Over the last few years, we at EP-E have designed and introduced a series of primary standards for gases, designed for use in calibration laboratories. As a technology partner of the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig, our solutions are based on the highest standards. The EP gas bell plungers generate a volume flow which is traceable to the SI units length and time. The pistons are driven by a stepper motor via a spindle. In the initial state one piston is fully retracted and the other fully extended. The volume flow can be set with high precision via the piston cross section and the travel speed. At the end of the calibration process, both pistons are in the opposite position to the initial position. The calibration device is preferably operated with air, which can be supplied with up to 6 bar. The EP gas bell pistons convince by highest measuring accuracy up to 0.15% (k=2).

Calibration equipment
  • primary standards for gases
  • calibration laboratories
  • volume flow


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