Campbell Scientific CS650 and CS655 Water Content Reflectometers - Manual (Page 42)

CS650 and CS655 Water Content Reflectometers
10. Troubleshooting
Symptom Possible Cause Solution
All CS650 output
values read 0
No SDI12Recorder
instruction in
datalogger program
Conditional
statement that
triggers reading is not
evaluating as true
Add SDI12Recorder
instruction (P105 for Edlog
dataloggers) to datalogger
program
Check logic of conditional
statement that triggers
readings
First value reads
NAN and all other
values read 0* or
never change from
one measurement to
another
CS650 SDI-12
address does not
match address
specified in
datalogger program
Change probe address or
modify program so that
they match
(*or all values read
NAN if the program
examples in this
manual are followed)
CS650 green wire not
attached to SDI port
specified in
datalogger program
Connect wire to correct
control port or modify
program to match wiring
CS650 not being
powered
SW12V channel not
turning on
Make sure red wire is
connected to 12V or
SW12V and black wire to
G.
If using SW12 to power
sensor, make sure red wire
is connected and
datalogger program
switches SW12 on.
If using SW 12V on a
CR10X, ensure that a wire
connects a control port to
SW12V CTRL and the
program sets that control
port high.
VWC reading is
9999999
Soil bulk permittivity
is outside probe’s
operational range
Modify program to collect
permittivity value and try
soil specific calibration
EC reading is
9999999
Soil bulk electrical
conductivity is
outside probe’s
operational range
If using CS650, try CS655
Readings erratic,
including NAN’s and
9999999’s
Multiple probes with
same SDI-12 address
sharing same control
port
Give probes unique
addresses or put on
separate control ports
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