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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 8138/29D20 The 8138/29D20 is a directly heated triode ionization gauge intended for the continuous measurement of vacuum in the range of 10-1 to 10-7 Torr. Short-term readings of up to 1 Torr can be monitored. Accidental exposure to Atmosphere at normal operating temperature will not damage the gauge. The use of a thoria-coated iridium filament makes this possible. In coating these filaments, great care must be exercised in controlling the cataphoritic process for the application of the thoria. 8138/29D20 Physical Data Tubulation 7/8" Glass/ .750 Kovar Envelope 7052/7056 Mounting Position Any Collector .005" Nickel Mesh Filament Thoriated Iridium Operating Data Sensitivity for N2 5.5/Torr Operating Pressure 1 x 10-7 to 1 x 10-1 Torr Electron Bombardment De-gas 700 volts Recommended Electrical Operating Parameters Collector Potential -20 to -50 volts Grid Potential 120 to 250 volts Filament Current 1.5 amps Filament Voltage 1.5 to 3.5 volts Filament Potential to Ground +20 volts Pin Configuration Pins #1, 5, 9 Collector (C) Pins #3, 7 Grid (G) Pins #2, 6, 8 Filament Common (Fc) Pin #4 Filament (F) 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