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ETI Hot Cathode:
8142 Bayard-Alpert

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: Thoria-coated Iridium or Tungsten
  • Grid: Tungsten helix configuration

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 Degas: 70 Watts
  • Resistance Heated Degas: 6.3 to 7.5 volts @ 10 amps
  • Bake-out Temperature: 250° C

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.

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