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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

Nude Ionization Gauge Type 8140 The ETI 8140 Nude Ionization Gauge is a flange-mounted, Bayard-Alpert type for the range of 1 x 10-3 to 4 x 10-10 Torr. It is equipped with a bonded thoria, replaceable filament. The grid is of bi-filar construction. A .005"-diameter tungsten collector is provided for a low X-ray limit. The ETI 8140 is suited to either the I2R or the electron bombardment method of electrode de-gassing, making it compatible with either type of controller. This gauge may be baked to 450° C. 8140 Physical Data Connection 2-3/4" Conflat or KF 40 flange Envelope None Mounting Position Vertical Collector .005" Tungsten Filament Replaceable Thoria-Coated Iridium or Dual Tungsten High Stability Geometry* Available in Iridium Only Grid Tungsten helix configuration Operating Data Sensitivity for N2 10/Torr X-ray limit 4 x 10-10 Torr Operating Pressure 4 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 450° C Recommended Electrical Operating Parameters Collector Potential 0 volts Shield Potential n/a Grid Potential 150 to 180 volts Filament Current 4 to 6 amps Filament Voltage 3 to 5 volts Filament Potential to Ground 30 volts 8140 Single Iridium 8150/8150T Pin #1 Grid Pin #1 Grid Pin #2 Grid Pin #2 Grid Pin #3 Collector Pin #3 Collector Pin #4 Filament Pin #4 Filament #1 Pin #5 Filament Pin #5 Common Pin #6 Not Used Pin #6 Filament #2 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