The SVS Switching Valve System starting consists of a 4-port switching valve positioned between the spray chamber and the peristaltic pump of the spectrometer. During the rinse time when the instrument is usually idle, the autosampler cleans the probe and presents the next sample for measurement. Excess sample is diverted away from the spray chamber immediately after measurement, reducing sample carry-over. Agilent ICP Expert II Software provides easy set-up and control. Used in conjunction with the Agilent SPS 3 autosampler enables completely unattended analyses.