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

Compatible Vacuum Controllers:

  • MKS Granville Phillips Models 260, 270, 280, 303, 306, 307, 330, 340, 350
  • MKS Instruments 290, 919, 929
  • Perkin Elmer DGC3
  • Varian 831, 836, 842, 844, 845, 880, 971-0003, 971-0014, 971-1008, Multi-Gauge
  • Veeco RG2, RG3, RG21, RG31, RG81, RG83, RG84, RG830, RG840, RG1000, RG1002

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 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.

Bayard-Alpert Ion Gauges

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

PriceBuyPN TFCPn gp mksFilamentCoatingFlangePin config
$539.00
3302-8305-0122740222 TungstenNoneCF405 Pin
$537.00
3302-8305-02None2 TungstenNoneCF406 Pin
$560.00
3302-8305-0512740412 TungstenNoneCF405 Pin
$523.00
3302-8305-2122740502 TungstenNoneKF405 Pin
$547.00
3302-8305-2512740572 TungstenNoneKF405 Pin
$551.003303-8305-4512740431 IridiumCoatedCF406 Pin
$560.003301-8305-0122740232 IridiumCoatedCF405 Pin
$558.003301-8305-02None2 IridiumCoatedCF406 Pin
$583.003301-8305-0512740422 IridiumCoatedCF405 Pin
$449.003301-8306-02None2 IridiumCoatedNo Flange (1.5" Header)6 Pin

Replacement Filament Assemblies (RFA)

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

PriceBuyPN TFCPn gp mksFilamentCoatingFlangePin config
$77.00
5-8325-022740242 TungstenNoneNoneNone
$165.005-8325-012740252 IridiumCoatedNoneNone
$110.005-8325-032740291 IridiumCoatedNoneNone

6 Pin Dual Filament Configuration

Pinout diagram for the 8140 Dual Tungsten Bayard-Alpert Vacuum Gauge.
Pin 1 Grid
Pin 2 Grid
Pin 3 Collector
Pin 4 Filament #1
Pin 5 Common
Pin 6 Filament #2

6 Pin Single Filament Configuration

Pinout diagram for the 8140 Single Iridium Bayard-Alpert Vacuum Gauge.
Pin 1 Grid
Pin 2 Grid
Pin 3 Collector
Pin 4 Filament
Pin 5 Filament
Pin 6 Not Used

5 Pin Configuration

Pinout diagram for the 8130 Bayard-Alpert Vacuum Gauge.
Pin 1 Grid
Pin 2 Collector
Pin 3 Filament #1
Pin 4 Common
Pin 5 Filament #2
Connection 2-3/4”, 1” conflat or KF 40 flange
Envelope None
Mounting Position Vertical
Collector .005” tungsten
Filament Replaceable 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