In larger installations {HEAD ~ a signal output} from an oxygen analyzer 9 feeds into {TAIL ~ controller} 5 to automatically adjust the ratio of reducing agent to adjust for any variation in oxygen content of the water being treated 
feeds into
In larger installations { HEAD ~ a signal output } from an oxygen analyzer 9 feeds into { TAIL ~ controller } 5 to automatically adjust the ratio of reducing agent to adjust for any variation in oxygen content of the water being treated
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH