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Nude Hot Cathode Ionization Vacuum Pressure Sensors
Overview
The Nude Tube vacuum pressure sensor is a Bayard-Alpert style ionization vacuum sensor, which uses a fine wire collector located in the center of a grid. Because of its small area, few x-rays hit the collector, and a vacuum gauge can measure pressures to very low levels. Because the sensing portion of the tube is located within the vacuum system and experiences the system true pressure, nude tubes give a representative pressure measurement and respond more quickly than a glass envelope sensor to pressure changes.
Nude Hot Cathode Ionization Vacuum Pressure Sensors are for use with only the 946 Vacuum System Controller and 937B Vacuum Gauge Controller.
- Dual filaments reduce downtime
- Lower chemical reaction rate and minimal thermal interference
- Low internal outgassing rates at low pressures
- Filaments resist damage caused by high oxygen partial pressures and accidental exposure to atmosphere
Products
| Compare | Model | Drawings, CAD & Specs | Availability | Price | |||
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100005980 Hot Cathode Sensor, Nude Tube, 10-2 - 10-11 Torr, Tungsten, 2.75 in. CF | $605 |
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100005987 Hot Cathode Sensor, Nude Tube, 10-2 - 10-11 Torr, Tungsten, NW40 ISO-KF | $415 |
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100006841 Hot Cathode Sensor, Nude Tube, 10-2 - 10-11 Torr, Iridium, NW40 ISO-KF | $760 |
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100006842 Hot Cathode Sensor, Nude Tube, 10-2 - 10-11 Torr, Iridium, 2.75 in. CF | $760 |
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Specifications
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Sensor TypeNude Hot Cathode Ionization
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Installation OrientationAny
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Measurement Range1.0 x 10-10 to 1.0 x 10-2 Torr
1.3 x 10-10 to 1.3 x 10-2 mbar
1.3 x 10-8 to 1.3 Pascal -
Set Point Range5.0 x 10-10 to 9.5 x 10-3 Torr
6.5 x 10-10 to 1.2 x 10-2 mbar
6.5 x 10-8 to 1.2 Pascal -
Calibration GasAir, Nitrogen
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ConnectorMolded tube connector, custom Dsub connector to controller, maximum length is 50 ft
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Bake Out Temperature60°C with cable attached, 150°C with KF, 300°C with CF
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VoltagesFilament bias: +30 V
Grid: +180 V
Filament: +4.7 V at 1.8 A -
Exposed MaterialsTungsten or yttria-coated iridium (filament), nickel, Inconel® x-750, 304 stainless steel, glass, tungsten, platinum
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Weight0.9 lb (400 g) with CF
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X-ray Limit3 x 10-10 Torr
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Sensitivity9 Torr -1 (±20%)
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Emission Current1 mA at < 1 x 10-4 Torr
100 mA at > 1 x 10-4 Torr
(regulated to ±3%) -
Degas Power20 W
Resources
Drawings And Cad
- Nude Tube Dimensional Drawing (55.8 kB, PDF)
Literature
- Vacuum Measurement Product Guide (711.5 kB, PDF)
Ultra-High Velocity 