you can, save your sensor data to your desktop, now open that in notepad.
look for:
12, "CODE_SENSORPARA0ITEM2", 452
13, "CODE_SENSORPARA0ITEM3", 250
change the 452, 250 with your values...
PH2 on a EX box is at:
1012, "CODE_SENSORPARA8ITEM2", 422
1013, "CODE_SENSORPARA8ITEM3", 227
save and re-upload