I am facing a problem with simulation of some current instruments installed in a plant. In some instruments after implementing square root the value in Dcs for 4mA is not coming zero. Instead,it is giving a value of supposedly 25.00 when 4mA is forced through HART (ABB-DHH) for a range of 0-2000 NM3/Hr. Can somebody tell me why is this happening and how to rectify it so that the value comes as zero at 4mA as required by me? I have tried a few things by changing some parameters in the DCS side but did not get the desired result....can somebody give me a solution to this?????