Reversible Storage-Induced Bias in Polymer Capacitive Relative Humidity Sensors

TRH Development data fom VOC impact testing. Compact temperature–relative humidity (TRH) sensors are widely used in regulated environments where measurement accuracy directly influences compliance and product stability. While calibration establishes traceability under controlled laboratory conditions, deployed sensors frequently operate in environments characterized by limited airflow, thermal coupling to supporting electronics, and handling disturbances that are absent during calibration. A companion study demonstrated that airflow constitutes a first-order influence quantity in capacitive RH measurement [1]. The present work extends those findings by quantifying three deployment influence quantities in the specific compact TRH assembly geometry used in regulated-environment monitoring applications: handling-induced thermal transients, conductive heating from the supporting radio printed circuit assembly (PCA), and airflow-dependent boundary-layer effects.