In larger installations {HEAD ~ a signal output} from {TAIL ~ 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 
from
In larger installations { HEAD ~ a signal output } from { TAIL ~ 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
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL 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 OTH OTH OTH OTH OTH OTH OTH