Chapter 3
16
Ionization Gauge Instruction Manual - 274026 - Rev. B
Figure 3-1
Elements of a Bayard-Alpert Ionization Gauge
Figure 3-2
Series 274 Nude style Bayard-Alpert Ion Gauges
Electrons are created by a hot filament and accelerated
to the grid.
The current is actively controlled by the electronics.
The recommended operating voltage potentials are:
Collector = 0 V; Grid = +180 Vdc; Filament = +30 Vdc
See the Operating Characteristics Charts for variations of
these parameters.
Tungsten (Helical)
Filament (cathode)
Filament support
Collector wire
(ion collector)
Mesh grid
(anode)
Grid support
I
2
R Flat Ribbon
Filament (cathode)
Filament support
Collector wire
(ion collector)
Helical coil
grid (anode)
Grid support
UHV Nude B-A
Gauge with dual
tungsten filaments
Nude B-A Gauge
with thoria-coated
iridium filaments
