The instrument, shown here in lab-on-valve configuration, comprises a syringe pump, a holding coil a multiposition valve and a flow trough detector. Similar to FI, the SI readout is result of fluidically controlled dispersion and ensuing chemical reactions. Microliter volumes of sample and reagents are sequentially stacked within the holding coil and by following flow reversal transported into the detector. The result is greatly reduced reagent consumption and waste generation since the flow is discontinued between sample injections. SI instruments are produced by FIAlab, and Global FIA.