Our online catalog is being updated! Please contact us for current pricing. Glass Ionization Gauge Tubes Glass Ionization Gauge Tubes Standard Ionization gauge tube Features Bayard-Alpert design Easily outgassed grid Ease of connection Nonex, Pyrex, or Kovar tubulation Thoria-coated iridium filament (burnout resistant) or dual tungsten filaments Range: 10-3 to 10-10 Torr High conductance 1.0" tubulation available Specifications Bayard-Alpert Ionization Gauge Tube Specifications Vacuum range 9.9 x 10-3 to 3 x 10-10 Torr Filament voltage 3-5 V Filament bias 30 VDC Filament current 4-6 A Grid outgass 6.3-7.5 V at approx. 10 A Collector voltage 0 VDC Linearity 10-4 to 10-10 Torr at 10 mA emission 10-3 to 10-9 Torr at 1 mA emission Ordering Information Ion Gauge Tubes. -x refers to option suffixes below Model No. Description Price IG-1-N-x Nonex glass encapsulated tube terminated with 1" tubulation.* Dual filament assembly and choice of filament material. $125. IG-1-P-x Pyrex glass encapsulated tube terminated with 1" tubulation.* Dual filament assembly and choice of filament material. $125. * 0.75" tubulation available, no extra charge. Show /075 as suffix. Options Suffix Description Additional Price -W Tungsten filaments N/C -I Thoria-coated iridium filaments N/C -K Kovar weldable transition termination $20. -CF 2.75" ConFlat flange termination $50. To order: For example, to order a Pyrex encapsulated tube with thoria-iridium filaments and terminated with a ConFlat flange, one would write: IG-1-P-I-CF.