Hot-filament ionization gauge (Bayard-Alpert gauge)
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Bayard-Alpert ion gauges have a reasonably linear response from 1 x 10-4 Torr to 1 x 10-9 Torr, 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.
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