An analyzer compensates for gas flow perturbations by providing a makeup flow of carrier gas to maintain the pressure andor flow rate of analyte and inert gas through a detector constant such that a accurate determination of a low concentration of an analyte in the presence of a high concentration of a second analyte can be accurately determined. The active material may be photovoltaic, light emitting or ion conducting. The method continues with the processing module determining logical storage slots within the selected storage units based on the total width value, the number of selected, and the number of selected storage units. An actuation of the actuation mechanism control may be configured to gradually straighten the flexible housing tube. Error indications may be outputted to a user of the system in respect to a log entry or a timeframe. The low pass filter and integration unit performs a filtering operation on the differential-mode output signal and integration operations to output the differential-mode feedback signal to the differential-mode integrator.