Bayard-Alpert Ion Gauge - Hot Cathode

Part Numbers: 3301-8305-012 3301-8305-02, 3301-8305-051, 3301-8306-02, 3302-8305-012, 3302-8305-02, 3302-8305-051, 3302-8305-212, 3302-8305-251, 3303-8305-451

Features and Benefits:

  • Low cost vacuum gauge
  • Degassing and dual filaments for extended vacuum gauge lifetime
  • Replacement filament assemblies (RFA) for extended life
  • Accurate and reliable hot cathode technology
  • Contamination resistant vacuum transducer
  • Excellent customer support for vacuum transducers

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 thoria 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) 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.

Bayard-Alpert Ion Gauges

Scroll to the right to view more information in the table below.

PriceBuyPN TFCPn gp mksFilamentCoatingFlangePin config
3303-8305-4512740431 IridiumThoriaCF406 Pin
3302-8305-0122740222 TungstenNoneCF405 Pin
3302-8305-02None2 TungstenNoneCF406 Pin
3302-8305-0512740412 TungstenNoneCF405 Pin
3302-8305-2122740502 TungstenNoneKF405 Pin
3302-8305-2512740572 TungstenNoneKF405 Pin
3301-8305-0122740232 IridiumThoriaCF405 Pin
3301-8305-02None2 IridiumThoriaCF406 Pin
3301-8305-0512740422 IridiumThoriaCF405 Pin
3301-8306-02None2 IridiumThoriaCF406 Pin

Replacement Filament Assemblies (RFA)

Scroll to the right to view more information in the table below.

PriceBuyPN TFCPn gp mksFilamentCoatingFlangePin config
5-8325-012740252 IridiumThoriaNoneNone
5-8325-022740242 TungstenNoneNoneNone
5-8325-032740291 IridiumThoriaNoneNone
Connection 2-3/4”, 1” conflat or KF 40 flange
Envelope None
Mounting Position Vertical
Collector .005” tungsten
Filament Replaceable thoria-coated iridium or dual tungsten (8130)
Grid Ta and Pt/Mo support squirrel cage
Sensitivity for N2 25/Torr
X-ray Limit 2*10-10 Torr
Operating Pressure 2*10-11 to 1*10-3 Torr
Electron-Bombardment Degas 40 W @ 500 V
Resistance-Heated Degas n/a
Bakeout Temperature 450 °C