8140 Nude Ionization Gauge

The ETI 8140 Nude Ionization Gauge is a flange-mounted Bayard-Alpert type for the range of 1 × 10-3 to 4 × 10-10Torr. It is equipped with a bonded-thoria replaceable filament. The grid is of bifilar construction. A .005” diameter tungsten collector is provided for a low X-ray limit. The ETI 8140 is suited to either the I2R or the electron bombardment method of electrode degassing, making it compatible with either type of controller. This gauge may be baked to 450 °C.

Connection2-3/4” conflat or KF 40 flange
Mounting PositionVertical
Collector.005” tungsten
FilamentReplaceable thoria-coated iridium or dual tungsten
GridTungsten helix configuration

Sensitivity for N210/Torr
X-ray Limit4 × 10-19 Torr
Operating Pressure4 × 10-10 to 1 × 10-3 Torr
Electron-Bombardment Degas70 W
Resistance-Heated Degas6.3 V to 7.5 V @ 10 A
Bakeout Temperature450 °C