Patent ID: 8384026

Claim:
An atmospheric pressure ion source probe assembly for a mass spectrometer, the probe assembly comprising an outer casing adapted for attachment to an atmospheric pressure ion source chamber of a mass spectrometer and a docking probe for detachable connection to the outer casing, the arrangement being such that in its docked condition or position the probe extends through, and in sealing engagement with, the outer casing so that a sample holder carried by the probe is presented within the ion chamber and such that when the probe is detached from the outer casing the casing can be sealed off relative to the ion source chamber, the outer casing including a pivotal lever, the lever being pivotal from a closed position in which it seals off the casing relative to the ion source chamber when the probe is detached, to an open position in which it cooperates with the probe to lock the probe in its docked condition or position.