An apparatus (Fig. 6, 200) suitable for connecting an ionisation probe assembly (110) to a mass and/or ion mobility spectrometer comprising an attachment member 122 for releasably attaching, screw fitting 231, a probe assembly (110) to the apparatus (200). A cap 240 for enclosing the attachment member 122 is provided which is configurable to enclose the attachment member 122 when a probe assembly (110) is attached to the apparatus. The cap 240 also has an aperture 241 through which at least a portion of the probe assembly 118 can pass. A device, such as a ball bearing 242, is used to close the aperture 241 when the cap 240 encloses the attachment member 122 and when no probe assembly (110) is attached to the apparatus. This prevents contact with the attachment member 122 when the probe assembly (110) is not attached to the apparatus (200) and the cap 240 is closed.
展开▼
