Abstract: A device for connecting a capillary (5) for capillary electrophoresis (CE) to an ionisation source (11) in an apparatus for mass spectrometry (MS) (12) is described, the device comprising a chamber (7) for an electrolyte, which chamber (7) has a first inlet (17) for the capillary (5) and a second inlet (16) for the electrolyte from a reservoir (8) and an outlet (17) for the capillary (5), where a tubular electrode (10) through which the capillary is passed, is arranged in connection to the outlet (17), and through which electrode (10) the electrolyte may flow around the capillary (5), wherein a flow chamber (31, 36) is arranged upstream for the electrode (10) in which flow chamber (31, 36) an electrically conducting surface electrically connected to the electrode (10), is arranged. Additionally, a system for analysis comprising said device for connecting is described.