Spinning Riffler; Chute Splitter - Beckman Coulter LS 13 320 User Manual

Sample Handling
Material Handling
A representative sample can be obtained by implementing one of the five common sampling
procedures. The five procedures are listed in descending order with respect to their efficiency at
getting good sample representation.

Spinning Riffler

The spinning riffler consists of a rotary sample tray, hopper, and a vibratory feeder. The sample fills
the mass flow hopper without heaping in piles and falls from the hopper to the chute of the
vibratory feeder. The feeder supplies a constant flow rate to the collection boxes, which move in a
circular motion.This method, according to statistics, yields the most accurate results. It is
recommended that samples be subdivided to the amount of a gram and the sample must be free
flowing.
Figure B.1 Figure 1. Spinning Riffler

Chute splitter

The sample is placed in a V-shaped hopper and migrates down a series of chutes that alternately
feed two trays placed on either side of the trough. The sample is poured into the hopper and
repeatedly halved until a desired sample amount is obtained. Satisfactory sample division can be
obtained only if the operator loads the sample into the trough carefully without segregation
occurring.
B-2 PN B05577AC