Triode & Mini Bayard-Alpert
Hot Ionization Gauges

These ETI Mini Bayard-Alpert style and ETI8138/29D20 Triode style hot ionization gauge tubesmeasure a wide vacuum range. Smaller thanstandard glass Bayard-Alpert gauges they are idealfor use in analytical instrumentation. Accidentalexposure to atmosphere at normal operatingtemperatures will not damage the gauge because ofthe use of the thoria-coated iridium filaments.

Part# Description
3103-/29D20 Triode Mini Glass with 3/4” Kovar Tube End Connection
3103-8330-11 Mini Bayard-Alpert Glass with 3/4” Kovar Tube End Connection

 Specifications
Triode: Less than 5 x 10-7 to 5 x 10-2 Torr
Mini BA: 5 X 10-8 to 5 X 10-3 Torr
Triode: +/- 15%
Mini BA: - 15% to +30%
None
0.75 in. Kovar
Thoria Coated Iridium
Specifications are for air or Nitrogen
0- 50 Degrees C, non-condensing
Triode: 6.2/Torr
Mini BA: 5.2/Torr
1.5 to 3.5 Volts
1.75 to 2.25 A
120 to 250 VDC
-20 to –50 V
2 mA
3 to 4 W
.0855 in. max OD
2.8 in. max, including pins
0.040 in.
0.275 in.