The system controller can be coupled to various sensing devices to monitor certain variables or physical phenomena, process the variables, and output control signals to control {TAIL ~ devices} to take necessary actions when {HEAD ~ the variable levels} exceed or drop below selected or predetermined values 
The system controller can be coupled to various sensing devices to monitor certain variables or physical phenomena , process the variables , and output control signals to control { TAIL ~ devices } to take necessary actions when { HEAD ~ the variable levels } exceed or drop below selected or predetermined values
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