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+27 (0) 11 954 1510



TriStar II


Surface Area and Porosity Instrument


Analytical Versatility/ High Throughput/ Small Footprint


The TriStar II is a fully automated, three-station, surface area and porosity analyzer that delivers high-quality data at an affordable price. The TriStar II also features a Krypton Option, allowing measurements in a very low surface area range.


A Small Footprint Packed with Features


  • Three analysis ports can operate simultaneously and independently of one another. Three BET surface area measurements can be performed in less than 20 minutes.
  • The TriStar II accommodates the use of nitrogen, argon, carbon dioxide, and other non-corrosive gases such as butane, methane, or other light hydrocarbons.
  • A dedicated Po port is standard, allowing the measurement of saturation pressure on a continuous basis. Saturation pressure can be entered manually, measured continuously, or collected over the sample.
  • Incremental or fixed dosing routines prevent overshooting pressure points while minimizing analysis time.
  • Free space can be measured, calculated, or manually entered providing maximum flexibility in accommodating special sample types and emphasizing speed when needed. Helium is not required.
  • The TriStar II can collect up to 1000 data points. Fine details of the isotherm can be observed and recorded providing high resolution and revealing pore structure details.
  • Optional sample preparation devices are available combining flowing gas and/or vacuum with heat to remove atmospheric contaminants, such as water vapor and adsorbed gas, from the surface and pores of the sample.


Low Surface Area Measurement Option


A Krypton Option can extend surface area measurements to as low as 0.001 m2/g.



Operating Software


The TriStar II Windows interface provides a familiar environment for the user. It is easy to collect, organize, archive, reduce isotherm data, and store standardized sample information for later use. The reports may be generated to screen, paper, or spreadsheet file. Cut-and-paste graphics, scalable and editable graphs, and customized reports are easily generated.


In addition to controlling instrument operation, the Windows software also reduces the isotherm data collected during analysis. The reduced data can be reviewed or printed in a variety of easy-to- interpret tabular and graphical reports.

Tabular and Graphic Reports:

  • Dollimore-Heal adsorption and desorption
  • Mesopore
  • Volume and area distributions by pore size
  • MP-Method
  • HK
  • Saito-Foley
  • Chang-Yang
  • DFT pore size
  • DFT surface energy
  • Summary Report
  • SPC reports
  • Validation reports
  • Single and multipoint BET surface area
  • Total pore volume
  • Langmuir surface area and Isotherm reports
  • t-plot
  • Harkins and Jura Thickness Equation
  • Halsey Thickness Equation
  • Carbon STSA
  • Broekhoff-de Boer
  • Kruk-Jaroniec-Sayari
  • BJH adsorption and desorption
  • Standard
  • Kruk-Jaroniec-Sayari correction

External Sample Preparation Devices

The FlowPrep™ 060


The FlowPrep™ 060 applies both heat and a stream of inert gas to the sample. The heat causes contaminants to desorb from the surface and the stream of inert gas sweeps them out of the sample tube. It lets you choose the temperature, gas, and flow rate best suited for your sample material and application. Needle valves allow you to introduce the flowing gas slowly to prevent fluidization of samples.

SmartPrep™ 065


The SmartPrep™ 065 is a flowing-gas degassing unit which removes adsorbed contaminants from the surface and pores of a sample in preparation for analysis. It contains six sample ports, each one independently temperature-controlled for greater flexibility. It contains two serial ports, one for connecting to the computer and the other available for connection of an additional SmartPrep. The temperature, ramp rates, and soak times of each sample are individually controlled by the computer. Up to five ramps and soaks are allowed. All degas information is integrated into the sample data file for future reference.

The VacPrep™ 061


The VacPrep™ 061 offers two methods for removing contaminants. In addition to flowing gas, it provides vacuum to prepare samples by heating and evacuation. This combination allows you to choose the preparation method that is best suited to your material or application. The VacPrep features six degassing stations, and a choice of vacuum or gas flow preparation on each of the six stations. Needle valves are also provided allowing you to introduce the flowing gas or vacuum slowly to prevent fluidization of samples.

Smart VacPrep™ 067


The Smart VacPrep™ is an advanced six-port system that utilizes vacuum to prepare samples by heating and evacuation. Each of the ports may be operated independently. Samples may be added or removed from degas ports without disturbing the treatment of other samples undergoing preparation. Degassing automatically terminates when the samples have completed all programmed steps.

TriStar II Plus


Micromeritics' TriStar II Plus is a state-of-the-art instrument suited for use in both quality control and research environments. Intended for laboratories that require high throughput and the highest quality data, it contains all the capabilities of the TriStar II with additional hardware and software features.


Surface Area and Porosity Instrument

Analytical Versatility/ High Throughput/Small Footprint


The TriStar II Plus is a an automated, three-station, surface area and porosity analyzer that delivers excellent performance and speed of analysis. With three available analysis ports, the TriStar II Plus provides high sample through-put and advanced data analysis features to the user. The unique stainless steel analysis manifold is corrosive resistant and designed for highly accurate gas management for confident and repeatable results.

Advanced Hardware and Software Features


  • The unique stainless steel analysis manifold is corrosive resistant and designed for highlyaccurate gas management
  • Improved Dewar design provides more than 40 hours of continuous temperature control
  • Intuitive MicroActive software gives the user the ability to interactively evaluate isotherm data and reduces the time required to obtain surface area and porosity results
  • User-defined reporting options allow direct modeling
  • Powerful Python scripting language allows users to develop extensions to the standard report library available within the TriStar II Plus software application
  • An innovative dashboard monitors and provides convenient access to real-time instrument performance indicators and maintenance scheduling information
  • Capable of utilizing two isotherms (CO2 and N2) for calculating pore size diameter via NLDFT for micropore analyses of carbons

Data Reduction Benefits


  • Interaction with adsorption data is direct. By simply moving the calculation bars, the user is immediately updated with new textual properties. One-click access to important parameters allows the user to focus on the result rather than the parameters
  • Interactive data manipulation minimizes the use of dialog boxes and tunneling of dialogs to specify calculation parameters. This allows the user to accurately and efficiently determine surface area and porosity of their materials
  • Improved ability to overlay files (up to 25) including mercury intrusion data with a file add and subtract feature
  • User selectable data ranges through the graphic interface allows direct modeling for BET, t-Plot, Langmuir, DFT interpretation, and much more
  • Report Options editor allows the user to define up to five reports with on-screen previews. Each report has the ability to possess multiple summary, tabular, and graphical information panes


Low Surface Area Measurement Option


A Krypton Option can extend surface area measurements to as low as 0.001 m2/g.


Enhanced Software Capability & Instrument Monitoring


The intuitive MicroActive for TriStar II Plus software gives the user the ability to interactively evaluate isotherm data and reduce the time required to obtain surface area and porosity results. It is not necessary to generate reports to view results.


Calculations, such as the BET surface area transform plot, can be easily generated and adjusted. The selection bars allow for a range of data points to be quickly and easily selected. As a result, the summary of values derived from the calculations is instantly updated. Within the calculation window(s), the range of data used can be further refined.

The Dual DFT

This advanced NLDFT method allows users to determine the pore size distribution of their sample using two isotherms. In this example CO2 adsorption (red) at 273 K and nitrogen adsorption (green) at 77 K are used to calculate a single pore size distribution. Users do not have to cut and paste distributions from CO2 and nitrogen - a single distribution is determined using both isotherms.

Extended Pore Range Analysis


The Dual DFT NLDFT model allows the user to combine the information gathered from nitrogen and carbon dioxide isotherms to deliver a full pore size distribution on materials (such as carbon slit pores) where pores of molecular sizes are present. The range of pore size analysis in this method is extended to smaller pore sizes compared to the standard nitrogen analysis. This is due to the fact that CO2 can access some very small micropores that are not accessible to N2 at cryogenic temperatures due to size restrictions, connectivity problems, or extremely slow diffusion.

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