US 9,808,655 B2
Method for determining partial pressure of a gaseous constituent and regulator of breathing mask for aircraft occupant
Matthieu Fromage, Saint-Arnoult-en-Yvelines (FR)
Assigned to Zodiac Aerotechnics, Plaisir (FR)
Appl. No. 13/580,404
Filed by Matthieu Fromage, Saint-Arnoult-en-Yvelines (FR)
PCT Filed Feb. 28, 2011, PCT No. PCT/IB2011/000781
§ 371(c)(1), (2), (4) Date Aug. 22, 2012,
PCT Pub. No. WO2011/104635, PCT Pub. Date Sep. 1, 2011.
Claims priority of provisional application 61/308,476, filed on Feb. 26, 2010.
Prior Publication US 2012/0325207 A1, Dec. 27, 2012
Int. Cl. A62B 18/02 (2006.01); A62B 7/00 (2006.01); A62B 7/02 (2006.01); A62B 7/14 (2006.01); A62B 18/00 (2006.01); A62B 9/00 (2006.01); A61M 16/00 (2006.01); A62B 9/02 (2006.01); B64D 10/00 (2006.01)
CPC A62B 7/02 (2013.01) [A61M 16/00 (2013.01); A62B 7/14 (2013.01); A62B 9/00 (2013.01); A62B 9/006 (2013.01); A62B 9/027 (2013.01); A62B 18/00 (2013.01); A62B 18/02 (2013.01); B64D 10/00 (2013.01); B64D 2231/025 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for determining a partial pressure or percentage of a gaseous constituent in a first gas mixture flow in a flow chamber in which the first gas mixture flow flows alternatively in an opposite direction to a second gas mixture flow, the method comprising the steps of:
a) providing a flow chamber comprising a gas sensor with a pump electrochemical cell, a sensing electrochemical cell and a sensing chamber, the pump electrochemical cell having a solid ionic conductor;
b) detecting the first gas mixture flow in the flow chamber,
c) pumping said gaseous constituent from the flow chamber into the sensing chamber through the solid ionic conductor of the pump electrochemical cell when the first gas mixture flow in the flow chamber is detected,
d) stopping pumping said gaseous constituent from the flow chamber into the sensing chamber through the solid ionic conductor of the pump electrochemical cell when the first gas mixture flow is no longer detected in the flow chamber or when the second gas mixture flow flows in the flow chamber or both, and
e) determining the partial pressure or percentage of gaseous constituent of the first gas mixture flow from data detected by the sensing electrochemical cell of the gas sensor.
 
9. A sensing device for determining a partial pressure or percentage of oxygen, comprising:
a flow chamber,
a sensing chamber,
a sensing electrochemical cell adapted to sense Nernst voltage which is a function of the oxygen in the sensing chamber,
a selective device comprising:
a solid ionic conductor of a pump electrochemical cell interposed between the flow chamber and the sensing chamber,
electrical power adapted to alternatively pump oxygen from the flow chamber into the sensing chamber through the solid ionic conductor and from the sensing chamber into the flow chamber through the solid ionic conductor,
a control device,
a flow direction sensor connected to the control device and adapted to detect a first gas flow in a first direction and/or a second gas flow in a second direction opposite to the first direction, the control device controlling pumping said oxygen from the flow chamber into the sensing chamber through the solid ionic conductor of the pump electrochemical cell when the flow direction sensor detects presence of the first gas flow in the flow chamber and for stopping pumping oxygen from the flow chamber into the sensing chamber through the solid ionic conductor of the pump electrochemical cell when the flow direction sensor does not detect the first gas mixture flow in the flow chamber or when the presence of the first gas flow in the flow chamber is detected or both; and;
a buffer chamber interposed between the flow chamber and the electrochemical cell, wherein the buffer chamber communicates with the flow chamber through a filter in low porous material.