INDEXING CONTROLLER SYSTEM AND METHOD OF AUTOMATIC CONTROL OF COOLING WATER TOWER SYSTEMS

摘要

ABSTRACT OF THE DISCLOSUREA control system and method of controlling the cycling ofwater in a cooling tower system having a course of make-up water ofvariable conductivity.The control system apparatus includes respective probes forsensing tower water conductivity and make-up water conductivity. Theprobes provide signals to a controller unit. Desired cooling systemwater conductivity parameters are input into the controller unit.The controller unit serves to proportionally adjust the trip point atwhich dumping of the cooling tower water occurs based upon the sensedwater conductivities and the input parameters to maintain a predeter-mined Langelier's number(s). Means are provided to display systemconditions and to effect calibrations of the system.The method entails establishing an indexing factor basedupon the cooling water parameters and the desired Langelier'snumber(s) and using that indexing factor for adjusting the trip point.