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Equipment Description HPVA Series Operator’s Manual
1-2 Mar 2011
Equipment Description

The High Pressure Volumetric Analyzer (HPVA) from Particulate Systems is designed to obtain high-
pressure adsorption isotherms using gases such as hydrogen, methane, and carbon dioxide employing
the static volumetric method. The volumetric technique consists of introducing (dosing) a known
amount of gas (adsorptive) into the chamber containing the sample to be analyzed.When the sample
reaches equilibrium with the adsorbate gas, the final equilibrium pressure is recorded. These data are
then used to calculate the quantity of gas adsorbed by the sample. This process is repeated at given
pressure intervals until the maximum pre-selected pressure is reached. Each of the resulting equilib-
rium points (volume adsorbed and equilibrium pressure) is then plotted to provide an isotherm.
Excellent reproducibility and accuracy are obtained by using separate transducers for dosing the sam-
ple and for monitoring the pressure
in the sample chamber.
The HPVA Series of analyzers includes two models: the HPVA-100, capable of achieving pressures up
to 100 bar and the HPVA-200, capable of achieving pressures up to 200 bar.
The HPVA Analyzer includes a separate degas port for drying the sample before testing. The furnace is
capable of temperatures up to 500 °C, controlled with a routine which includes ramp and soak
capabilities.