Gas sensor and control method therefor
First Claim
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1. A gas sensor comprising:
- a gas detection chamber into which a detection gas is introduced;
a detecting element and a compensating element each disposed in the gas detection chamber and exposed to the detection gas;
a first detection device which detects concentration of a detection target gas contained in the detection gas as a function of the difference in electrical resistance values between the detecting element and the compensating element;
a dehumidifying element which is provided in the gas detection chamber, and reversibly absorbs water contained in the detection gas and drains off the water absorbed in the dehumidifying element; and
a heater which changes the temperature of the dehumidifying element, wherein heating the dehumidifying element drains off the water absorbed in the dehumidifying element;
wherein the dehumidifying element and the heater together prevent condensation within the gas detection chamber, andwherein the dehumidifying element includes a second dehumidifying member disposed on an inner wall of the gas detection chamber.
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Abstract
A gas sensor includes a gas detection chamber into which a detection gas is introduced, a detecting element and a compensating element each disposed in the gas detection chamber, a detection device which detects the concentration of a detection target gas contained in the detection gas, in accordance with a difference in electrical resistance values between the detecting element and the compensating element, and a dehumidifying element which is provided in the gas detection chamber, and reversibly absorbs water contained in the detection gas and drains off the water absorbed in the dehumidifying element.
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Citations
8 Claims
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1. A gas sensor comprising:
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a gas detection chamber into which a detection gas is introduced; a detecting element and a compensating element each disposed in the gas detection chamber and exposed to the detection gas; a first detection device which detects concentration of a detection target gas contained in the detection gas as a function of the difference in electrical resistance values between the detecting element and the compensating element; a dehumidifying element which is provided in the gas detection chamber, and reversibly absorbs water contained in the detection gas and drains off the water absorbed in the dehumidifying element; and a heater which changes the temperature of the dehumidifying element, wherein heating the dehumidifying element drains off the water absorbed in the dehumidifying element; wherein the dehumidifying element and the heater together prevent condensation within the gas detection chamber, and wherein the dehumidifying element includes a second dehumidifying member disposed on an inner wall of the gas detection chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A gas sensor comprising:
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a gas detection chamber into which a detection gas is introduced; a detecting element and a compensating element each disposed in the gas detection chamber and exposed to the detection gas; a first detection device which detects concentration of a detection target gas contained in the detection gas as a function of the difference in electrical resistance values between the detecting element and the compensating element; a dehumidifying element which is provided in the gas detection chamber, and reversibly absorbs water contained in the detection gas and drains off the water absorbed in the dehumidifying element; and a heater which changes the temperature of the dehumidifying element, wherein heating the dehumidifying element drains off the water absorbed in the dehumidifying element, wherein the dehumidifying element and the heater together prevent condensation within the gas detection chamber, and wherein the heater has a plate shape and is disposed such that the heater is located between the detecting element and the compensating element, and such that the heater follows the flow direction of the detection gas flowing into the gas detection chamber and extends past the detecting element and compensating element in a direction toward an entry of the gas detection chamber.
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Specification