Particle & Surface Sciences HPVA100/HPVA 200 series gas adsorption analysers

The HPVA100/HPVA 200 series gas adsorption analysers from Particulate Systems (a Micromeritics Brand) are designed to obtain high-pressure adsorption isotherms using gases such as hydrogen, methane and carbon dioxide using 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 analysed. When the sample reaches equilibrium with the adsorbate gas, the final equilibrium pressure is recorded. The data is then used to calculate the quantity of gas adsorbed by the sample. This process is repeated at given pressure intervals until the maximum preselected pressure is reached. Each of the resulting equilibrium points (volume adsorbed and equilibrium pressure) is then plotted to provide an isotherm.

Good reproducibility and accuracy are obtained by using separate transducers for dosing the sample and for monitoring the pressure in the sample chamber.

Features include: pressure ranges from vacuum to 200 bar; temperatures from cryogenic to 500°C; good control of sample temperature by means of a constant temperature bath; fully automated analysis and sample evacuation; good data reproducibility; handles typical adsorbates such as nitrogen, hydrogen, methane, argon, oxygen, carbon monoxide and carbon dioxide; comprehensive data analysis package using Microsoft Excel macros for data processing and graphing; software includes NIST RefProp Database 23; and solid-state pressure transducers with silicon element mounted to a Hastelloy isolation diaphragm with a high-integrity, glass-to-metal seal.