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The ETI series of Bayard-Alpert ion gauges (also called a vacuum gauge, vacuum transducer, BA gauge, hot ion, or hot cathode) feature burnout-resistant yttria or coated iridium filaments or two tungsten filaments for vacuum measurement. This vacuum gauge has a wide measurement range of 10-10 to 10-3 Torr and can be outgassed for extended life of the vacuum gauge and cleaning of hot cathode contamination. The dual filament vacuum gauge design allows you to use the second filament when the first filament burns out or becomes heavily contaminated in this vacuum transducer. Filaments can also be replaced with our replacement filament assemblies (RFA), which can be found at the bottom of this page.

Looking for a cleanable, longer lasting solution? We suggest looking at our cold cathode technology, such as the 7FCS cold cathode vacuum gauge. This is a different vacuum gauge technology for ion gauge pressure measurement using a cold cathode vacuum transducer (instead of a hot cathode) which is less susceptible to contamination and is more easily cleaned when the vacuum gauge does become contaminated.