I don't have Unty Pro Handy, but you can do it the same with any software.
Read and store in a register the analog value
Start a timer
When the timer times out:
read the analog value
check to see if the new is greater or less than the old
based on the above subtract the smaller from the larger
divide by the time interval to get rate of change
use a compare to see if the rate of change is greater than you limit
reset the timer
Go to first step and repeat