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Glass Bayard-Alpert Ionization Vacuum Gauge, <1 x 10-9 - 1 x 10-3 Torr, 1.0 in. Kovar Metal
The 274006 Glass Bayard-Alpert Hot Cathode Gauge features a single thoria-coated iridium filament, a <1 x 10-9 to 1 x 10-3 Torr vacuum measurement range, and a 1 inch Kovar metal port. 274 Ionization Vacuum Gauges provide good vacuum and pressure measurement at an economical cost. Bayard-Alpert (hot cathode) gauges provide pressure measurement based on the ionization of gas molecules by a constant flow of electrons from a filament. The number of ions created is directly proportional to the density of molecules. The ions are collected and measured by a vacuum gauge controller and converted to pressure based on the sensitivity of the gauge.
Specifications
- TypeVacuum Gauge
- Sensor TypeBayard-Alpert Hot Cathode
- Vacuum Pressure Range1.0 x 10-9 to 0.001 Torr
- Accuracy±20% (typical)
- OrientationAny, Vertical preferred
- Port Size1.0 in.
- Fitting TypeKovar Metal
- EnvelopeNonex 7720 glass, 2.25 in. (57 mm) OD, 5 in. (127 mm) long
- CollectorTungsten, 0.010 in. diameter
- GridRefractory Metals
- Length6 in. (152 mm)
- Sensitivity10/Torr
- X-ray Limit3 x 10-10 Torr
- Electron Bombardment Degas100 Watts maximum
- Resistance Heated Degas6.3 to 7.5 VAC at 10 Amps (l2R)
- Collector Potential0 V
- Grid Potential+180 VDC
- FilamentSingle Thoria-coated Iridium
- Filament Heating Current4 - 6 Amps
- Filament Heating Voltage3 - 5 V
- Filament Voltage Potential+30 VDC
- Maximum Bakeout Temperature450°C