Answer / ginoop

range =lrv & urv
eg: 50 to100mmwc

span= urv-lrv
eg : span of 50 to 100mmwc
=100-50
ie span=50

Answer / r_vaya

Range is operating units of Instruments from lower to higher 

Span is the gap between range. 

Answer / r_vaya

Suppose Transmiter is calibrated at -100 to + 100.
Determining it's LRV =. -100     And.    URV. =. +100

Thus in above case :

Range is -100 to + 100 
Span is 200 

Because,
Span is the gap between LRV  and  URV 
That'swhy (+100) - (-100) = 200 become a Span 

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