The point of measurement of the methodological null oxygen in order to operate the measurement equipment, and the measurement equipment in order to watching the remaining amount oxygen

摘要

PROBLEM TO BE SOLVED: To provide a measuring device for monitoring residual oxygen in exhaust gas monitoring a state allowing easy carrying out of timely intervention by a remedial measure when there is a defect in the measuring device by an auxiliary procedure.;SOLUTION: An oxygen partial pressure p_i predetermined as a desired value is formed in a reaction chamber 25 by an electrochemical oxygen ion pump driven by an electrical pump current I_p. A pump current proportional to a flow of oxygen can be used as a measurement parameter for a partial pressure p_m of the residual oxygen in the exhaust gas or its concentration. During a period N which is a normal operation period, the residual oxygen can be monitored. A lambda probe 1 can be intermittently operated. During operation periods H and L, the oxygen partial pressure p_i in the reaction chamber mainly indicates a minimum value, or a maximum value.;COPYRIGHT: (C)2005,JPO&NCIPI