Micromeritics TriStar II Plus Surface Area & Porosity Analyser

TriStar II Plus is a an automated, three-station, surface area and porosity analyser that delivers excellent repeatability and speed of analysis.

Micromeritics TriStar II Plus Surface Area & Porosity Analyser

TriStar II Plus is a an automated, three-station, surface area and porosity analyser that delivers excellent repeatability and speed of analysis.

Manufacturer Micromeritics
Product Series Micromeritics TriStar
Measurement principle Physisorption
Application Surface Area & Porosity
Pressure measurement range0 to 950 mmHg (Resolution 0.05 mmHg, Accuracy 0.1%)
Specific Surface AreaFrom 0.01 m²/g, Nitrogen, 0.001 m²/g, Krypton
Pore VolumeFrom 4 × 10-6 cm³/g
Dewar DurationUp to 40 hours

Product Overview

Micromeritics TriStar II Plus provides fully automated surface area and porosity measurements on solid materials by using the technique of gas adsorption. This easy-to-operate, tabletop instrument is designed to analyse up to three samples simultaneously for optimum throughput. The instrument features a Krypton option, allowing measurements in the very low surface area range, as low as 0.001 m2/g. Its speed and accuracy make it an ideal instrument for a wide variety of applications that include pharmaceuticals, catalysts, carbon, cosmetics, paints, pigments, geoscience, fuel cells, high-tech ceramics and much more.

The unique stainless steel analysis manifold is corrosive resistant and designed for highly-accurate gas management while the 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. Powerful Python scripting language allows users to develop extensions to the standard report library.

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  • High Throughput, Small Footprint

Three BET surface area measurements can be performed in less than 20 minutes.  Three analysis ports can operate simultaneously and independently of one another and up to 4 TriStars can be operated with one computer.

  • Low Surface Area measurement

Surface areas as low as 0.01 m2/g can be measured with the standard nitrogen system. A krypton option can extend surface area measurements to as low as 0.001 m2/g. A dedicated Po port is standard, allowing the measurement of saturation pressure on a continuous basis.

  • Maximum flexibility and speed

Incremental or fixed dosing routines prevent overshooting pressure points while minimising analysis time. A 2.75-liter Dewar and extended length sample tubes allow complete adsorption and desorption isotherms to be collected without operator intervention.

  • Intuitive and powerful Windows based software

The most powerful features of this software are found in its expanded range of data reduction and reporting. SPC reports, new isotherm and thickness models, isosteric heat of adsorption, and integrated DFT models are all included.



Surface area and porosity play major roles in the purification, processing, blending, tableting, and packaging of pharmaceutical products as well as their useful shelf life, dissolution rate, and bioavailability.


Surface area and porosity affect the curing and bonding of greenware and influence strength, texture, appearance, and density of finished goods. The surface area of glazes and glass frits affects shrinkage, crazing, and crawling.


Knowledge of surface area, total pore volume, and pore size distribution is important for quality control of industrial adsorbents and in the development of separation processes. Surface area and porosity characteristics affect the selectivity of an adsorbent.

Activated Carbons

Surface area and porosity must be optimised within narrow ranges to accomplish gasoline vapour recovery in automobiles, solvent recovery in painting operations, or pollution controls in wastewater management.

Carbon Black

The wear lifetime, traction and performance of tires are related to the surface area of carbon blacks used in their production.


The active surface area and pore structure of catalysts influence production rates. Limiting the pore size allows only molecules of desired sizes to enter and exit, creating a selective catalyst that will produce primarily the desired product.

Paints and Coatings

The surface area of a pigment or filler influences the gloss, texture, color, color saturation, brightness, solids content, and film adhesion properties. The porosity of a print media coating is important in offset printing where it affects blistering, ink receptivity, and ink holdout.

Projectile Propellant

The burn rate of propellants is a function of surface area. Too high a rate can be dangerous; too low a rate can cause malfunction and inaccuracy.

Medical Implants

Controlling the porosity of artificial bone allows it to imitate real bone that the body will accept and allow tissue to be grown around it.


By selecting high surface area material with carefully designed pore networks, manufacturers of supercapacitors can minimize the use of costly raw materials while providing more exposed surface area for storage of charge.


Surface area is often used by cosmetic manufacturers as a predictor of particle size when agglomeration tendencies of the fine powders make analysis with a particle-sizing instrument difficult.


Surface area and porosity of heat shields and insulating materials affect weight and function.


Porosity is important in groundwater hydrology and petroleum exploration because it relates to the quantity of fluid that a structure can contain as well as how much effort will be required to extract it.


Nanotube surface area and microporosity are used to predict the capacity of a material to store hydrogen.

Fuel Cells

Fuel cell electrodes require high surface area with controlled porosity to produce optimum power density.


A variety of sample preparation devices are available to prepare batches of samples for surface area and pore volume analysis. They combine 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.


FlowPrep 060 applies both heat and a stream of inert gas to the sample for removal of adsorbed contaminants from the surface and pores. With six degassing stations, this sample preparation unit lets you choose the temperature, gas, and flow rate.

VacPrep 061 offers two methods for removing adsorbed contaminants. In addition to flowing gas, this sample preparation unit provides vacuum to prepare samples by heating and evacuation.

SmartPrep 065 applies a stream of flowing gas over the sample at elevated temperatures to remove adsorbed contaminants. Temperature, ramp rates, and soak times of each sample are individually controlled on the six degas- sing stations by a computer.

Smart VacPrep 067 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.

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