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2400 Philmont Ave. PO Box 662 Huntingdon Valley, PA 19006 U.S.A. Phone: (215) 938-4400 Fax: (215) 947-7464 Email: techin@etigauges.com

Ionization Gauge Type 8142 Type 8142 is a versatile gauge constructed with a rugged bi-filar grid and a thoriated iridium filament. The interior of the tube is platinum-coated, shielding the gauge components from electrostatic and static charges which can occur in various operating conditions. This gauge contains a burn-out resistant, thoriated iridium filament. It is also available in a rugged, long-life design described in the special gauge section. 8142 Physical Data Tubulation 3/4", 1" Pyrex or Nonex Glass or 3/4", 1" Kovar, flanges are available Envelope Nonex, platinum-coated interior Mounting Position Vertical* Collector .005" Tungsten Filament Thoriated Iridium High Stability Geometry Available Grid Tungsten helix configuration *See Special Gauges Operating Data Sensitivity for N2 10/Torr X-ray limit 2 x 10-10 Torr Operating Pressure 2 x 10-10 to 1 x 10-3 Torr Electron Bombardment De-gas 70 Watts Resistance Heated De-gas 6.3 to 7.5 volts @ 10 amps Bake-out Temperature 250° C Recommended Electrical Operating Parameters Collector Potential 0 volts Shield Potential Connected to filament return Grid Potential 150 to 180 volts Filament Current 4 to 6 amps Filament Voltage 3 to 5 volts Filament Potential to Ground 30 volts 8142 Single Iridium Pin #1 Grid (G) Pin #2 Filament (F) Pin #3 Filament *Platinum Coating connected to this pin (F) Pin #4 Grid (G) About the Company | ETI Gauges: Principles of Operation | Ionization Gauges | Special ETI Gauges | OEM and Custom Designs Configurations of Standard Gauges | Earlier Model Gauges | Replacement Filament Assemblies | ETI Custom Filaments | ETI Stems | | Contact ETI | Return Home | ©1999 ETI