HPVA II - High Pressure Volumetric Analyzer

HPVA II - High Pressure Volumetric Analyzer

HPVA II - High Pressure Volumetric Analyzer

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High Pressure Specialty Applications:

The HPVA II Series of adsorption analyzers from Particulate Systems uses the static volumetric method to obtain high-pressure adsorption and desorption isotherms utilizing gases such as hydrogen, methane, and carbon dioxide.

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 preselected pressure is reached. Then the pressure can be decreased to provide a desorption isotherm. Each of the resulting equilibrium points (volume adsorbed and equilibrium pressure) is plotted to provide an isotherm.

Excellent reproducibility and accuracy are obtained by using separate transducers for monitoring low and high pressures.


System Overview


Typical Applications


Supplemental Reporting

Instrument and Accessory Ordering Information


  • Wide Operating Pressure range: High Vacuum to 100 or 200 bar

  • Broad Temperature Capability: From cryogenic to 500 °C

  • Excellent control of sample temperature by means of a recirculating temperature bath, cryogen dewar, or furnace

  • Manifold temperature controlled with heater for stability and accuracy 

  • Fully automated analysis using interactive software

  • Excellent data reproducibility 

  • Handles typical adsorbates such as nitrogen, hydrogen, methane, argon, oxygen, and carbon dioxide 

  • Comprehensive Data Analysis package using Microsoft Excel macros for data processing and graphing

  • Software includes NIST REFPROP

Now available with 4 ports -
HPVA 4 Port Series Instrument Flyer

Solutions for the Evaluation of
Unconventional Gas Reservoirs


 Dual free-space measurement for accurate isotherm data

Free space can be measured or entered

  Correction for non-ideality of analysis gas using NIST REFPROP compressibility factors calculated from multiple equations of state

 Reports provided as interactive spreadsheets  

  Isotherm and weight percentage plots created automatically

  Real-time charts for Pressure vs. Time and Temperature vs. Time 

  Gas mixtures with up to three components can be used

  Kinetic data provided for rate of adsorpotion calculations 

  Langmuir equation used to model Type I isotherms

  High-precision, solid-state design high-pressure transducer provides a reading accuracy of ±0.04% full scale with a stablility of ±0.1% 

  System can attain a maximum pressure of 200 bar

  Hydrogen gas sensor automatically shuts down the system should a hydrogen leak occur 

  BET surface area, Langmuir surface area, and total pore volume calculations included 


Application Note:

 Google Scholar search: HPVA II

Contact Information:

Patrick Wommack  
General Manager
Office: 770.662.3681
Cell: 404.229.8384 
U.S. Sales: