Ionization Gauge Tubes (Catalog F26)

Ionization Gauge Tubes

F26

Phone: 908-788-5550

www.sisweb.com

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 inter-

changeable.

•

Bayard-Alpert Design

•

Dual Tungsten or Burn-out Resistant Iridium

•

Non-sag Bifilar Grid

•

Linear Response

•

3/4" or 1" Pyrex™ or Kovar Tubulation

•

Response from 10

-10

to 10

-3

torr

Burn-Out Resistant Iridium Filament (G Series)

The burn-out-resistant filament is made of iridium with a layer of thoria cataphoretically

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.

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 fil-

ament 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 out-

gassing is greatly reduced.

T

ECH

T

IP

Bayard-Alpert Ion Gauge can measure

vacuum from 10

-10

to 10

-3

torr.