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Ionization Gauges

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Ionization Gauges

Description


Glass Ionization Gauge Tubes

Bayard-Alpert design, easily outgassed grid, Nonex, Pyrex, or Kovar tubulation.  Thoria-coated iridium filament (burnout resistant) or dual tungsten filaments. 

Range: 10-3 to 10-10 Torr

Ionization Gauge_Glass_Type

Bayard-Alpert Ionization Gauge Tube Specifications

Vacuum Range9.9 x 10-3 to 3 x 10-10 Torr
Filament Voltage3–5 V
Filament Bias30 VDC
Filament Current4–6 A
Grid Outgass6.3–7.5 V at approx. 10 A
Collector Voltage0 VDC
Linearity

10-4 to 10-10 Torr at 10 mA emission

10-3 to 10-9 Torr at 1 mA emission

ion-std
Ordering Information
Glass Envelope Type Ion Gauge Tubes
-x refers to option suffixes below
 

Model No.Description
IG-1-N-x

Nonex glass encapsulated tube terminated with 1″ tubulation.*

Dual filament assembly and choice of filament material.

IG-1-P-x

Pyrex glass encapsulated tube terminated with 1″ tubulation.*

Dual filament assembly and choice of filament material.

* 0.75″ tubulation available, no extra charge. Show /075 as suffix.

Options

SuffixDescription
-WTungsten filaments
-IThoria-coated iridium filaments
-KKovar weldable transition termination
-CF2.75″ ConFlat flange termination

Nude Ionization Gauge & Flange Assemblies

Nude gauges are used when direct access to a vacuum chamber is needed. Nude gauges prevent errors which have been ascribed to glass envelopes and associated tubulations.  They have a closed grid structure which minimizes gas reactions and improves sensitivity by a factor of 2-1/2.  The improved sensitivity and a .005″ collector results in low x-ray limiting current corresponding to pressure of about 2 x 10-11 Torr.

NUDE_IONIZATION_GAUGE

The gauge is available mounted on a 2-3/4″ O.D. UHV flange, greatly simplifying filament replacement. Standard filaments are made of tungsten. For long life in higher pressure and/or active gas environments, we recommend use of the thoria-coated iridium filament.

Medium to UHV Vacuum Pressure Measurement

  • Range: 10-3 to 10-11 Torr
  • Linear response in 10-4 and 10-5 Torr ranges with reduced emission
  • Nude configuration
  • Bayard-Alpert type

Specifications

Nude Bakeable Bayard-Alpert Gauge Tube Specifications

 Vacuum Range 1 x 10-3 to 2 x 10-11 Torr
Filament Voltage3–4.5 V
Filament Bias30 VDC
Filament Current2.5–3.5 A with emission current of 4 mA
Grid Voltage180 VDC
Collector Voltage0 VDC
Sensitivity

0.1 A/Torr @ 4 mA grid current

(N2 equivalent)

Degas MethodElectron bombardment (30–40 W @ approx. 500 V)
Flange2.75″ (70 mm) O.D. ConFlat flange
Length4.12″ overall, 3″ insertion length
FilamentTwo tungsten filaments, two thoria-coated iridium filaments or two tungsten rhenium filaments on replaceable filament assembly
GridTantalum grid on platinum-clad molybdenum supports with top and bottom caps

Ordering Information
Nude Type Ion Gauge Tubes
-x refers to option suffixes below

Model No.Description
IG-2-xNude ionization gauge tube mounted on 2-3/4″ ConFlat flange
IG-2F-xReplacement filaments for nude ion gauge tube

Options

SuffixDescription
-WTungsten filaments
-IThoria-coated iridium filaments