Patent ID: 6913677
Filing Date: 2005-07-05
Classification: G01N

Abstract:
1. A hydrogen sensor, comprising a support element adapted to support a first electrode, a second electrode, and a reference electrode, the first electrode, the second electrode, and the reference electrode being provided in contact with a proton conduction layer, the support element having a diffusion controlling portion for establishing communication between an atmosphere containing a gas to be measured and a measurement chamber accommodating the first electrode, wherein an object gas component contained in the gas to be measured which is introduced from the atmosphere via the diffusion controlling portion is caused to be dissociated, decomposed, or reacted by applying a voltage between the first electrode and the second electrode such that a constant electric potential difference is produced between the first electrode and the reference electrode, to thereby generate protons, and concentration of the object gas component is obtained on the basis of a limiting current generated as a result of the generated protons being pumped out via the proton conduction layer from the first electrode to the second electrode; the hydrogen sensor being characterized in that an elastic seal member for sealing against the support element and against the proton conduction layer is pressed between the support element and the proton conduction layer so as to surround the first electrode, wherein the support element comprises a first support element provided on the same side as the first electrode and a second support element provided on the same side as the second electrode, and the proton conduction layer is held between the first and second support elements.