Inductive coupling and flow for increased NMR sensitivity Video of the mini bubble pump in operation The WIFI-NMRS insert is filled with water. The air is sent into the inlet pipe of the insert, then a dye is deposited by syringe into its upper reservoir. The operation of the mini-bubble pump, enabling the solution to pass through the NMR area (bottom of the insert) is thus clearly visible. Obviously for the NMR experiments, the gas flow is largely reduced. Patrick BERTHAULT