Logo of the Physikalisch-Technische Bundesanstalt
symbolic picture: "magazines"

Measuring even the smallest of flowrates

PTBnews 3.2020
Especially interesting for

testing laboratories

manufacturers of flowmeters

The optical inspection channel (yellow) allows the detection of the fluid level which arises around the vertical piston (gray).

To calibrate very small flowrates (< 0.1 ml/min), PTB is currently setting up a piston system to determine the volumetric flowrate. In this system, a liquid can be applied above the seal of the vertically moving piston with a low vapor pressure. The uncertainties normally inherent to this measurement process due to thermal inputs are minimized. An optical channel also allows leakages in the system to be detected via the detection of the liquid's level between two inspection windows.

(Technology Offer 499)


measuring even the smallest flowrates

reducing thermal inputs

detecting leakages

Contact person for questions about technology transfer