If the reported values for temperature and/or relative humidity from a CS215-L are not valid numbers, what should be done?

If the values are not within the published range of the sensor, there are several things to check:

  1. If the yellow cap has not already been removed, remove it.
  2. Verify that the program is correct without additional multipliers or offsets.
  3. Ensure that the filter and radiation shield are clean so that air can freely flow into and past the sensor.
  4. If the first value returned in the array is NAN, this is usually an indication that the data logger is unable to communicate with the sensor. This could be caused by a power issue, an incorrect SDI-12 address, one or more disconnected wires, or a broken sensor. 

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