9. Troubleshooting and
maintenance
NOTE:
All factory repairs and recalibrations require a returned material authorization (RMA and
completion of the “Declaration of Hazardous Material and Decontamination” form. Refer to
the About this manual page at the front of this manual for more information.
9.1 Troubleshooting
Symptom: Temperature is reported as NAN, –INF, or incorrect temperature.
Verify wires are connected to the terminals specified in the Therm107() instruction: red to
single-ended analogue input (SE or U), black to switched excitation (VX/EX or U), and purple to
ground (⏚).
Symptom: Incorrect temperature is reported.
Verify the Mult and Offset arguments in Therm107() are correct for the desired units
(Data logger programming (p. 6)). Check the cable for signs of damage and possible moisture
intrusion.
Symptom: Unstable temperature is reported.
Probably a result of electromagnetic interference. Try using the 50 Hz or 60 Hz options for the
f
N1
parameter, and/or increasing the settling time as described in Electrically noisy
environments (p. 11) and Long cable lengths (p. 11). Ensure the clear wire is connected to data
logger ground, and the data logger is properly grounded.
9.2 Maintenance
The 107 probe requires minimal maintenance. For air temperature measurements, check the
radiation shield monthly to make sure it is free from dust and debris. To clean the shield, first
remove the sensor. Dismount the shield. Brush all loose dirt off. If more effort is needed, use
warm, soapy water and a soft cloth or brush to thoroughly clean the shield. Allow the shield to
dry before remounting.
Periodically check cabling for signs of damage and possible moisture intrusion.
107 Temperature Probe12
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