Nude Hot Cathode Ionization Vacuum Pressure Sensors

Overview
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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.

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	Compatibility	rankScore	Filament	Fitting Type	Connector	Availability	Price
100005980 Hot Cathode Sensor, Nude Tube, 10^-2 - 10^-11 Torr, Tungsten, 2.75 in. CF $435 Contact Us	100005980 Hot Cathode Sensor, Nude Tube, 10^-2 - 10^-11 Torr, Tungsten, 2.75 in. CF	UNIVERSAL	1.0	Tungsten	2.75 in. CF	Custom D-sub to controller	Contact Us	$435
100005987 Hot Cathode Sensor, Nude Tube, 10^-2 - 10^-11 Torr, Tungsten, NW40 ISO-KF $415 Contact Us	100005987 Hot Cathode Sensor, Nude Tube, 10^-2 - 10^-11 Torr, Tungsten, NW40 ISO-KF	UNIVERSAL	1.0	Tungsten	ISO-KF NW40	Custom D-sub to controller	Contact Us	$415
100006841 Hot Cathode Sensor, Nude Tube, 10^-2 - 10^-11 Torr, Iridium, NW40 ISO-KF $760 Contact Us	100006841 Hot Cathode Sensor, Nude Tube, 10^-2 - 10^-11 Torr, Iridium, NW40 ISO-KF	UNIVERSAL	1.0	Yttria-coated Iridium	ISO-KF NW40	Custom D-sub to controller	Contact Us	$760
100006842 Hot Cathode Sensor, Nude Tube, 10^-2 - 10^-11 Torr, Iridium, 2.75 in. CF $760 Contact Us	100006842 Hot Cathode Sensor, Nude Tube, 10^-2 - 10^-11 Torr, Iridium, 2.75 in. CF	UNIVERSAL	1.0	Yttria-coated Iridium	2.75 in. CF	Custom D-sub to controller	Contact Us	$760

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Specifications

Sensor Type

Nude Hot Cathode Ionization
Installation Orientation

Any
Measurement Range

1.0 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 Range

5.0 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 Gas

Air, Nitrogen
Connector

Molded tube connector, custom Dsub connector to controller, maximum length is 50 ft
Bake Out Temperature

60°C with cable attached, 150°C with KF, 300°C with CF

Voltages

Filament bias: +30 V
Grid: +180 V
Filament: +4.7 V at 1.8 A
Exposed Materials

Tungsten or yttria-coated iridium (filament), nickel, Inconel® x-750, 304 stainless steel, glass, tungsten, platinum
Weight

0.9 lb (400 g) with CF
X-ray Limit

3 x 10-10 Torr
Sensitivity

9 Torr -1 (±20%)
Emission Current

1 mA at < 1 x 10-4 Torr
100 mA at > 1 x 10-4 Torr
(regulated to ±3%)
Degas Power

20 W

Specifications

Sensor Type

Nude Hot Cathode Ionization
Installation Orientation

Any
Measurement Range

1.0 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 Range

5.0 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 Gas

Air, Nitrogen
Connector

Molded tube connector, custom Dsub connector to controller, maximum length is 50 ft
Bake Out Temperature

60°C with cable attached, 150°C with KF, 300°C with CF

Voltages

Filament bias: +30 V
Grid: +180 V
Filament: +4.7 V at 1.8 A
Exposed Materials

Tungsten or yttria-coated iridium (filament), nickel, Inconel® x-750, 304 stainless steel, glass, tungsten, platinum
Weight

0.9 lb (400 g) with CF
X-ray Limit

3 x 10-10 Torr
Sensitivity

9 Torr -1 (±20%)
Emission Current

1 mA at < 1 x 10-4 Torr
100 mA at > 1 x 10-4 Torr
(regulated to ±3%)
Degas Power

20 W