Gas Polarographic Humidity Sensor Usable above 100°C

Usui, Toshio; Kurumiya, Youichi; Ishibashi, Kohsei; Nakazawa, Mitsuhiro

doi:10.1143/jjap.28.2325

Cited by 6 publications

(2 citation statements)

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“…type oxygen sensors may be also applied to other gases which give-off or consume oxygen [9][10][11]. Some of the possible gas reactions and the corresponding Gibbs energies of formation, AG ~, and the electrical potential vs.…”

Section: Application To Other Gases the Limiting Currentmentioning

confidence: 99%

Limiting current oxygen sensors for the percentage to ppm range

Liu

Weppner

1997

Ionics

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Abstract.Oxygen sensors based on the limiting current principle were investigated by employing TZP (tetragonal zirconia polycrystals) as solid electrolyte. Current-voltage curves of the sensors indicate that the operation temperature may be as low as 330 ~ in air and at lower oxygen concentration. A linear relationship is observed from 1 to 20 % oxygen in argon gas. The temperature dependence of the sensor' s output current is presented which limits the operating temperature range under the condition of a constant applied voltage. The critical parameters of limiting current oxygen sensors which may work in the ppm range are discussed. A linear current signal is obtained at optimized temperatures and applied voltages. The sensor shows many potential applications in fields of controlling inert process gases and leak detection.

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Section: Application To Other Gases the Limiting Currentmentioning

confidence: 99%

Limiting current oxygen sensors for the percentage to ppm range

Liu

Weppner

1997

Ionics

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“…This oxygen sensor is also capable of measuring hydrogen (H2) (8) and nitrous oxide (N20) (9). Furthermore, it can be used for detecting absolute humidity because of the formation of the oxygen ions at the cathode due to the electrochemical decomposition of water vapor (10)(11)(12)(13)(14). In particular, these humidity-sensing characteristics are of great interest and value from a practical viewpoint in that they can be used for continuous monitoring and controlling of the absolute humidity in a high-temperature atmosphere above 100~ (13,14).…”

mentioning

confidence: 99%

Humidity‐Sensing Characteristics in Wet Air of a Gas Polarographic Oxygen Sensor Using a Zirconia Electrolyte

Usui

Asada

Ishibashi

et al. 1991

J. Electrochem. Soc.

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Humidity-sensing characteristics in wet air of a gas polarographic oxygen sensor using a zirconia electrolyte have been investigated. This oxygen sensor showed two limiting current plateaus in wet air by analogy with the polarographic process, compared to one limiting current plateau in dry air. The first limiting current was approximately proportional to the oxygen concentration in the atmosphere. On the contrary, the second limiting current was related to the fact that oxygen ions, produced by the electrochemical decomposition of water vapor at the cathode of the sensor, passed through the zirconia electrolyte. As a result, the difference between the second and the first limiting currents increased with water vapor concentration in the ambient atmosphere. Thus, this oxygen sensor can be also used for detecting humidity in wet air.

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