A method and apparatus for monitoring a liquid undergoing {HEAD ~ anaerobic fermentation} in {TAIL ~ a vessel} is disclosed 
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A method and apparatus for monitoring a liquid undergoing { HEAD ~ anaerobic fermentation } in { TAIL ~ a vessel } is disclosed
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH