Micromeritics Subsieve AutoSizer (SAS)

Micromeritics Limited Subsieve AutoSizer (SAS)

Developed as a direct and improved successor to the widely used Fisher Model 95 Sub-Sieve Sizer (FSSS), The Micromeritics SAS has improved the FSSS’s performance by offering easy-to-use automated functions together with electronically recorded data.

The SAS is designed to generate “Fisher number” results identical to that of its predecessor (the Fisher FSSS). This is a crucial point, as the air permeability technique and the FSSS have been used as a benchmark for decades in many industries. Many applications use historical data and quality control standards, and a modern source of comparable, repeatable results is necessary.



What is Air-permeability Particle Sizing?

The air-permeability technique is well established for measurement of the Specific Surface Area (SSA) of a sample powder. The SSA measured by this technique has been found to be a useful parameter in various industries such as pharmaceutical, metal coatings, paints, and even geological samples.
The SAS utilizes dual pressure transducers to measure pressure drop across a packed bed of powder. By varying the sample height and porosity while controlling the flow rate of air through the sample, the SSA and average particle size can be determined using the Kozeny-Carman equation.

Features / Benefits:

Superior Software - sets a world-wide standard for instrument operation, data acquisition and handling, reporting and systems integration.  

ASTM Approval - Fully compliant with ASTM B330-12 and C721-14 standards for particle sizing of alumina, silica, and metal powders and related compounds. Fully compliant with ASTM B330-12 and C721-14 standards for particle sizing of alumina, silica, and metal powders and related compounds

Quick and Easy Set-up - Simple step by step set-up, easy to follow; ensuring that no parameters are over looked

Fully Automated Analysis - Sample compaction and pressure stability are computer controlled for high repeatability

Real Time Data Display - Data can be viewed as it is acquired simplifying method development Report Generation - Automatically creates PDF reports with custom company logos and typestyles
Fisher Mapping -
Optimizes data agreement with
customizable Fisher correlation
Security Features - Optional Password Protection ties samples to user ID’s and protects configuration parameters plans from unauthorised changes


Click here for a larger view of above diagram      

Comparison trials between the Micromeritics SAS and Fisher FSSS have been carried out using a variety of samples. The graphs above compare the mean particle size data from the two instruments on powders of different sizes. One plot is based on results for inorganic (mainly tungsten) metal; the second on organic samples (mostly pharmaceuticals). There is exceptional correlation between the two sets of data. Numerous extensive studies have come to the same conclusion

Micromeritics Subsieve AutoSizer Brochure »

Consumables and Accessories Ordering Information »

Operator Manual »

Paper: "Air Permeability: A New (Old) Technique for Particle Size Measurements »


55 cm (21.7 in)
50 cm (19.7 in)
38 cm (15 in)

28 kg (61.7 lb)
Voltage: 120 - 240 VAC
Frequency: 50 - 60 Hz
Current: 1A

0.5–75 micron

Contact Information:

Patrick Wommack
General Manager
Office: 770.662.3681
Cell: 404.229.8384
U.S. Sales: