9.2 Troubleshooting
Symptom: Temperature is NAN, –INF, –9999, –273
Verify wiring of sensor to the data logger; cross-reference data logger program or the
measurement system wiring diagram.
Symptom: Incorrect Temperature
Check the cable for signs of damage and possible moisture intrusion.
Symptom: Unstable Temperature
Make sure the shield and ground wires are connected to data logger ground, and the data
logger is properly grounded.
10. References
WMO, 2008.
Guide to Meteorological Instruments and Methods of Observation
. World
Meteorological Organization No. 8, 7th edition, Geneva, Switzerland.
WMO, 2021.
Instruments and Observing Methods, Generic Automatic Weather Station (AWS)
Tender Specifications.
. World Meteorological Organization, Report 136, Geneva, Switzerland.
AASC, 1985: The State Climatologist (1985) Publication of the American Association of State
Climatologists:
Heights and Exposure Standards for Sensors on Automated Weather Stations
,
v. 9, No. 4 October, 1985. (www.stateclimate.org/publications/state-climatologist/NOAA-
NCY-SCBOOKS-SC77097/00000029.pdf)
EPA, 2008:
Quality Assurance Handbook for Air Pollution Measurement Systems
, Vol. IV,
Meteorological Measurements, Ver. 2.0, EPA-454/B-08-002 (revised 2008). Office of Air
Quality Planning and Standards, Research Triangle Park, NC 27711.
TempVue 20 SDI-12 PT-100 Class A, Precision Air Temperature Sensor
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