Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1994-09-15
1995-12-12
Tung, T.
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
204425, 204426, 204427, G01N 27407
Patent
active
054746655
ABSTRACT:
The invention relates to a measuring sensor having pump reference for measuring the oxygen content of gas mixtures, particularly exhaust gases of internal combustion engines. The sensor includes a measuring cell (A) and a reference cell (B) each having a pair of electrodes, with one of each respective pairs of electrodes being common to the two cells, and having a fixed electrolyte. Reference cell (B) has defined therein an internal oxygen reference zone which is hermetically sealed from the gas mixture and which is connected to the atmosphere by way of a pressure-equalization line. The measuring cell (A) and the reference cell (B) can be heated by heating apparatus to a temperature at which the fixed electrolyte has an ionic conductivity which is sufficiently high. The heating apparatus and a porous insulation are advantageously disposed in the vicinity of the electrode of the reference cell which is not in common with the measuring cell and which is porous so that the porous insulation, together with the porous electrode, form the internal oxygen reference zone and, together with the porous electrode and its porous conductor track, form the pressure-equalization line.
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Dietz Hermann
Eisele Ulrich
Fischer Hermann
Friese Karl-Hermann
Gruenwald Werner
Robert & Bosch GmbH
Tung T.
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