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US 2022/0011256 A1Published application
Electrochemical Gas Sensing
AssigneeAeroqual Limited
InventorsGeoffrey Stephen Henshaw, Anna Kate Farquhar
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AssigneeAeroqual Limited
InventorsGeoffrey Stephen Henshaw, Anna Kate Farquhar
Estimating the term…
Electrochemical gas sensors are positioned in housings having open inlets for ambient gases. Leak tight caps fit over gas inlet while currents are detected until output currents are stabilized and zero baseline currents or establish for sensor calibration. The leak tight caps are removed and replaced by caps holding porous fabric membranes over the inlets. The porous fabric membranes are made of natural fibres based on keratin, cellulose, linen, as well as man-made viscose and blends. The porous fabric membranes reduce rapid humidity responses without appreciably affecting sensor responses to target gases. The porous fabric membranes release heat when water is absorbed and absorb heat when water is released. The porous fabric membranes buffer changes in temperature and humidity without significantly decreasing the gas being detected.
An electrochemical gas sensor with a porous membrane that can absorb and desorb water in response to a change in humidity or dew point or water vapor pressure held in front of the electrochemical gas sensor gas inlet so that the air being sampled by the gas sensor must diffuse through the porous membrane before entering the gas sensor.
A method comprising, measuring
A method comprising calibrating a zero baseline current of an electrochemical gas sensor by covering an inlet of the sensor with a leak tight cap and waiting for a period of time until a current stablises and using resultant stabilized current as the zero baseline current for the sensor calibration.
Dependencies are inferred from the claim text.