Abstract: An analyzer system for sensing a chemical characteristic of a fluid sample according to one embodiment includes a sample inlet configured to receive the sample via the sample inlet, a reagent inlet configured to receive a reagent via the reagent inlet, a reaction zone in fluid communication with the sample inlet and the reagent inlet and being configured to receive the sample from the sample inlet and the reagent from the reagent inlet for mixing the sample with the reagent; and a sensor zone in fluid communication with the reaction zone, wherein the sensor zone comprises a sensor configured to sense the chemical characteristic of the mixed sample and reagent, and further wherein the sensor zone is configured to allow automatic drainage of the mixed sample and reagent away from the sensor after the sensor has sensed the chemical characteristic of the mixed sample and reagent.