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ETI Hot Cathode:
8136 Bayard-Alpert

Physical Data

  • Connection: 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: Thoria-Coated Iridium
  • Grid: Tungsten helix configuration

Operating Data

  • Sensitivity for N2: 8/Torr
  • X-ray Limit: 4 x 10-10 Torr
  • Operating Pressure: 1 x 10-10 to 1 x 10-1 Torr
  • Electron Bombardment Degas: 70 Watts
  • Resistance Heated Degas: 6.3 to 7.5 volts @ 10 amps
  • Bake-out Temperature: 250°C

The ETI 8136 is a broad range Bayard-Alpert gauge. The special fabricated gauge elements and burn-out resistant, thoria-coated iridium filament enable this gauge to operate up to 1 x 10-1 Torr. This gauge is likewise available in a long-life version that is position independent.

  • Pyrex® is a registered trademark of Corning.
  • Nonex® is a registered trademark of Corning.
  • Kovar® is a registered trademark of Westinghouse Electric Corp.