Thermal Drift

Temperature Interference

Physical materials within the sensor expand or change their electrical properties as they heat up. This expansion creates internal stresses that the transducer interprets as external force, leading to a false reading. In high temperature molding, this interference can be large enough to mask real changes in cavity pressure.

Measurement Deviation

Gradual rises in the baseline pressure signal over the course of a production run indicate that the sensor is drifting. This deviation can cause the machine controller to reduce injection pressure prematurely, resulting in short shots or sink marks. Operators must identify this trend to avoid running defective parts.

Calibration Adjustment

Resetting the sensor to zero at a specific point in each cycle compensates for the temperature shift. This dynamic adjustment ensures that each cycle starts from a true baseline, maintaining process consistency.