SENSORELEMENT FUER EINE SAUERSTOFFGRENZSTROMSONDE ZUR BESTIMMUNG DES (LAMBDA)-WERTES VON GASGEMISCHEN

摘要

A sensor element for an oxygen marginal current for determining the lambda value of gaseous mixtures, in particular exhaust gases from internal combustion engines, is supplied with oxygen by a short-circuit cell (5) located in front of the pump cell (9) of the sensor element. As a result, the transverse sensitivity of the sensor element to CO2 and H2O is suppressed. To obtain a linear limiting flow at the pump cell (9) which is independent of the O2 partial pressure, a diffusion barrier (12) must be arranged between the short-circuit cell and the pump cell.