DEFINITION OF DRIFT : Sensor drift is a gradual deviation in the output signal  of a transducer from the true pressure value, even though the actual process pressure remains constant Example: If a transducer is calibrated so that 0 psi = 4 mA, over time it might read 4.2 mA at 0 psi  (indicating false pressure). That small shift can lead to hundreds of psi error  at higher pressures. Causes of Sensor Drift in Melt Pressure Applications: High Temperature Effects Continuous exp