Meso 112/222

INTRODUCTION

The AMI-Meso112/222 Series is engineered for high-precision surface area and pore size characterization of powdered materials. This series comprises two models, Meso 112 and Meso 222, both integrated with 1000 Torr pressure transducers at each analysis station for accurate BET surface area determination and mesopore size distribution analysis.
Each analysis port is equipped with an in-situ degassing module capable of heating samples up to 400°C, ensuring efficient removal of adsorbed contaminants prior to analysis. This in-situ degassing eliminates the risk of contamination associated with sample transfer. Additionally, when multiple stations are utilized, each operates independently, allowing for simultaneous yet discrete analyses of different samples.

Module Design for Minimal Dead Volume
The internal gas path design of the instrument adopts a unique integrated metal module design, which not only reduces the internal dead volume spacebut also helps mitigate possible leaks.
Saturated Vapor Pressure P0
An independent P₀ pressure transducer is configured at 133 kPa for P₀ value testing,enabling real-time P/P₀ measurement for more accurate and reliable test data. Alternatively, an atmospheric pressure input method can be used to determine P₀.
Independent analysis ports
With independent analysis ports, the system employs a unique vacuum control logic that allows each station to operate without disruption, even when using a single mechanical pump or pump group.This enables simultaneous, independent experiments, meeting diverse adsorbent testing needs while ensuring high efficiency.
Liquid Nitrogen Dewar
The use of 1 L Dewar flasks in conjunction with a sealed cover ensures a stable thermal profile along the entire length of both the sample tubes and P₀ tubes throughout the testing process.
Sample Preparation
Equipped with two in-situ degassing ports, enabling simultaneous degassing and analysis. Each port offers independent temperature control from ambient to 400°C, ensuring precise sample preparation.

High Accuracy Pressure Transducers
Equipped with 1000 Torr pressure transducers, the Meso Series enables precise physical adsorption analysis, achieving a partial pressure (P/P₀) as low as 10 -² for nitrogen (N₂) at 77 K.
Optimized Manifold Contamination Control
This system features a multi-channel, adjustable, and parallel vacuum design with segmented vacuum control. This setup effectively prevents samples from being drawn up into the analyzer therefore preventing manifold contamination.
Thermal Stabilization
A core rod in the sample tube reduces deadvolume and stabilizes the cold free space coefficient, while an iso-thermal jacket maintains a constant thermal profile along the tube. Additionally, automatic helium correction ensures precise calibration for any powder or particulate material, minimizing temperature- related deviations during analysis.

PAS Software is an intelligent solution for operation control, data acquisition, calculation, analysis, and report generation on the Windows platform. It communicates with the host via the LAN port and can remotely control multiple instruments simultaneously.

PAS Software adopts a unique intake control method, optimizing pressure in the adsorption and desorption processes through a six-stage setting, which improves testing efficiency.
Changes in pressure and temperature inside the manifold can be directly observed in the test interface, providing convenience for sample testing and instrument maintenance. The current state of analyzer can be intuitively understood with the indicator light and event bar.

Each adsorption equilibrium process is dynamically displayed on the test interface. Adsorption characteristics of the sample can be easily understood.
A clear and concise report setting interface, including the following:
Adsorption and desorption isotherms
Single-/Multipoint BET surface area
Langmuir surface area
STSA-surface area
Pore size distribution according to BJH
T-plot
Dubinin-Radushkevich
Horvath-Kawazoe
Saito-Foley

The specific surface area test results of iron ore powder are presented in the figure below. As a material with very small specific surface area, the repeatability error is only 0.0015 m²/g in the test results.

Analysis value of pore size distribution in activated carbon materials as follows:

Model	AMI-Meso 112	AMI-Meso 222
Analysis Ports	2	2
P₀ Transducer	2	2
AnalysisPressure Transducer	1	2
Accuracy PTs	1000 torr
Pump	1 Mechanical pump (ultimate vacuum 10^-2 Pa);
P/P₀	10^-4- 0.998
Surface Area	≥ 0.0005 m²/g, test repeatability: RSD ≤ 1.0%
Pore Size	0.35-500 nm, test repeatability: ≤0.2 nm
Pore Volume	≥ 0.0001 cm³/g
Degassing Ports	2 in-situ
Adsorbates	N₂, CO₂, Ar, Kr, H₂, O₂, CO, CH₂, etc.
Cold Trap	1
Volume and Weight	L 34.5 in (870 mm) × W 22.5 in (570 mm) × H 35.0 in (890 mm), 188 lbs (85 kg)
Power Requirements	110 or 200-240 VAC, 50/60 Hz, maximum power 300 W

Applied Field	Typical Materials	Details
Material Research	Ceramic powder, metal powder, nanotube	According to surface area value of nanotube, hydrogen storage capacity can be predicted.
Chemical Engineering	Carbon black, amorphous silica, zinc oxide, titanium dioxide	Introduction of carbon black in rubber matrix can improve mechanical properties of rubber products. Surface area of carbon black is one of the important factors affecting the reinforcement performance of rubber products.
New Energy	Lithium cobalt, lithium manganate	Increasing surface area of electrode can improve Electrochemical reaction rate and promote iron exchange in negative electrode.
Catalytic Technologies	Active alumina oxide, molecular sieve, zeolite	Active surface area and pore structure influence reaction rate.

TEL: +1 262-877-3600

EMAIL：sales@ami-instruments.com