Campbell Scientific CS215 Temperature and Relative Humidity Probe - Manual (Page 22)

CS215 Temperature and Relative Humidity Probe
8.1.3 Power Conservation
The CS215 draws less than 70 µA of current between measurements. In most
applications, this is insignificant compared to the datalogger and other power
uses, so the sensor can be permanently connected.
In low-power applications, battery power can be conserved by turning the 12 V
supply to the CS215 on just before the measurement (allowing a ‘warm-up’
time of at least 100 ms) and then turning it off afterwards. If available, the
switched 12 V output of the datalogger can be used.
8.2 Measuring Multiple SDI-12 Sensors
Up to ten CS215s or other SDI-12 sensors can be connected to a single
datalogger control port. Each SDI-12 device must have a unique SDI-12
address between 0 and 9.
9. Troubleshooting and Maintenance
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
Assistance page at the beginning of this manual for more
information.
9.1 Troubleshooting
Symptom: Temperature is reported as –9999 or NAN, and relative humidity is
reported as 0 or as an unchanging value.
Recheck wiring. Verify the green wire is connected to the control port
specified by the SDI12Recorder() instruction. Verify the red wire is
connected to a 12V terminal.
Check the voltage to the sensor with a digital voltage meter. If a switched 12V
terminal is used, temporarily connect the red wire to a 12V terminal (non-
switched) for test purposes.
Verify the probe’s SDI12 address matches the address entered for the
SDI12Recorder() instruction. The default address is 0. The address can be
verified or changed with the commands described in Appendix D, SDI-12
Sensor Support.
Remove the filter tip and verify that the sensing element has been installed
with the proper orientation as described in Section 9.4, Sensor Element
Replacement.
Symptom: Incorrect temperature or relative humidity is reported.
If using the SW12 terminal to power the sensor, verify the program is allowing
a warm-up time of at least 100 ms.
Check to see if the filter tip has been contaminated. Replace the filter tip (pn
18142), or clean with distilled water as needed.
NOTE
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