AMI
Meso 112/222

Gas Adsorption Analyser

Available with 2 analysis ports, each with in-situ degassing capability.
Simultaneously analyze different adsorbate gases across up to 2 stations.
Each port features an independent gas inlet (excluding Meso 112 model).

The AMI-Meso 112/222 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.

Key Features

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.

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.

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.

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 four in-situ degassing ports, enabling simultaneous degassing and analysis. Each port offers independent temperature control from ambient to 400°C, ensuring precise sample preparation.

Software

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, optimising 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 analyser 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

Technical Specs

Analysis Ports	AMI-Meso 112 2 and AMI-Meso 222 2
P0 Transducer	AMI-Meso 112 2 and AMI-Meso 222 2
Analysis Pressure Transducer	AMI-Meso 112 1 and AMI-Meso 222 2
Accuracy (PTs)	1000 Torr Accuracy: 0.05% F.S., Resolution: 0.0005% F.S.
Pump	1 mechanical pump (ultimate vacuum 10-1 Pa; minimal 7.5 x 10-4 torr
P/P0 Range	10⁻⁴ – 0.998
Specific Surface Area	≥ 0.01 m2/g, test repeatability: RSD ≤ 1.0%
Pore Size Range	.35-500 nm, test repeatability: ≤ ±0.02 nm (Achieved with CO2)
Pore Volume	≥ 0.0001 cm³/g
Degassing Ports	2 in-situ
*Adsorbates	N₂, CO₂, Ar, Kr, H₂, O₂, CO, CH₄, 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, max power 300 W