Type 8142 is a versatile gauge constructed with a rugged bifilar grid and a thoriated iridium filament. The interior of the tube is platinum coated, shielding the gauge components from electrostatic and static charges that can occur in various operating conditions. This gauge contains a burnout-resistant thoriated iridium filament. It is also available in a rugged, long-life design described in the special gauge section.
| 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.