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US 8,543,340 B2Granted
Self-adjusting electrochemical sensor
AssigneeHoneywell International Inc.
InventorLee D. Tice
Life of this patent
Estimating the term…
Abstract
A gas detector with a compensated electrochemical sensor exhibits altered sensitivity in response to decreasing stochastic noise in an output thereof. A gain parameter can be adjusted to alter sensitivity. A life-time estimate can be made based on sensitivity.
Claims9
A method of determining the functionality of an electrochemical sensor in a gas detecting apparatus, comprising:
- measuring the electrical noise level in an output signal of an electrochemical gas sensor circuit;
- establishing a predetermined threshold;
- comparing the electrical noise level to the predetermined threshold;
- performing an electronic functionality test of the electrochemical sensor if the electrical noise level is lower than the predetermined threshold;
- and
- indicating a trouble condition if the electrochemical sensor fails the electronic functionality test.
3 more elements
A gas detecting apparatus comprising:
- an electrochemical sensor;
- circuitry including a processor coupled to the electrochemical sensor, the processor receiving signals from the circuitry indicative of noise in the electrical signals from the electrochemical sensor and establishing a noise value associated with the electrochemical sensor;
- circuitry for comparing the noise value with a predetermined limit value;
- electronic test circuitry for determining a functionality condition of the electrochemical sensor;
- and
- output circuitry coupled to the processor to indicate the functionality condition of the electrochemical sensor.
3 more elements
Dependencies are inferred from the claim text.