The present invention provides a method to detect tube spits and to reduce spit related artifacts in a computed tomography imaging system. An extension provides probe-to-sample separation feedback. The bend leads to a closed end spaced inward from the upper member edge and which is located laterally from the entrance with the distance between the upper member front edge and the closed end being less that the distance between the upper member front edge and the bend. The method continues with determining impairment correlations based on convolving the kernel functions. Compositions are sent through a flowmeter and a Coriolus mass flowmeter provide a Coriolus flow and sensor voltage function across the various compositions and flow rates to create an average curve and an average voltage at a given flow. The secondary LED unit emits a mixed light with an individual color in each of the different light-mixing states to compensate lighting of the main LED unit.