Spin riffling is the method of choice for sampling accuracy and reliability
of the highest order with dry materials. Gilson’s expertise in sampling and
analyses of powders and granular material is utilized to produce this nextgeneration
Spinning Riffler. The SP-230 features a custom designed touchscreen
controller/display, minimal moving parts and an outer case designed
for easy clean-up and maintenance. Operation is quieter and safer thanks
to an isolated motor and vibrator, automatic belt-drive system and sample
vessel enclosure. Both rotation speed and vibration level are displayed on
and precisely controlled from the touch screen.
The Gilson Spinning Riffler virtually eliminates operator error and bias associated
with other types of sample dividing. The accuracy of spin riffling
has been demonstrated in the 1968 M.Sc. thesis of A. A. Khan, Bradford
University. Sampling tests based on a 60/40% mixture of coarse and fine
sands produced the following comparisons:
A built-in vibratory feeder provides a constant flow of material from a stainless
steel hopper with 1L capacity. A durable urethane-based resin dividing
head sharply separates flowing material into as many as sixteen 60ml glass
sample vessels. Standard Tube vessels may be used, or vials with screwtop
caps in different sizes of amber or clear glass are available. The vials
enable freshly divided samples to be capped and stored immediately, with
minimal handling and little chance for contamination. Either type of vessel is
contained within the drum during operation to minimize exposure of moving
parts and contain spillage. The number of final fractions can be controlled
by simply leaving tubes or vials out of the drum. Excess material will then
flow directly into the drum. Rotation speed is continuously variable between
0—20rpm and the vibration amplitude of the feeder is variable as well. All
adjustments are controlled and displayed on the touch screen. The unique,
digitally controlled stepper motor turns a toothed belt and cogged drive
wheel. Speed control is very accurate with no slippage under normal loads.
A separate motor operates the vibratory feeder at 60Hz frequency and digitally
controlled variable amplitude. A “sleep” mode conserves power when
the unit is not operating. Main power supply voltage is automatically sensed,
allowing any AC input from 85—264V, and 47—63Hz single phase. A power
cord is supplied for use with standard North-American outlet configurations.
Power cords for other configurations are readily available locally.
The SP-230 includes a sixteen-port Dividing Head, a set of sixteen Standard
Tube Sample Vessels, a Sample Drum to contain the vessels and a
Holder Plate for positioning the vessels in the drum. All are listed below as
separate accessories for more efficient sample processing or as replacements.
Glass Sample Vials with threaded tops and included caps are also
available. Dimensions with Hopper in place: 13x20.5x23in (330x521x-
584mm), WxDxH. Est. Ship Wt.: 45lb (20kg).