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