BNC feedthrough

Exhibit no. 628

The operation of a vacuum instrument, such as a mass spectrometer often requires the transmission of electrical currents, voltages or signals across the walls of vacuum chambers. This is possible with electrical feedthroughs.

They often consist of ceramic-to-metal assemblies, where the ceramic serves as an electrical insulator between the conductor and the connection flange. In addition to providing leak-tightness in high and ultra-high vacuum, some feedthroughs are resistant to high temperatures used during bake-out cleaning. Bayonet Naval Connector (BNC) vacuum feedthroughs are popular due to their quick connect coupling and compact overall size. They are generally used in low power transmission lines.

The exhibit is a BNC feedthrough used for the detector signal in MALDI-TOF mass spectrometer Tof Spec 2E manufactured by Micromass in 1990s.

Wikipedia: Feedthrough

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