The attached document outlines the terminals and functions of the previous models (ATC880/770) and cross references them with our current controller (ATC990). We hope that this resource tool makes instrument replacement easier, and reduces your down time from production.
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ATC990 Process Controller and UPR900 Process Indicator Technical Notes, Applications and Setup
It has long been known that pressure instability for polymer melt entering the die usually results directly in ouput variation. Instrumentation used in these early studies was too delicate and expensive to be practical for routine commercial use. An excellent article written by B. H. Maddock, covering some of his early studies is title “Measurement and Analysis of Extruder Stability.”
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