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Replacement Ion (Hot Filament) Gauge Tubes Replacement Ion (Hot Filament) Gauge Tubes 1 Replacement Ion (Hot Filament) Gauge Tubes 2 Replacement Ion (Hot Filament) Gauge Tubes 3

Replacement Ion (Hot Filament) Gauge Tubes

Bayard-Alpert (B-A) ion gauges have a reasonably linear response from 1 x 10-4 to 1 x 10-9 Torr (1 X 10 -4 torr to 5 X 10-12 torr for nude UHV gauges) with gauge sensitivities from 5 to 20 Torr-1. B-A ion gauges are available with one or two filaments, where the second filament would act as a spare). The filaments are available in two materials. The first material, a thoria-coated iridium, is used in oxygen-rich applications and is resistant to "burn-out" if exposed to atmosphere. This material is not intended for applications that will expose the filament to chemicals. The second material, tungsten, is a lower cost material that is resistant to chemical exposure, including halogen-based chemicals, but will "burn-out" if exposed to atmosphere.

Dimensional Drawings

Pinouts

Legend:

G = Grid
F1, F2 = Filament
FC = Filament Common
C = Ion Collector

Filaments Comparison:

  Iridium (ThO-Ir) Tungsten (W)
Exposure More forgiving to exposure to higher pressures Susceptible to failure if exposed to higher pressures
Outgassing Less outgassing, optimum UHV choice More outgassing, optimum for HV
Reactivity Reactive with hydrocarbon and halogen gases More stable with hydrocarbon and halogen gases
Cost More expensive Cost Effective

Specifications Table

Model Replacement Ion
Technology Glass Hot Filament Ion Gauge
Nude Hot Filament Ion Gauge
Nude UHV Hot Filament Ion Gauge
Temperature Bakeout
450 ºC
842 ºF

Materials Exposed to Vacuum Stainless Steel
Thoria-Coated Iridium
Tungsten
Typical Accuracy
±25% of reading
Recommended
Mounting Orientation
Any except for upside down
X-Ray Limit
(Torr)
3.00E-10
1.00E-12
X-Ray Limit
(mbar)
< 4.00 x 10-10


1.33E-12
Filament Count
1 - 2
Filament Type
Thoria-Coated Iridium
Tungsten
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Note:
  • Platinum (PT) Coated Filaments are used to ground spurious electrons generated by thermionic emission of the filament so that the glass does not develop a potential. This is recommended when the experiment involves detecting signals of a very small voltage.

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Ordering Table

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Description Technology Flange Filament Count Filament Pinout Filament Type Note
VacuCADSM
Part Number Price In Stock Add To Cart Accessories
Description Technology Flange Filament Count Filament Pinout Filament Type Note
VacuCADSM
Part Number Price In Stock Add To Cart Accessories
GAUGE TUBE, B-A, KOVAR, 3/4" ON 2-3/4" FLANGE, IRIDIUM FIL Glass Hot Filament Ion Gauge DN35CF-DN40CF 1 1 Thoria-Coated Iridium Limited availability and specially priced.
N/A
G075F
$211.00 In Stock
GAUGE TUBE, BAYARD-ALPERT, 3/4" KOVAR, IRIDIUM FIL. Glass Hot Filament Ion Gauge 3/4" O.D. Kovar Tube 1 1 Thoria-Coated Iridium Limited availability and specially priced.
N/A
G075K
$172.00 Call for Availability
GAUGE TUBE, BAYARD-ALPERT, 3/4" KOVAR, PT COATED IRIDIUM Glass Hot Filament Ion Gauge 3/4" O.D. Kovar Tube 1 1 Thoria-Coated Iridium Limited availability and specially priced.
N/A
G075K-PT
$192.00 In Stock
GAUGE TUBE, BAYARD-ALPERT, 3/4" NONEX, IRIDIUM FIL Glass Hot Filament Ion Gauge 3/4" O.D. Borosilicate Glass Tube 1 1 Thoria-Coated Iridium Limited availability and specially priced.
N/A
G075N
$150.00 In Stock
GAUGE TUBE, BAYARD-ALPERT, 3/4" KOVAR, DUAL TUNGSTEN FIL Glass Hot Filament Ion Gauge 3/4" O.D. Kovar Tube 2 2 Tungsten Limited availability and specially priced.
N/A
G075TK
$151.00 In Stock
GAUGE TUBE,B-A,KOVAR,1" ON 2-3/4"FLANGE,IRIDIUM FILAMENT Glass Hot Filament Ion Gauge DN35CF-DN40CF 1 1 Thoria-Coated Iridium Limited availability and specially priced.
N/A
G100F
$211.00 In Stock
GAUGE TUBE, B-A, KOVAR, 2-3/4" FLANGE,IRIDIUM FIL, PLAT COAT Glass Hot Filament Ion Gauge DN35CF-DN40CF 1 1 Thoria-Coated Iridium Limited availability and specially priced.
N/A
G100F-PT
$230.00 Call for Availability
GAUGE TUBE, BAYARD-ALPERT, 1" KOVAR IRIDIUM FIL Glass Hot Filament Ion Gauge 1.0" O.D. Kovar Tube 1 1 Thoria-Coated Iridium Limited availability and specially priced.
N/A
G100K
$172.00 In Stock
GAUGE TUBE, BAYARD-ALPERT 1" KOVAR, PT COATED IRIDIUM Glass Hot Filament Ion Gauge 1.0" O.D. Kovar Tube 1 1 Thoria-Coated Iridium Limited availability and specially priced.
N/A
G100K-PT
$192.00 Call for Availability
GAUGE TUBE, BAYARD-ALPERT, 1" KOVAR IRIDIUM FIL W/QF25 FL Glass Hot Filament Ion Gauge KF25 1 1 Thoria-Coated Iridium Limited availability and specially priced.
N/A
G100KQF25
$211.00 In Stock
GAUGE TUBE, BAYARD-ALPERT, 1" KOVAR IRIDIUM FIL W/QF40 FL Glass Hot Filament Ion Gauge KF40 1 1 Thoria-Coated Iridium Limited availability and specially priced.
N/A
G100KQF40
$211.00 Call for Availability
GAUGE TUBE, BAYARD-ALPERT, 1" NONEX, IRIDIUM FIL Glass Hot Filament Ion Gauge 1.0" O.D. Borosilicate Glass Tube 1 1 Thoria-Coated Iridium Limited availability and specially priced.
N/A
G100N
$155.00 In Stock
GAUGE TUBE, BAYARD-ALPERT, 1" NONEX, PT COATED IRIDIUM Glass Hot Filament Ion Gauge 1.0" O.D. Borosilicate Glass Tube 1 1 Thoria-Coated Iridium
N/A
G100N-PT
$173.00 Call for Availability
GAUGE TUBE,B-A,KOVAR,1" WITH 2-3/4"FLG,TWIN TUNGSTEN FILA Glass Hot Filament Ion Gauge DN35CF-DN40CF 2 2 Tungsten Limited availability and specially priced.
N/A
G100TF
$163.00 In Stock
GAUGE TUBE, BAYARD-ALPERT, 1" KOVAR, TUNGSTEN FIL Glass Hot Filament Ion Gauge 1.0" O.D. Kovar Tube 2 2 Tungsten Limited availability and specially priced.
N/A
G100TK
$136.00 In Stock
GAUGE TUBE, B-A NUDE, 2.75"FLG RESIST. DEGAS, SNGL THO-IR FIL, NO CERAMIC HOLDER ON FILAMENTS Nude Hot Filament Ion Gauge DN35CF-DN40CF 1 5 Thoria-Coated Iridium
N/A
G8120-A
P.O.R. In Stock
GAUGE TUBE, UHV NUDE, 2.75"FLG EB DEGAS,W/(2)IRIDIUM FILAMNTS Nude UHV Hot Filament Ion Gauge DN35CF-DN40CF 2 6 Thoria-Coated Iridium Limited availability and specially priced.
N/A
G8130
$453.00 In Stock
GAUGE TUBE, UHV NUDE, 2.75"FLG E-B DEGAS,W/2 TUNGSTEN FILAMNT Nude UHV Hot Filament Ion Gauge DN35CF-DN40CF 2 6 Tungsten Limited availability and specially priced.
N/A
G8130T
$432.00 In Stock
GAUGE TUBE, B-A NUDE, 2.75"FLG EB/RESIST DEGAS, 1 THO-IR FIL, CERAMIC FILAMENT HOLDER Nude Hot Filament Ion Gauge DN35CF-DN40CF 1 5 Thoria-Coated Iridium Limited availability and specially priced.
N/A
G8140
$453.00 In Stock
GAUGE TUBE,BA NUDE ION,2.75"CF EB/RESIST DEGAS,DUAL IRIDIUM Nude Hot Filament Ion Gauge DN35CF-DN40CF 1 6 Thoria-Coated Iridium Limited availability and specially priced.
N/A
G8140-DI
$475.00 Call for Availability
GAUGE TUBE,BA NUDE ION,2.75"CF EB/RESIST DEGAS,DUAL TUNGST Nude Hot Filament Ion Gauge DN35CF-DN40CF 2 6 Tungsten
N/A
G8140-DT
P.O.R. Call for Availability
GAUGE TUBE, BAYARD-ALPERT, 1/2"GLASS,CVC EQUIV,5PIN,W/FIL Glass Hot Filament Ion Gauge 1/2" O.D. 7052 Glass Tube 2 3 Tungsten
N/A
GX050-015-2
$136.00 Call for Availability
GAUGE TUBE, BAYARD-ALPERT, 3/4"GLASS,CVC EQUIV,5PIN,W/FIL Glass Hot Filament Ion Gauge 3/4" O.D. 7052 Glass Tube 2 3 Tungsten
N/A
GX075-016-2
P.O.R. Call for Availability
GAUGE TUBE, BAYARD-ALPERT, 3/4" PYREX, CVC EQUIV, 5 PIN Glass Hot Filament Ion Gauge 3/4" O.D. Borosilicate Glass Tube 2 3 Tungsten
N/A
GX075-016-P
P.O.R. Call for Availability
GAUGE TUBE, BAYARD-ALPERT, 1" 7052GLASS,CVC EQUIV,5PIN,W/FIL Glass Hot Filament Ion Gauge 1.0" O.D. 7052 Glass Tune 2 3 Tungsten
N/A
GX100-017-2
P.O.R. In Stock
GAUGE TUBE, ION, THO-IR, SS CF B-A/VARIAN 564 Glass Hot Filament Ion Gauge DN35CF-DN40CF 1 4 Thoria-Coated Iridium
N/A
GX100-564F
P.O.R. Call for Availability
GAUGE TUBE, ION, THO-1R, KOVAR TUBE, B-A/VARIAN 564 Glass Hot Filament Ion Gauge 1.0" O.D. Kovar Tube 1 4 Thoria-Coated Iridium
N/A
GX100-564K
$202.00 Call for Availability
GAUGE TUBE,ION,THOR-IR, 1"OD GLASS TUBE,VARIAN 564 Glass Hot Filament Ion Gauge 1.0" O.D. Borosilicate Glass Tube 1 4 Thoria-Coated Iridium
N/A
GX100-564N
$184.00 Call for Availability
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 Notes: 
Limited availability and specially priced.
Contact Us - Replacement Ion (Hot Filament) Gauge Tubes