Vacuum furnaces

The precise measurement of "nothing" since 1970

It is with our passion for precision that we support our customers with their vacuum applications. Vacuum allows a great variety of manufacturing processes. The same large field of applications is served by our vacuum products. Included applications are for example process industry, coating, analytics and R & D as well as semiconductor and solar.


  • Wide range combination sensor Pirani / Bayard Alpert
  • Bayard Alpert with blowing resistant, yttrium coated double filament
  • Longterm tests confirm excellent life time: up to 100,000 shock venting cycles

Vacuum furnaces

Brazing, sintering or annealing of metals require an atmosphere free of oxygen. Therefore such processes are carried out under vacuum, partially using inert gas.


The vacuum level must be monitored and kept constantly low during the process in order to avoid oxidation of the products. Our client had to measure the pressure in his high vacuum tube furnace near the gas inlet as well as at the vacuum port with high accuracy.


Two VSH transducers have the required wide measuring range and detect the pressure at the furnaces gas inlet and vacuum port with excellent precision. They are linked to the system PLC by their serial RS485 interfaces, so that both pressure levels can be directly visualized in a diagram. This allows to easily monitoring the pressure gradient inside the furnace tube.