Patent ID: 8316850
Filing Date: 2012-11-27
Classification: A62B

Abstract:
1. A breathing unit comprising: a tank for a breathable gas; a user's face mask, the face mask has a transparent portion which carries a transparent visual display integrally incorporated thereon, the visual display presenting an electrically generated visual image; a hose connecting the tank to the face mask; control and evaluation circuits which provides an output indicative of an airborne condition sensed by one of a plurality of field replaceable sensors including an oxygen sensor, a carbon monoxide sensor, a carbon monoxide sensor, a sensor of explosive gases and a smoke particulate sensor; and a sensor coupled to the control and evaluation circuits, the sensor is selected from the plurality of field replaceable sensors depending upon the environment in which the breathing unit is used, the selected sensor couples its identity to the control and evaluation circuits for purposes of carrying out the appropriate quality evaluation of the sensed airborne condition, the output from the control and evaluation circuits is coupled to the display so as to continually provide the visual image indicative of the sensed concentration airborne condition on the transparent portion of the face mask.