Accordingly, a particular form of proportional control is achieved by the on off controller in that the secondary valve opens for a period of time within the cycle period which is proportional to {HEAD ~ the reactor pressure deviation} from {TAIL ~ the second set point} 
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Accordingly , a particular form of proportional control is achieved by the on off controller in that the secondary valve opens for a period of time within the cycle period which is proportional to { HEAD ~ the reactor pressure deviation } from { TAIL ~ the second set point }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL