More specifically, the present invention drives {HEAD ~ a wide range electrochemical polarographic oxygen sensor} under {TAIL ~ a drive voltage} designed to maintain the sensor in the current limiting range of operation 
under
More specifically , the present invention drives { HEAD ~ a wide range electrochemical polarographic oxygen sensor } under { TAIL ~ a drive voltage } designed to maintain the sensor in the current limiting range of operation
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD 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