which fastens together the purification cartridge and the mask part, and an oxygen supply device which supplies oxygen through an oxygen hose connected to the connector.

Proposed is a mask using an oxygen supply device. The mask includes a purification cartridge which purifies air for breathing, a mask part which introduces and discharges the air purified via the purification cartridge, a connector which fastens together the purification cartridge and the mask part, and an oxygen supply device which supplies oxygen through an oxygen hose connected to the connector.

In one or more embodiments, a mask configured for fluid communication with a fluid reservoir is provided. The mask includes a fluid regulator in fluid communication with the fluid reservoir where the fluid regulator is configured to regulate fluid flow. The fluid regulator includes a wireless communication unit configured to transmit and receive communication signals and a first indicator configured to generate a haptic output where the haptic output is generated based on a first frequency. The fluid regulator includes an audio capture device configured to capture audible signals and microcontroller unit configured to sample, at a second frequency, the audible signals where the second frequency is based at least in part on the first frequency, and cause the sampled audible signals to be transmitted by the wireless communication unit.

A pressure regulator assembly for an SCBA includes a valve assembly having a piston, a cylinder for receiving the piston, a sealing member for engagement by the piston, a conduit extending through the piston and facilitating fluid communication between an inlet chamber and a cavity of the cylinder, and a driving assembly for facilitating the engagement and disengagement of the piston responsive to a change of pressure in the outlet chamber. A bypass assembly for an SCBA is also disclosed.

A pressure regulator assembly for an SCBA includes a valve assembly having a piston, a cylinder for receiving the piston, a sealing member for engagement by the piston, a conduit extending through the piston and facilitating fluid communication between an inlet chamber and a cavity of the cylinder, and a driving assembly for facilitating the engagement and disengagement of the piston responsive to a change of pressure in the outlet chamber. A bypass assembly for an SCBA is also disclosed.

A pulsed oxygen delivery system is disclosed for a closed breathing environment, which includes a source of gaseous oxygen, a phase dilution type oronasal dispensing mask worn by a user in a closed breathing environment defined by a pressure suit, and a pulse control module for delivering a timed and metered bolus of oxygen from the source of gaseous oxygen to the oronasal dispensing mask upon inhalation by the user.

A pressure regulator assembly for an SCBA includes a valve assembly having a piston, a cylinder for receiving the piston, a sealing member for engagement by the piston, a conduit extending through the piston and facilitating fluid communication between an inlet chamber and a cavity of the cylinder, and a driving assembly for facilitating the engagement and disengagement of the piston responsive to a change of pressure in the outlet chamber. A bypass assembly for an SCBA is also disclosed.