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Technical Information
Description of the UHV-24/UHV-24p Ionization Gauge
The UHV-24 Nude Ionization Gauge, with an x-ray limit of 2x10
reliable pressure measurement from 1 mTorr down to 2x10
performance at pressures lower than 2x10
The UHV-24p Nude Ionization Gauge utilizes an extremely thin collector which lowers
its x-ray limit to 5x10
5x10
Properly mounted nude gauges, where the grid structure protrudes into the vacuum
chamber, offer the lowest error in terms of the local vacuum pressure being the
same as the chamber pressure. Both gauges are available with either dual tungsten
or yttria-coated iridium filament, which are field replaceable.
Nude gauges are recommended for bakeable, all-metal, ultra-high vacuum systems
where maximum exposure to the vacuum gives the highest possible accuracy.
The gauges are designed with replaceable dual filament assemblies.
The UHV-24/UHV-24p Ionization Gauge models are the following:
X3004-64401
X3004-64402
Operation
The UHV-24/UHV-24p Nude Ionization Gauge contains three elements:
Filament – The filament serves as a source of electrons.
Grid – The grid functions as the electron collector operating at a positive
potential (typically +150 V) with respect to the filament.
Collector wire – Along the center of the cylindrical grid structure is a very small
diameter ion collector wire operating at a negative potential (typically 28 V) with
respect to the filament.
16
-12
Torr. As a result, it can measure pressure from 1m Torr down to
Torr, with reduced performance at pressures lower than 5x10
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UHV-24 gauge, dual yttria-iridium filaments,
2.75 in DN 40 ConFlat flange.
UHV-24p extended range Ion gauge, dual thoria-iridium
filaments, 2.75 in DN 40 ConFlat flange.
Agilent UHV-24/UHV-24p Ionization Gauge User Manual
-11
-10
Torr, with reduced
Torr.
-10
Torr, provides
Torr.
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