-
Bayard-Alpert Design
-
Dual Tungsten or Burn-out Resistant Iridium
-
Non-sag Bifilar Grid
-
Linear Response
-
3/4" or 1" Pyrex
TM
or Kovar Tubulation
-
Response from 10
-10
to 10
-3
torr
S
eries G Ionization Gauge Tubes are hot cathode gauges of the Bayard-Albert
Type intended for pressure (density) measurement from 10
-3
Torr down to 3 x 10-
10 Torr. These tubes have been designed to provide long trouble-free operation
and are carefully cleaned, assembled and packaged so that they will not contaminate your
clean system. Both the burn-out-resistant iridium type and the dual tungsten types are
interchangeable.
Burn-Out Resistant Iridium Filament (G Series)
The burn-out-resistant filament is made of iridium with a layer of thoria cataphoretical-
ly coated on it. This provides long filament life and stable, easily controlled electron
emission at relatively low filament operating temperatures. Because iridium does not
oxidize rapidly, even at high temperature, occasional accidental exposure to atmospheric
pressure while hot will not appreciably damage or shorten the active life of the filament.
The burn-out resistant model is designed for convenient and reliable connection to
standard connectors.
Ionization Gauge Tubes
F2
Scientific Instrument Services, Inc.
TM
Phone: 908-788-5550
www.sisweb.com/catalog/08/F2
Physical Data
Filament Voltage
3 to 5 Volts AC
Filament Current
4 to 6 Amps AC
Grid Voltage
+150 Volts
Grid Outgas
6.3 to 7.5 Volts@ approx. 10 Amps.
Collector Voltage
-20 to -50 Volts
Sensitivity
Tungsten Filament: 100µa/µ
@8 ma grid current (Nitrogen)
Iridium Coated Filament: 100µa/µ
@10 ma grid current (Nitrogen)
Linearity
10
-4
to 10
-10
Torr @ 10 Ma
10
-3
to 10
-4
Torr @ 1 Ma grid current
Electrical Data
Bulb Material
Nonex 7720 Glass
Tube Diameter
2 1/4" max. O.D.
Tube Length
6 3/4" Maximum
Tubulation
See Chart
Mounting Position
For best results, it is recommended
that tube be mounted vertically
Recommended
Either Winchester Electronics
Socket
Connector P/N A7SH or Continental
Connector P/N 7-16SH
Dual Tungsten
Filament (T Series)
The dual tungsten filament model is
also designed for use with the same gauge
cables. By connecting control unit filament
leads to contacts "C" or "D" of the
connector, either filament may be used by
merely reversing the connector 180° on
the tube base. Because the two filaments
are independently connected, one may be
used to operate the gauge and the other
operated as a desorption filament.
The bifilar design supports the grid at
its midpoint so that the unsupported length
of grid wire is only half that in
conventionally wound grids. Thus the
tendency to sag during outgassing is
greatly reduced.
ION GAUGE
ION GAUGE
Bayard-Alpert Ion Gauge
can measure vacuum from
10-10 to 10-3 torr.
tip...
