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CHAPTER 6
Vacuum Terminology and the VacuGuard
Atmospheric pressure is defined at 760 torr (at sea level, when the barometric
pressure is 29.92 Hg).
One torr is 1/760 of atmospheric pressure. One torr can also be expressed as 1000
millitorr or 1000 Microns.
One millitorr or one micron is 1/760,000 of atmospheric pressure.
The thermocouple sensor that are used with your VacuGuard instrument are designed to
measure a small portion of that wide band of reduce pressure that extends from
atmospheric pressure to a region known as very ultrahigh vacuum (~1x10
total spectrum of measurable vacuum contains about 18 decades of pressure.
For example:
The TELEVAC 2A series sensor measure from 20 torr to 1 millitorr. Five decades.
The DV-6/DV-6R sensors measure from 1 torr to 1 millitorr. Four decades.
The DV-4 measures from 20 torr to 0.1 torr. Two decades.
Please realize that the smaller the dynamic range of the sensor, the less visibility the
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Useful Information
user has to pressure changes.
TELEVAC
-14
torr). This
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