DQRID : D170322.12
Start DateStart TimeEnd DateEnd Time Data Quality Metric
08/19/20110000Open Ended0000Does not affect quality
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Subject:
SGP/MET/E38 - Temperature/humidity sensor failed a 6-month field calibration check
DataStreams:sgpmetE38.b1
Description:
The temperature/humidity sensor has not been calibrated since 8/19/2011. The temperature 
reading failed a 6-month field calibration check on 10/16/2012 (read low), but has passed 
all subsequent field calibration checks.

In comparison with a nearby Mesonet site, there is evidence of the sensor relative 
humidity reading lower than expected. 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.
Suggestions: 
Please contact the mentor for specific information regarding the field calibration 

check results, if necessary.
Measurements:sgpmetE38.b1:
  • vapor_pressure_mean
  • temp_mean
  • rh_mean
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