A typical Knudsen cell contains a crucible (made of pyrolytic boron nitride, quartz, tungsten or graphite), heating filaments (often made of metal tantalum), water cooling system, heat shields, and an orifice shutter.
A typical Knudsen cell consists of a container (often made of pyrolytic boron nitride, quartz, tungsten, or graphite), heating elements (typically made of metal tantalum), a cooling system utilizing water, protective barriers, and a valve for regulating the flow.