Nude Bayard Alpert Ion Gauge

Nude Bayard-Alpert Ion Gauge

The Nude Bayard-Alpert Ion Gauge is a classic, high-sensitivity instrument designed for measuring ultra-high vacuum (UHV) pressures, down to the low 10^-10 Torr level when paired with an ionization gauge controller. Its open—“nude”—design provides fast response and minimal dead volume, making it a top choice for analytical instruments, research chambers, and vacuum systems demanding precise, low-pressure diagnostics.

Why Choose a Nude Bayard-Alpert Ion Gauge?

• Exceptional sensitivity: Detect pressures into the 10^-10 Torr range—ideal for UHV chamber characterization and turbo-pump performance validation.
• Minimal adsorbed volume: The exposed, filament-based “nude” structure ensures rapid equilibration and accurate readings in dynamic vacuum environments.
• Versatile compatibility: Compatible with a wide range of ion gauge controllers including popular Televac models and legacy systems.
• Field-serviceable: Simple filament assembly replacement keeps your gauge running longer with minimal downtime.

Common Applications

• Ultra-high vacuum systems in research labs and accelerator facilities.
• Mass spectrometry and surface science chambers requiring precise pressure measurement.
• Turbo-molecular pump validation and knock-down testing.
• UHV bake-out monitoring in material processing and electron optics tools.

Technical Highlights

• Pressure Range: Down to ~10^-10 Torr (dependent on controller and system conductance).
• Gauge Type: Bayard-Alpert ionization gauge with naked filament and grid assembly.
• Filament & Grid: Replaceable filament (typically tungsten) and robust ion collector grid.
• Mounting: Standard UHV flange (commonly CF or other custom mount)—ensure compatibility with your chamber.
• Maintenance: Replaceable thermionic filament; accessible design simplifies servicing.

Comparison vs. Cold-Cathode Gauges (e.g., Televac 7B)

1. Higher Sensitivity: Ion gauges reach deeper UHV (~10^-10 Torr) than cold-cathode gauges (~10^-8 Torr).
2. Faster Response: “Nude” design provides quicker pressure feedback in systems with low conductance.
3. Filament Considerations: Ionizing filaments can burn out or contaminate, whereas cold-cathodes are filament-free but slightly less sensitive.

Integration & Pairing

To use this gauge, you’ll need a compatible controller—such as a Televac MX200 (if it supports ion gauge modules), or a standalone ion gauge controller—and proper HV cabling and feedthroughs. Combine with rough-vacuum sensors (e.g., Pirani or convection gauges) for full-range pressure monitoring.

Explore our gauge offerings under vacuum gauges and controllers under gauge controllers to configure a complete solution.

Best Practices for Ion Gauge Use

• Start at moderate vacuum: Avoid initial activation at atmospheric pressure to extend filament life.
• Protect the filament: Use clean, dry vacuum without heavy gas loads or oil backstreaming.
• Schedule maintenance: Replace the filament when readings drop or after prolonged high-temperature bakeouts.

FAQs

How low can this gauge measure?

Down to approximately 10^-10 Torr, depending on system design and controller sensitivity.

What are common failure modes?

The filament can burn out or become contaminated—routine replacement and clean backing help maintain performance.

Do I need a controller?

Yes. This probe requires an ionization gauge controller to provide filament heating, high-voltage bias, and a read-out (analog or digital). High Vac Depot can source compatible controllers for you.

Why Purchase from High Vac Depot?

High Vac Depot offers expert selection guidance and access to a wide range of vacuum gauges and controllers. Our team helps you select and integrate appropriate sensors—from rough vacuum to UHV—to maintain uptime and measurement fidelity.

Request a Quote or Help

Need quotes, compatibility checks, or integration help? Contact High Vac Depot—we’ll match you with the right UHV gauge setup, including controllers, feedthroughs, cables, and spares.

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Additional information

Brand

Televac

Fredericks’ Televac® and ETI vacuum measurement brands offer the most innovative and proven vacuum technology on the market.

Bayard Alpert Nude Ionization Gauge Tubes Operation Manual