Ionization Vacuum ION Tube type TG100N cha new in box 2 available DUNIWAY For Sale
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Ionization Vacuum ION Tube type TG100N cha new in box 2 available DUNIWAY:
$54.00
Ionization Vacuum ION Tube type TG100N cha
new in box 2 available
Bayard-Alpertion gauges have a reasonably linear response from 1 x 10-4Torr to 1 x 10-9Torr, with gauge sensitivities from 5 to 20 Torr-1. B-A gauges are available with one or two filaments (the second acting as a spare) and with two filament materials thoria-coated iridium, used in oxygen-rich applications and for \'burn-out\' protection if accidentally vented and tungsten, used for lower cost and in residual gases containing halogens.
The standard B-A gauge measures down to 1 x 10-9Torr. It does not go lower because primary electrons generate soft X-rays when they hit the grid. An X-ray hitting the ion collector electrode releases a photo-electron, which is indistinguishable from positive ions arriving there. Below 1 x 10-9Torr, photo-electron emission is a large enough fraction of the ion current to distort the pressure reading. Special B-A structures with ultra-thin ion collectors will reach 10-10Torr and perhaps even into the 10-11Torr range.
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