MDC's Nude Ionization Gauge Tubes are engineered for high and ultrahigh vacuum (UHV) pressure measurement, offering a sensitive range of 1×10⁻³ to 2×10⁻¹¹ Torr (1.3×10⁻¹ to 2.7×10⁻⁹ Pa). Based on hot cathode Bayard-Alpert ionization technology, these gauges operate similarly to glass-enclosed versions but with improved accessibility and durability.

The open “nude” design allows for easy replacement of filaments, reducing maintenance time and cost. Electrical feedthroughs feature ceramic-to-metal seals, making them bakeable up to 450°C (842°F) for system cleaning and UHV compatibility. Two styles are available:

Resistive heating degas
Electron bombardment degas

Mounted via 2-3/4" (70 mm) Conflat flanges, these gauges can be installed in any orientation, making them ideal for flexible vacuum system designs.

Key Features

Measurement range: 1×10⁻³ to 2×10⁻¹¹ Torr (1.3×10⁻¹ to 2.7×10⁻⁹ Pa)
Bayard-Alpert configuration for enhanced UHV sensitivity
Replaceable filament assemblies for long-term maintainability
450°C (842°F) bakeout capability with ceramic-to-metal feedthroughs
Mounting: 2-3/4" Conflat flange (70 mm)
Degas options: Resistive heating or electron bombardment
Installable in any position for system versatility

Industry Applications

MDC Nude Ionization Gauge Tubes are critical components in UHV systems across semiconductor fabrication, surface science, particle physics, space simulation, and materials research. Their durability, sensitivity, and adaptability make them the standard for environments where precise pressure monitoring and high-temperature operation are essential.