4336 Glass Bayard-Alpert Ionization Gauge

The ETI 4336 Series of ionization gauges are Bayard-Alpert gauges available either with a burnout-resistant iridium-coated filament or two tungsten filaments. ETI was the first to incorporate a bifilar 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.

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
Sensitivity for N2 10/Torr
X-ray Limit 2×10-10 Torr
Operating Pressure 2×10-10 to 1×10-3 Torr
Electron-Bombardment Degas 70 W
Resistance-Heated Degas 6.3 V to 7.5 V @ 10 A
Bakeout Temperature 250 °C

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