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. This sensor can be controlled by a Televac MM200 gauge controller.

 

Specifications:

 

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

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