Gilson Company, Inc.
GilSonic AutoSiever: GA-6
Page 3
GilSonic AutoSiever
pulses per minute. Addition of tapping actions helps clear
blinding of near-sized particles and assists in deagglomerating
samples with electrostatic, hygroscopic, or other adhesion
problems.
The AutoSiever's control panel and ten program memory help
insure exact repeatability of sequences of time and vibration
amplitude, plus user-selection of vertical and horizontal tapping.
Desired maximum amplitude is determined in manual mode by
viewing the action of the largest particles in each sample type.
Each program has timed segments for buildup to desired
maximum amplitude (Time A), hold time at maximum (Time B),
then down-ramp to zero (Time C). Amplitude is displayed on
a 0-99 digital LED scale. Programs vary with sample types and
particle size range. Once in memory, the test sequences can
be rerun on demand to repeat testing of similar samples. All
switch setting as well as time-amplitude sequences are stored
for each of ten program memory slots where they are available
for instant recall and use without resetting any controls.
GA-6 Sonic Sieving Action
Flexible
Diaphragm
Sieves
Flexible Wall
Fines Collector
1.1 Sonic Sieving to 5µm with 3in Sieves
Useful Range with most Powders
•
Wire-woven sieves from No.20 (850µm) to No.635 (20µm)
or precision electroform nickel mesh 150µm to 5µm.
•
Electroformed mesh sizes of 150µm and larger are available
for ±2µm precision when needed.
•
Larger wire-woven sieves from No.3-1/2 to No.20 are avail-
able for low density materials.
All sieves employ clear acrylic frames to allow viewing of the
sieving process.
1.2 Unique Features
• Electronic controls give exact repeatability of programmed
time and amplitude sequences.
• Amplitude may be set precisely with a digital LED
0-99 even-increment scale. Memory stores up to 10 pro-
grams with instant recall.
• Built-in vertical or alternating vertical and horizontal tap-
ping helps clear sieves and deagglomerate samples.
• Large digital LED display and 8 LED mode indicators tell
operator at a glance the mode or function in progress.
NOTE: Test times vary with size, density, texture, and
quantity of samples. Five minutes is typical, but sieving
time can be as little as 30 seconds under favorable condi-
tions.
1.3 How It Works
The AutoSiever is designed to automatically take full advantage
of the unique capabilities of sonic sieving. Intensity of sieving
action is varied by changing the amplitude of sonic pulses.
Sonic sieving uses a vertically oscillating air column to lift
particles, then carry them back against mesh openings at 3,600
1.0 INTRODUCTION
The speed and accuracy of sonic sieving coupled with microprocessor control make
the AutoSiever the ultimate instrument for laboratory sieving as fine as 5µm.
Figure 1.3
