MDC Glass Enclosed Ionization Gauge Tubes are precision instruments designed to monitor high and ultrahigh vacuum pressures in the range of 1×10⁻³ to 2×10⁻¹⁰ Torr (1.3×10⁻¹ to 2.7×10⁻⁸ Pa). These gauges use the Bayard-Alpert ionization method, which includes a resistive filament, a positively charged spiral grid, and a negatively charged collector.

When energized, the filament emits electrons that are attracted to the grid and collide with gas molecules, ionizing them. The resulting ion current, collected and measured at the collector, directly corresponds to the vacuum pressure level. This method allows for highly accurate, repeatable pressure readings critical in UHV environments.

These tubes are designed with a non-burnout feature, protecting the filament from damage during brief atmospheric exposure. They are available with Pyrex® or Kovar® envelopes, and flange options include Conflat® CF and ISO Kwik-Flange™, offering excellent compatibility with various vacuum systems.

Key Features

Wide pressure range: 1×10⁻³ to 2×10⁻¹⁰ Torr (1.3×10⁻¹ to 2.7×10⁻⁸ Pa)
Non-burnout design allows for momentary exposure to atmosphere without filament failure
Bayard-Alpert configuration for sensitive and reliable vacuum readings
Flange options: Pyrex®, Kovar®, Conflat® CF (2-3/4" | 70 mm), and optional ISO Kwik-Flange™
Ideal for continuous, high-accuracy UHV pressure monitoring

Industry Applications

MDC’s glass enclosed ionization gauge tubes are ideal for semiconductor fabrication, vacuum coating, surface analysis, space simulation, and high-energy physics research. Their non-burnout design and high vacuum sensitivity make them essential for processes requiring uninterrupted and ultra-precise pressure measurement in UHV conditions.