The adjustable mounting of the gas flow tube enables {HEAD ~ optimum operation} of the flowmeter for {TAIL ~ widely ranging gas flow rates} 
The adjustable mounting of the gas flow tube enables { HEAD ~ optimum operation } of the flowmeter for { TAIL ~ widely ranging gas flow rates }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL