6. Pyranometer maintenance. Gently clean the pyranometer first with a spray of distilled/clean
water and next with a soft damp cloth. Install the bird spike kit if bird droppings are present
(Optional bird spike kit (p. 17)).
Calibrate or replace the pyranometer every two years. The pyranometer calibration number
needs to be changed when the funnel containing the pyranometer is replaced. Campbell
Scientific will send a calibration certificate listing the new number with the recalibrated or
replaced pyranometer. An extended SDI-12 command is used to replace the calibration
number (Extended commands (p. 47)). Contact Campbell Scientific for more information.
To determine if the pyranometer needs to be cleaned or recalibrated, compare the data
from one or more clear sky days with data calculated using a clear sky calculator. Several
clear sky calculators are available online.
If the pyranometer data is less than the comparison clear sky data on a clear day, the
pyranometer sensor is dirty or needs to be calibrated. Collect and review a couple days of
data to be sure it wasn’t a bird covering the sensor.
7. Relative humidity and barometric pressure maintenance. A field-replaceable module
contains the barometric pressure and relative humidity sensors. This module is under the
Teflon screen (FIGURE 9-4 (p. 33)) and should be replaced every two years.
9.2 Troubleshooting
Symptom: NAN readings. NAN readings indicate the data logger isn't receiving data from the
ClimaVUE 50.
1. Check that the sensor is wired to the control or U terminal specified by the
SDI12Recorder() instruction.
2. Check the voltage to the sensor with a digital voltage meter. If a switched 12V terminal is
used and programmed using CRBasic (not Short Cut), temporarily connect the red wire to a
12V terminal (non-switched) for test purposes.
3. Verify the probe SDI-12 address matches the address entered for the SDI12Recorder()
instruction. The address can be verified or changed with the commands described in SDI-12
sensor support (p. 41).
Symptom: Not reading any rain
1. Remove debris from rain gage (see step 5 in Maintenance and calibration (p. 30)).
2. Check the sensor level. The ClimaVUE 50 must be within approximately ±2 degrees of dead
level (0, 0) in both the X and Y directions to accurately measure rainfall. If not within this
ClimaVUE 50 Compact Digital Weather Sensor 35
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