Optionally, a pressure sensor may be placed on the output side of the pump to provide an indication of an empty reservoir or {HEAD ~ a substantial blockage} in {TAIL ~ the distribution system}  
Optionally , a pressure sensor may be placed on the output side of the pump to provide an indication of an empty reservoir or { HEAD ~ a substantial blockage } in { TAIL ~ the distribution system }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH