Utilizes vapor density measurement manner and that manner due to the marginal electric current type gas sensor the vapor density measurement device

摘要

PROBLEM TO BE SOLVED: To continuously and accurately measure the concn. of steam by using a limit current type gas sensor. ;SOLUTION: A sensor calculates the ratio SL₁/SL₁' of the oxygen concn. output signal SL₁ shown corresponding to definite oxygen concn. Po by the sensor and the oxygen concn. output signal SL₁' shown corresponding to the same oxygen concn. Po thereafter by the sensor to set the same an oxygen concn. correction factor (k) and multiplies the steam concn. output signal SL₂' shown corresponding to steam concn. PH by the oxygen concn. correction factor (k) to calculate a correction signal k*SL₂'. The concn. of steam is operated from the correction signal k*SL₂' on reference to the corresponding relation PH=f(SL₂) [f; function mark] with the steam concn. PH and the steam concn. output signal SL₂ of the sensor before deterioration.;COPYRIGHT: (C)1997,JPO