초록 ▼

A flueric partial pressure sensor (10) includes a flueric bridge sensor (10a) having two bridge legs (11, 12) adapted for sensing a reference-gas and a sample-gas. A linear resistor (14, 15) and an orifice resistor (16, 17) are incorporated in each leg and arranged to cause asymmetric flow rates the

A flueric partial pressure sensor (10) includes a flueric bridge sensor (10a) having two bridge legs (11, 12) adapted for sensing a reference-gas and a sample-gas. A linear resistor (14, 15) and an orifice resistor (16, 17) are incorporated in each leg and arranged to cause asymmetric flow rates therethrough. Inlets to the two bridge legs are subject to a datum pressure within a datum pressure chamber (38) so that a change of datum pressure automatically changes control signals output by the sensor. The partial pressure sensor is disclosed in combination with a molecular sieve type gas concentration system (24) in an on-board oxygen enrichment of air system for an aircraft and enables the oxygen concentration in oxygen enriched air delivered by the system to be appropriate to breathing requirement at an altitude intermediate aircraft cabin and ambient atmospheric pressures.

대표청구항 ▼

A method of changing control signals output by a flueric partial pressure sensor, said sensor comprising a flueric bridge having two legs adapted for respectively sensing a reference-gas and a sample-gas mixture, each leg including a linear flow resistor and an orifice flow resistor having values ar

A method of changing control signals output by a flueric partial pressure sensor, said sensor comprising a flueric bridge having two legs adapted for respectively sensing a reference-gas and a sample-gas mixture, each leg including a linear flow resistor and an orifice flow resistor having values arranged to cause asymmetric flow rates through the two legs so that at a particular partial pressure of a constituent gas in the sample-gas mixture the bridge is in balance, the method including the steps of pressure referencing the reference-gas and the sample-gas mixture to a datum pressure and changing the datum pressure to change the control signals output by the sensor above a predetermined altitude.