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