HPA Series
High Pressure Analyzers

The HPA Series are volumetric high pressure gas adsorption analyzers designed for the determination of equilibrium isotherms using the static volumetric method. This technique consists of dosing a known amount of gas (adsorbate) into the sample chamber. When the sample reaches equilibrium with the adsorbate gas the initial and final equilibrium pressures are recorded.  This data is then used to calculate the volume of gas adsorbed by the sample. The procedure is repeated at given pressure intervals until the maximum pressure, pre-selected by the operator, is reached. Each of the resulting equilibrium points (volume adsorbed and equilibrium pressure) is then plotted to provide an isotherm.  The HPA  Series are fully automated and integrated instruments capable of measuring isotherms at pressures up to 20 atmospheres (Model HPA 300), 33 atmospheres (Model HPA 500), and 69 atmospheres (Model HPA 1000) with a variety of adsorbate gases. Two instrument versions are available in each pressure range: single port versions include a built in outgassing station, and the four port version has a separate stand alone outgassing unit. The four port analyzes four samples simultaneously.