If i understood your question right that the transmitter measures the empty portion and you need to show the full portion why not use the kbias as 100 and the mbias as -1 so the output will be PNT=MEAS*-1+100 which is equal to the full portion not the empty where 100 is your full scale Mostafa _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at your own risks. Read http://www.thecassandraproject.org/disclaimer.html foxboro mailing list: //www.freelists.org/list/foxboro to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave