3.1
Sensor Descriptions
3
CONFIGURATIONS
3.1.3
7B Penning Magnetron Cold Cathode
The 7B Penning Magnetron cold cathode sensor has a measurement range from 1
×
10
−
7
up to 1
×
10
−
3
Torr. It indirectly measures absolute pressure by ionizing gas in the presence of a magnetic field.
Unlike hot filament sensors, the 7B is resistant to in-rushes of gas. The design of this sensor allows
for easy disassembly enabling quick cleaning and extended use.
3.1.4
7E Double Inverted Magnetron Cold Cathode
The 7E Double Inverted Magnetron cold cathode sensor has a measurement range from 1
×
10
−
8
up
to 1
×
10
−
2
Torr. It indirectly measures absolute pressure by ionizing gas in the presence of a magnetic
field. Unlike hot filament sensors, the 7E is resistant to inrushes of gas. The design of this sensor
allows for easy disassembly enabling quick cleaning and extended use.
The 7E is electrically identical to the 7F and 7FC sensors but the inclusion of a rubber o-ring that
allows for faster cleaning prevents the 7E from reaching UHV pressures.
3.1.5
7F Double Inverted Magnetron Cold Cathode
The 7F Double Inverted Magnetron cold cathode sensor has a measurement range from 1
×
10
−
11
up to 1
×
10
−
2
Torr. It indirectly measures absolute pressure by ionizing gas in the presence of a
magnetic field. Unlike hot filament sensors, the 7F is resistant to inrushes of gas. The design of this
sensor allows for an extended range of measurement and high bakeout temperatures up to 400
◦
C
with the magnets removed.
The 7F is electrically identical to the 7E and 7FC sensors but the 7F is not able to be disassembled for
cleaning. It is the sensor of choice for UHV systems that require a high temperature bakeout.
3.1.6
7FC Cleanable Double Inverted Magnetron Cold Cathode
The 7FC Cleanable Double Inverted Magnetron cold cathode sensor has a measurement range from
1
×
10
−
11
up to 1
×
10
−
2
Torr. It indirectly measures absolute pressure by ionizing gas in the presence
of a magnetic field. Unlike hot filament sensors, the 7FC is resistant to inrushes of gas. The design of
this sensor allows for easy disassembly enabling quick cleaning and extended use.
The 7FC is electrically identical to the 7E and 7F sensors but the inclusion of a copper gasket allows
the sensor to be disassembled and cleaned while still making it compatible with UHV pressures and a
moderate bakeout.
3.1.7
Mini Bayard-Alpert Sensor
The Mini Bayard-Alpert sensor has a measurement range from 1
×
10
−
10
up to 1
×
10
−
2
Torr. It
indirectly measures absolute pressure by ionizing gas. While accurate, the mini BA sensor is very
susceptible to the presence of oxygen and sudden inrushes of gas, which can cause a filament to fail.
To extend the life of the sensor, two filaments are included in each sensor.
email: sales@frederickscompany.com
tel: +1 215 947 2500
web: frederickscompany.com
mc300_im rev H
21 of 23
