Measuring/Control technology

Much like to a piston, HYDRA® metal bellows convert pressure into force or motion and vice versa. They can therefore be used as sensors and actuators, whose characteristic line is defined by spring rate and hydraulic cross-section of the bellows.
The main demands placed on sensors and actuators are that they lack hysteresis and feature a constant characteristic curve, so that here too thermosetting bellows materials can be used to advantage.

Fields of application

  • Pressure-force converters for fine adjustment of optical systems
  • Sensors for gas-insulated electrical cabinets
  • Measuring and final controlling elements in radiator thermostats


Witzenmann USA LLC