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