US 9,808,656 B2
System and method of oxygen deficiency warning in a powered air purifying respirator
Vinay Kumar Vinnakota, Andhra Pradesh (IN); Praveen Kumar Palacharla, Andhra Pradesh (IN); and Swapnil Gopal Patil, Maharashtra (IN)
Assigned to Honeywell International Inc., Morris Plains, NJ (US)
Filed by Vinay Kumar Vinnakota, Andhra Pradesh (IN); Praveen Kumar Palacharla, Andhra Pradesh (IN); and Swapnil Gopal Patil, Maharashtra (IN)
Filed on Jan. 9, 2012, as Appl. No. 13/346,340.
Prior Publication US 2013/0174845 A1, Jul. 11, 2013
Int. Cl. A62B 18/00 (2006.01); A61M 16/06 (2006.01); A62B 9/00 (2006.01)
CPC A62B 18/006 (2013.01) [A62B 9/006 (2013.01); A61M 16/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A powered air purifying respirator (PAPR), comprising:
an electric motor mechanically coupled to a blower configured to draw ambient atmospheric air through one or more purifying elements for delivery to a face mask;
an oxygen sensor configured to detect oxygen concentration level in ambient atmospheric air;
an alarm device; and
a controller coupled to the oxygen sensor and to the electric motor, wherein the controller controls the electric motor, wherein the controller determines if the oxygen concentration is deficient by comparing the oxygen concentration level in the ambient atmospheric air to an ambient atmospheric air oxygen deficiency threshold, wherein the ambient atmospheric air oxygen deficiency threshold is based on altitude, and wherein the controller commands the alarm device to present an indication when the oxygen concentration is deficient.