| Description: | The temperature/humidity sensor has not been calibrated since 6/18/2007. It failed four
6-month field calibration checks during this time, but has passed all field calibration
checks after 4/25/2013.
In comparison with a nearby instruments, there is evidence of the sensor relative humidity
reading lower than expected, especially in high humidity/nighttime situations. There is
also evidence of a possible small cold bias in the temperature data. An exit calibration
will characterize severity when the sensor is replaced.
In general, the relative humidity may have been subject to drift during this time. The
manufacturer characterizes sensor drift at <1% / year. |