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BOURDONVAC
The inner part of the BOURDONVAC is a Bourdon tube, which is bent into a circular arc and 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 BOURDONVAC gauges it is possible to roughly determine pressures from atmosphere to 1mbar/torr.
As the mechanism is exposed to local atmospheric pressure, it can be affected by fluctuations in atmospheric pressure.
Those gauges are designed for rough pressure measurement in harsh environments:
Great process compatibility due to its stainless-steel measuring cell,
Resistance against vibrations
IP54 rating