Suppose i have a transmitter whose range is 0-9528 mmh20? Is it possible for anyone to extend these range values to any extent,say 20,000 or even more?Upto what extent can be values be fed into the transmitter,before the hart communicator will say "Upper values too high"

 

Look at the model number of the transmitter, and then look up the datasheet for that transmitter. You'll find the max measurement range there.