In general it stands for a condition in which there is a lag in response exhibited when reacting to changes in external forces so that although the conditions have been met for the affected body to return to its original state it does not for some time.
Capacitance type humidity sensors (HHA-3151, HHB-3101) used in our High Precision Wide Range Temperature and Humidity Data Loggers will exhibit hysteresis upon returning to normal from very high humidity. Differences of ±1.5%RH may occur.
Moreover, when used in high temperature and high humidity environments (50℃/75%, 60℃/50%, 70℃/35%, and 80℃/25%) sensor hysteresis may become even larger and exceed ±1.5%RH. Note that under certain circumstances, it may take several days to return to normal.
RTR-500 Series, TR-700W Series, TR-7Ui Series, TR-7wf/nw Series
September 02, 2016