The James A. Redding Company has designed and built over 200 three-stage sampling systems worldwide. We design and build each system to meet the specific needs of our clients.

A three-stage sampling system is the right choice when the quantity of the primary sample is too large for economical crushing, and an adequate final sample can not be obtained using a two-stage system.

How it works:
The cross-stream, Type C Baffle Plate primary sampler, extracts an increment from the falling coal stream, sending it to the cross-stream, Type C Baffle Plate secondary sampler, where the primary sample is resampled prior to crushing. Primary and secondary belt feeders meter and convey the sample at both stages. The crusher then reduces the secondary sample to the desired particle size.

The tertiary (after crushing) sampler extracts the final increment. The extracted sample is deposited into a single container or a pre-selected one on a multi-position sample collector. Sample rejects can be returned to the main material flow by a variety of methods.