Glass Bayard Alpert Ion Gauge - Hot Cathode

The ETI series of Bayard Alpert ion gauges (also called a vacuum gauge, vacuum transducer, or hot cathode) feature a burnout-resistant iridium coated filament 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. The interior of this vacuum gauge is platinum coated, shielding the vacuum gauge components from electrostatic and static charges that can occur in various hot cathode operating conditions.

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.


The Televac Series Bayard Alpert Ion Gauge – Hot Cathode – Features

  • Low cost vacuum gauge
  • Outgassing and dual filaments for extended vacuum gauge lifetime
  • Reliable hot cathode technology
  • Contamination resistant vacuum transducer and resistant to inrushes of gas
  • Excellent customer support for vacuum transducers

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

PriceBuyPN TFCPn gp mksArm materialFilamentCoatingArm diamFlangePin config
3202-2112-00NoneMetal Kovar2 TungstenNone0.75"None6 Pin
3202-2202-01274 018Metal Kovar2 TungstenNone1.0"CF40-F6 Pin
3202-1202-00274 015Pyrex2 TungstenNone1.0"None6 Pin
3202-2102-00274 013Metal Kovar2 TungstenNone0.75"None6 Pin
3202-2102-09274 017Metal Kovar2 TungstenNone0.75"CF406 Pin
3202-0102-00NoneNonex2 TungstenNone0.75"None6 Pin
3202-1102-00274 012Pyrex2 TungstenNone0.75"None6 Pin
3200-2203-00274 006Metal Kovar1 IridiumThoria1.0"None4 Pin
3200-2103-09274 007Metal Kovar1 IridiumThoria0.75"CF404 Pin
3200-2103-00274 003Metal Kovar1 IridiumThoria0.75"None4 Pin
3200-1103-00274 002Pyrex1 IridiumThoria0.75"None4 Pin
Tubulation 3/4”, 1” Pyrex® or Nonex® glass or 3/4”, 1” Kovar® flanges are available
Envelope Nonex® 7720 glass
Mounting Position Vertical
Collector .005” tungsten
Filament Thoria-coated iridium or tungste
Grid Tungsten helix configuration
Sensitivity for N2 10/Torr
X-ray Limit 2*10-10 Torr
Operating Pressure 2*10-10 to 1*10-3 Torr
Electron-Bombardment Degas 70 W
Resistance-Heated Degas 6.3 V to 7.5 V @ 10 A
Bakeout Temperature 250 °C

Pyrex® is a registered trademark of Corning.
Nonex® is a registered trademark of Corning.
Kovar® is a registered trademark of Westinghouse Electric Corp.