Level Measurement using Differential Pressure Transmitter


I am bit confused regarding DPT calibration ranges .My DPT is installed in steam condensate vessel.
1.)Can by seeing the ranges of DPT (0 to 100mmwc) or (-100 to 0 mmwc) one can predict Wet leg compensation is being done or not.?( My HP tapping is connected to bottom of vessel and LP tapping to top of the vessel)
2.I have observed condensate pot in both HP tubings as well as LP tubings.What could be the possibel reason for that?Does it affect my calibration.