Air Pycnometer According to Langer

Air pycnometer according to Langer, complete set including a calibration block. The apparatus is suited for sample rings with a maximum diameter of 53 or 60 mm (max. height 51 resp. 40 mm) and has a measuring range of 0-115 cm3.
Determine the volumes of soil, water and air
Easy, quick and accurate way to determine volumes
Based on use of volumetric soil sample rings
Can be used for non-porous materials as well
Simple calibrations
Use of soil sample rings is not required
 
Description
The vacuum air pycnometer has been designed to determine the volume and density of solid material, such as soil samples. It can be applied in every field where it's important to calculate a specific weight, such as soil research, powder- and granulate investigations for the pharmaceutic industry, road building, brick factories, and the food industry (coffee, leguminous plants, etc.). The apparatus is especially useful to measure the volumes of irregularly shaped objects.
The principle
An under pressure is created in the vacuum bell that the object to be measured is placed in. Depending on the gas volume present in the bell, more or less air will be extracted. The quantity of the air present is independent of the volume taken by the object to be measured. After the under pressure has stabilised, the volume of the object can be read from the calibrated scale.
Remarks
Uses mercury (enclosed)
Applications
The pycnometer can be applied wherever knowing a specific weight is desired:
In soil research, such as the determination of the porosity of soil samples. It is recommended to use soil sampling rings with a 100 cc contents when taking undisturbed soil samples.
Powder- and granulate research in the pharmaceutical industry
Measuring the pore volume of tarmac (road construction) or clay and bricks (brickworks)
Volume determinations of seeds, coffee beans, legumes, etc. in the food industry
Laboratory soil density measurements
Limitation: Temperature variations influence the measurements (can be prevented by climate control in the laboratory).