Patent ID: 11953437
Assignee: ENDRESS+HAUSER OPTICAL ANALYSIS, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 13:
14. The method of claim 1, wherein, when the comparing of the second value and the third value shows that the second value and the third value are different, the method further comprises:
introducing a reference medium into the sample cell, wherein the reference medium has a known reference oxygen concentration;
emitting the second light as to stimulate the functional element to emit the third light;
detecting the third light;
evaluating the detected third light to determine a new second value representing the known reference oxygen concentration in the reference medium;
emitting the fourth light;
detecting the fourth light;
evaluating the detected fourth light to determine a new third value representing the known reference oxygen concentration in the reference medium;
comparing the new second value representing a measured oxygen concentration with the known reference oxygen concentration of the reference medium;
comparing the new third value representing another measured oxygen concentration with the known reference oxygen concentration; and
evaluating the comparison and outputting a status of the device.