Envelope Surface Area Analyzer
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Description
PMI's Envelope Surface Area Analyzer (ESA) offers a simple, fast, and reliable technique for external surface area measurement - a measurement not readily achieved by static nitrogen adsorption (BET) methods. The ESA's innovative use of flow permeametry combined with its sophisticated self-adjusting viscous-flow controller enables testing of a wide range of powders and other samples, including materials with surface areas of only several square meters per gram.
Principles of Operation
The ESA operates on the principle of flow permeametry. By measuring the flow of Nitrogen (or any noncorrosive gas) through a sample at various differential pressures, one is able to deduct, through a series of equations, the external surface area of the sample.
Applications
Providing the user with a surface area measurement in less than five minutes, the main application of the ESA is quality control. Samples tested include pharmaceutical powders, electrode components, ceramic powders, fibrous materials, and other porous substances.
The ESA is utilized for this function in several industries, such as:
Learn about how the ESA determines the fastest technique for calculating envelope surface area and average particle size of ceramic powders.
For more information about applications please see our other technical papers.
Features
- Uses nitrogen or other noncorrosive gases; no expensive gas mixtures required
- Windows-based software handles all control, measurement, data collection, and report generation; manual control also possible
- Compatible with Windows 95 or higher
- Real-time graphical test display depicts testing status and results throughout operation
- Nondestructive testing
- Length of test approximately 5 minutes
- Wide range of acceptable sample types and sizes
- Minimal maintenance required
Specifications
For more information see our Envelope Surface Area Analyzer Brochure, Porometers Brochure, Permeameters Brochure, and Characterization of Pore Structure Brochure.