Vacuum
Vacuum gauges are used to measure pressure within a wide range.
They measure from above atmospheric pressure (~ 2000 mbar (1500 Torr)) down to 10-12 mbar/torr. No single sensor technology is capable of measuring across this range.
A variety of different vacuum gauges are available, each with their own characteristics and ability to measure over multiple decades of vacuum.
In order to widen the measurement range, it is common to combine multiple technologies into a single gauge to reduce the connections needed in a system.
Vacuum Gauges
Each vacuum gauge is based on a different physical principle and is more suitable for certain applications than others. The pressure range of a vacuum gauge is determined by the measuring principle used as well as the design and structure of the measuring device.
