34
SERVICE
To check for thermal equilibrium, initiate a measurement in Manual mode (Section3.3.2)
or navigate to the Diagnostic screen (Section3.3.1) to monitor temperature readings
until the temperature is changing <0.25 °C/min.
2. Turn on the SC-1 controller.
3. Navigate to the Configuration tab.
4. Select Diagnostics.
5. Check the RH Leaf or RH Filter values.
If the values are above 5% RH, the desiccant is exhausted and must be replaced.
a. Remove the desiccant chamber from the bottom of the leaf clip by unscrewing it
counterclockwise.
b. Discard the exhausted desiccant.
c. Refill the desiccant chamber three-quarters full with fresh desiccant.
d. Replace the desiccant chamber on the sensor head.
6. Use tweezers to remove a piece of filter paper from the plastic bag.
NOTE: Do not touch the filter paper. Skin oils will contaminate the disk, resulting in improper readings.
7. Add one drop of DI to the filter paper to saturate it.
8. Allow the water a couple moments to fully absorb into the filter.
9. Still holding the disk with the tweezers, quickly flick the wrist to remove any excess
water.
The paper should glisten, but no water drops should be clinging to the disk.
10. Lay the filter paper flat over the hole in the calibration plate on the side marked Filter
Paper. Make sure the paper completely covers the hole but does not cave into or bubble
out from it.
11. Turn the calibration plate over and carefully examine the hole to make sure that no
meniscus of water is present in the hole.
If excess water is observed, remove the filter paper, dry the calibration plate, and repeat
step7 through 11.
NOTE: If the filter paper becomes too dry to adhere to the calibration plate, it will need to be wet again, and the
calibration procedure will need to be restarted.
12. Make two or three consecutive measurements on the calibration plate.
The resulting values should be within ±10% of the conductance value of the calibration
plate, between 216 to 264 mmol/(m
2
s). If the SC-1 does not return readings within this
range, perfom a user-initiated calibration (step6).
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