Glass Ionization Gauge Tubes
Bayard-Alpert design, easily outgassed grid, Nonex, Pyrex, or Kovar tubulation. Thoria-coated iridium filament (burnout resistant) or dual tungsten filaments.
Range: 10-3 to 10-10 Torr
Bayard-Alpert Ionization Gauge Tube Specifications
| Vacuum Range | 9.9 x 10-3 to 3 x 10-10 Torr |
| Filament Voltage | 3–5 V |
| Filament Bias | 30 VDC |
| Filament Current | 4–6 A |
| Grid Outgass | 6.3–7.5 V at approx. 10 A |
| Collector Voltage | 0 VDC |
| Linearity | 10-4 to 10-10 Torr at 10 mA emission
10-3 to 10-9 Torr at 1 mA emission |
Ordering Information
Glass Envelope Type Ion Gauge Tubes
-x refers to option suffixes below
| Model No. | Description |
|---|---|
| IG-1-N-x | Nonex glass encapsulated tube terminated with 1″ tubulation.*
Dual filament assembly and choice of filament material. |
| IG-1-P-x | Pyrex glass encapsulated tube terminated with 1″ tubulation.*
Dual filament assembly and choice of filament material. |
* 0.75″ tubulation available, no extra charge. Show /075 as suffix.
Options
| Suffix | Description |
|---|---|
| -W | Tungsten filaments |
| -I | Thoria-coated iridium filaments |
| -K | Kovar weldable transition termination |
| -CF | 2.75″ ConFlat flange termination |
Nude Ionization Gauge & Flange Assemblies
Nude gauges are used when direct access to a vacuum chamber is needed. Nude gauges prevent errors which have been ascribed to glass envelopes and associated tubulations. They have a closed grid structure which minimizes gas reactions and improves sensitivity by a factor of 2-1/2. The improved sensitivity and a .005″ collector results in low x-ray limiting current corresponding to pressure of about 2 x 10-11 Torr.
The gauge is available mounted on a 2-3/4″ O.D. UHV flange, greatly simplifying filament replacement. Standard filaments are made of tungsten. For long life in higher pressure and/or active gas environments, we recommend use of the thoria-coated iridium filament.
Medium to UHV Vacuum Pressure Measurement
- Range: 10-3 to 10-11 Torr
- Linear response in 10-4 and 10-5 Torr ranges with reduced emission
- Nude configuration
- Bayard-Alpert type
Specifications
Nude Bakeable Bayard-Alpert Gauge Tube Specifications
| Vacuum Range | 1 x 10-3 to 2 x 10-11 Torr |
| Filament Voltage | 3–4.5 V |
| Filament Bias | 30 VDC |
| Filament Current | 2.5–3.5 A with emission current of 4 mA |
| Grid Voltage | 180 VDC |
| Collector Voltage | 0 VDC |
| Sensitivity | 0.1 A/Torr @ 4 mA grid current
(N2 equivalent) |
| Degas Method | Electron bombardment (30–40 W @ approx. 500 V) |
| Flange | 2.75″ (70 mm) O.D. ConFlat flange |
| Length | 4.12″ overall, 3″ insertion length |
| Filament | Two tungsten filaments, two thoria-coated iridium filaments or two tungsten rhenium filaments on replaceable filament assembly |
| Grid | Tantalum grid on platinum-clad molybdenum supports with top and bottom caps |
Ordering Information
Nude Type Ion Gauge Tubes
-x refers to option suffixes below
| Model No. | Description |
|---|---|
| IG-2-x | Nude ionization gauge tube mounted on 2-3/4″ ConFlat flange |
| IG-2F-x | Replacement filaments for nude ion gauge tube |
Options
| Suffix | Description |
|---|---|
| -W | Tungsten filaments |
| -I | Thoria-coated iridium filaments |