Thermionics Vacuum Products

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.

Glass Ionization Gauge Tubes

Glass Ionization Gauge Tubes

Ordering Information