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Ion Gauges
Arun Micro > Products > Ion Gauges

Ion Gauges

AIG1xG Ion Gauges

From £285.00 excl. VAT and transportation costs

Nude Bayard-Alpert ion gauges covering the vacuum range 1x10-3 to 3x10-11 mbar.

Overview

  • Range 1x10-3 to 3x10-11 mbar
  • Twin tungsten, thoria or yttria-coated filaments available
  • Degassing by electron-bombardment
  • Bakeout temperature 250ºC
  • DN40 CF mounting flange
Order Code DescriptionPrice £
AIG17GUHV BA Ion Gauge, Tungsten Filaments285.00
AIG18GUHV BA Ion Gauge, Thoria Coated Iridium Filaments325.00
AIG19GUHV BA Ion Gauge, Yttria Coated Iridium Filaments325.00
Related Products
FIL17Replacement Twin Tungsten filament assembly30.00
FIL18Replacement Twin Thoria-coated iridium filament assembly60.00
FIL19Replacement Twin Yttria-coated iridium filament assembly60.00

Filament type selection is a complex subject largely dependent on the vacuum environment they will be used in. A basic description follows but does not cover all situations.

FIL17

Tungsten filaments. These are widely used because they are relatively inexpensive. They operate hotter than other types so will evaporate contamination from the filament surface resulting in a more stable gauge operation. However, this advantage may increase outgassing from surrounding surfaces due to elevated temperatures. Tungsten is not affected by Hydrocarbons and Halogens so is the filament to use if these are present. Tungsten filaments are very fragile and will not survive exposure to air or mechanical mishandling.

FIL18

Thoria-coated iridium filaments. These operate at a relatively cool temperature (1400deg.C) resulting in reduced outgassing and chemical reactivity with other gasses. They are considered the filament of choice when operating in the ultrahigh vacuum region. Iridium does not burn out if exposed for a short time to high pressures while hot and so can survive a sudden loss of vacuum without damage.

 

FIL19

Yttria-coated iridium filaments. Exposure to the alpha particles emitted by thorium is of concern to some users. Yttria-coated filaments share very similar thermionic characteristics and behave the same as thoria-coated filaments but without the particle emission.

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