SGP/MET/E13 - Temperature/humidity sensor occasionally failed 6-month field calibration 
checks

The temperature/humidity sensor was not calibrated annually during this time. The 
temperature/humidity readings failed the 6-month field calibration check on four occasions during 
this period (temperature reading low, humidity reading high). Upon removal, the field 
calibration check reported the humidity reading was high (+4%).

In general, the relative humidity may have been subject to drift during this time. The 
manufacturer characterizes sensor drift at <1% / year.

Please contact the mentor for specific information regarding the field calibration 

check results, if necessary.

• rh_mean
• temp_mean
• vapor_pressure_mean