Facts & Figures Book - KPI-JCI

to the percentage settings at each station can be madequickly at the controller to maintain the product specification.The Spec-Select II (SSII) mode of operation is a dependentmethod of operation utilizing minimum and maximumtimer settings at each station to control the material discharge,and ensure that product specifications are meton a consistent basis. This system not only controls thedischarge valves at each station, but also controls all ofthe settling stations relative to each other. The minimumand maximum timer settings are determined by the gradationof the material settling out at each station and relatingthis to the product specification limits. In effect, the SSIImode of operation is making batches of specificationsand continuously. Each “A” or “B” valve at a given stationdischarges sand on a time basis between its minimumand maximum timer settings. No valve can begin a newbatch until every other valve has discharged at least itsminimum in the present batch being made. When a valvereaches its maximum timer setting and one or more ofthe other valves for that product have not yet met theirminimum settings, the controller automatically directs thematerial to one of the other product valves and flumes. Itis important to remember, in this mode of operation, thepotential to waste or to direct sand to a non-spec productwhere it is not desired is increased and should be carefullyconsidered when operating a tank by this method.This mode of operation is typically used when the feedgradation and/or feed rate vary widely.All currently manufactured models of Spec-SelectControllers are capable of operating in either the Spec-Select I or the Spec-Select II mode of operation.Washin g/Classifyin g125