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ETI Hot Cathode:
8140 Nude

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
  • 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 Degas: 70 Watts
  • Resistance Heated Degas: 6.3 to 7.5 volts @ 10 amps
  • Bake-out Temperature: 450° C

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 degassing, making it compatible with either type of controller. This gauge may be baked to 450°C.