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US 2002/0157447 A1Published application
Automatic calibration mode for carbon dioxide sensor
AssigneeEdwards Systems Technology, Inc.
InventorMichael B. Schell
Life of this patent
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Abstract
An automatic calibration mode for a carbon dioxide sensor is based on using a zero gas. The sensor is designed to recognize a distinctive rate of change pattern of carbon dioxide concentrations that would be indicative of a zero calibration routine. This approach can be used for other infrared sensors.
Claims16
An automatic calibration mode for a carbon dioxide sensor, said mode comprising:
- (a) determining a baseline carbon dioxide concentration value for sensor operation;
- (b) injecting a zero gas into said sensor;
- (c) determining whether at least one drop in carbon dioxide concentration value occurs below the baseline value over a predetermined time period;
- and
- (d) activating recalibration of said sensor when said drop in carbon dioxide concentration occurs.
2 more elements
Dependencies are inferred from the claim text.