Oxygen control in breathing apparatus
First Claim
1. An oxygen sensor arrangement for sensing the oxygen in a breathing loop of a breathing apparatus, which oxygen sensor arrangement comprises:
- at least one primary oxygen sensor arranged to operatively measure the oxygen in the breathing loop, anda control arrangement for obtaining measures from said oxygen sensor, wherein;
said at least one primary oxygen sensor is arranged in a cavity that is in fluid communication with the breathing loop; and
said cavity is provided with at least one output orifice for a test channel arrangement, which output orifice is arranged at a position adjacent to, or directly adjacent to said at least one primary oxygen sensor, andsaid test channel arrangement is adapted to operatively provide a first gas having a first known fraction of oxygen from a first gas supply to said primary oxygen sensor at a position adjacent to or directly adjacent to said primary oxygen sensor, andat least a first test valve arrangement is arranged to operatively open and close the flow of said first gas through said test channel arrangement, andsaid control arrangement is arranged to operatively actuate said first test valve arrangement so as to provide an amount of said first gas to said primary oxygen sensor via said test channel arrangement, andsaid control arrangement is arranged to operatively obtain measures from said primary oxygen sensor.
1 Assignment
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Accused Products
Abstract
An oxygen sensor arrangement is arranged to sense the oxygen in a breathing loop of a breathing apparatus. The sensor arrangement comprises at least one primary oxygen sensor arranged to operatively measure the oxygen in the breathing loop, and a control arrangement for obtaining measures from the oxygen sensor. A test channel arrangement is adapted to operatively provide a first gas having a first fraction of oxygen from a first supply to the primary oxygen sensor at a position adjacent to or directly adjacent to the primary oxygen sensor. A first test valve arrangement is arranged to operatively open and close the flow of the first gas through the test channel arrangement. The control arrangement is arranged to operatively actuate the first test valve arrangement so as to provide an amount of the first gas to the primary oxygen sensor via the test channel arrangement.
26 Citations
13 Claims
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1. An oxygen sensor arrangement for sensing the oxygen in a breathing loop of a breathing apparatus, which oxygen sensor arrangement comprises:
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at least one primary oxygen sensor arranged to operatively measure the oxygen in the breathing loop, and a control arrangement for obtaining measures from said oxygen sensor, wherein; said at least one primary oxygen sensor is arranged in a cavity that is in fluid communication with the breathing loop; and said cavity is provided with at least one output orifice for a test channel arrangement, which output orifice is arranged at a position adjacent to, or directly adjacent to said at least one primary oxygen sensor, and said test channel arrangement is adapted to operatively provide a first gas having a first known fraction of oxygen from a first gas supply to said primary oxygen sensor at a position adjacent to or directly adjacent to said primary oxygen sensor, and at least a first test valve arrangement is arranged to operatively open and close the flow of said first gas through said test channel arrangement, and said control arrangement is arranged to operatively actuate said first test valve arrangement so as to provide an amount of said first gas to said primary oxygen sensor via said test channel arrangement, and said control arrangement is arranged to operatively obtain measures from said primary oxygen sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification