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ETI Hot Cathode:
4336 Bayard-Alpert

Physical Data

  • Tubulation: 3/4", 1" Pyrex® or Nonex® Glass or 3/4", 1" Kovar®,
    flanges are available
  • Envelope: Nonex® 7720 Glass
  • 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

Ionization Gauge Type 4336 - The ETI 4336 Series of Ionization Gauges are Bayard-Alpert gauges available either with a burn-out-resistant, iridium-coated filament, or two tungsten filaments. ETI was the first to incorporate a bi-filar design grid in its Bayard-Alpert gauges. Through this design, only one-half of the grid weight is suspended on each support, thereby making it more "sag resistant" during frequent outgassing conditions.

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