842-002 is a high-precision replacement thoria-coated filament assembly designed specifically for MKS Microvision and/or e-Vision Residual Gas Analyzers (RGA). This critical component is utilized within Closed Ion Sources (CIS) to provide a reliable source of electrons for ionizing gas molecules prior to their entry into the mass spectrometer's filter.

In high-conductance closed ion sources, these filaments are essential for achieving the sensitivity required for trace gas analysis and process monitoring.

The closed ion source analyzer is manufactured from vacuum prepared stainless steel and high density alumina ceramics, and features independently replaceable twin filaments to provide built-in backup in the event of a filament failure.

To verify compatibility with specific RGA models, consult the “specifications” section below.