The 274008 Glass Bayard-Alpert Hot Cathode Gauge features a single thoria-coated iridium filament, a -9 to 1 x 10-3 Torr vacuum measurement range, and a 2.75 inch non-rotatable CF flange with 1 inch inlet 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.
Технические характеристики
- Type Vacuum Gauge
- Sensor Type Bayard-Alpert Hot Cathode
- Vacuum Pressure Range 1.0 x 10-9 to 0.001 Torr
- Accuracy ±20% (typical)
- Orientation Any, Vertical preferred
- Port Size 1.0 in.
- Fitting Type 2.75 in. CF Flange
- Envelope Nonex 7720 glass, 2.25 in. (57 mm) OD, 5 in. (127 mm) long
- Collector Tungsten, .010 in. diameter
- Grid Refractory Metals
- Length 6 in. (152 mm)
- Sensitivity 10/Torr
- X-ray Limit 3 x 10-10 Torr (approximate)
- Electron Bombardment Degas 100 Watts maximum
- Resistance Heated Degas 6.3 to 7.5 VAC at 10 Amps (l2R)
- Collector Potential 0 V
- Grid Potential +180 VDC
- Filament Single Thoria-coated Iridium
- Filament Heating Current 4 — 6 Amps
- Filament Heating Voltage 3 — 5 V
- Filament Voltage Potential +30 VDC
- Maximum Bakeout Temperature 450°C
