BOURDON Vacuum Gauge
The inside of a tube which is bent into
a circular arc (the so-called Bourdon
tube) is connected to the vacuum
system. Due to the effect of the external atmospheric pressure, the end of
the tube bends more or less during the
evacuation process. This actuates the
pointer arrangement which is attached
to this point. The corresponding pressure can be read off on a linear scale.
With Bourdon gauges it is possible to
roughly determine pressures between
10 mbar (7.5 Torr) and atmospheric
pressure.