Micromeritics Gemini VII 2390a, Operator'S Manual

Page: 16 / 426

Equipment Description Gemini VII
1-4 239-42828-01 - Dec 2012
The Gemini VII Series analyzers are easy to use, fully automatic, and provide single and multipoint
surface area and pore size measurements. Three models are available: the Gemini 2390
a
, 2390
p
, and
2390
t
.
The Gemini 2390
a
and 2390
p
are enclosed in the same size cabinet. The only physical difference is the
Po (saturation pressure) tube which is installed on the Gemini 2390
p
, allowing continuous measure-
ment of the saturation pressure.
The Gemini 2390
t
is in a slightly larger cabinet allowing the use of a larger Dewar and longer sample
tubes for extended analyses. This model also is equipped with a Po tube.
Most features are available on all three models, with the exception of a continuous Po measurement
and some reports. Refer to the following table for a brief summary of some of the model reports and
features.
The basic function of the Gemini analyzers is to determine the surface area of solid materials. Analyses
are performed using a static volumetric technique in which the adsorptive flows into a tube containing
the sample and into a balance tube simultaneously. The internal volume and the temperature surround-
ing both tubes are maintained at identical conditions. The only difference is the presence of the sample
in the sample tube.
Feature 2390a 2390p 2390t
Single and multipoint BET surface area   
Langmuir surface area
  
Automatically generated pressure tables with user-selected points   
Total pore volume
  
t-Plot method micropore volume and area   
Analysis log
  
Statistical Process Control (SPC) reports   
Horvath-Kawazoe data reduction
  
BJH pore size distribution using adsorption isotherm  
BJH pore size distribution using desorption isotherm

Continuous measurement of saturation pressure (Po)  
Dubinin reports
  