Product Information

Air pyknometer

The air pycnometer is an innovative measurement instrument to determine the pore volume of a substrate sample in the laboratory. It is suitable both for undisturbed soil samples as well as for bulk goods such as sands, gravelsor plant granulate. The measurement chamber is permanently connected to the basic body and is sealed by a lid which is held in place by a bar. A soil sample ring is not essential to conduct the measurement. Due to the large measurement chamber with a volume of 2120 cm³, appropriately large samples may also be examined which increases the accuracy of the measurement and makes a few of the investigations at all possible. .
The design of this instrument is based on the guidelines of the FLL (Forschungsgesellschaft Landschaftsentwicklung und Landschaftsbau). The measurement principle is based on the isothermal gas expansion experiment according to BOYLE-MARIOTTE. An additional volume of a known size is filled with compressed air, connected to the measurement chamber of known size with substrates sample and a pressure equilibrium achieved. The compensating pressure is a measurement of the air filled pore volume because only the solids volume within the measurement chamber serves to push out gas. The pressure values are displayed by a digital manometer in a freely selectable pressure unit. The integrated compressor renders additional devices or gas flasks superfluous as long as air is used as measurement gas. As an option, a different measurement gas may be used via a separate feed lin.



  • Investigation of large samples possible due to large measurement chamber
  • No soil sample ring necessary
  • No additional devices necessary

Technical Specifications

Technical Specifications

Measurement chamber: V ≈ 2120 cm³
h =12 cm
Ø =15 cm
Measurement range for digitalmanometer:-1 … 3 bar
Resolution of digital manometer:1 mbar



Order Numbers + Accessories


Ordering Details:

Art.-Nr.:  148000   Air pycnometer


Tel.: +49 (0) 33432 - 89 575
Fax: +49 (0) 33432 - 89 573

Niederlassung Süd
Tel.: +49 (0) 8161 - 23 46 441
Fax: +49 (0) 8161 - 23 46 443