Model 109 Temperature Probe
10
Scientific suggests doubling the settling time every 50 ft. The following code
snip examples increase settling time by 20000 µs by placing
20000
as the
argument in the
SettlingTime
parameter:
CR6-series datalogger example:
Therm109
(
T109_C,1,U1,U10,
20000
,60,1.0,0.0
)
CR800-series and CR3000 dataloggers example:
Therm109
(
T109_C,1,1,1,
20000
,_60Hz,1.0,0.0
)
A setting time parameter is not available for CR200(X)-series dataloggers.
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
page at the beginning of this manual for more
information.
9.1 Troubleshooting
Symptom: Temperature is reported as
NAN, –INF
, or incorrect temperature.
Verify wire leads are connected to the terminals specified in the
Therm109()
instruction: red to single-ended analog input (
SE
or
U
), black
to switched excitation (
VX
/
EX
or
U
), and purple to ground (
⏚
).
Symptom: Incorrect temperature is reported.
Verify the
Mult
and
Offset
arguments in
Therm109()
are correct for the
(p. 5)
). Check the cable
for signs of damage and possible moisture intrusion.
Symptom: Unstable temperature is reported.
Probably a result of electromagnetic interference. Try using the 50 Hz or
60 Hz options for the
Fnotch
parameter, and/or increasing the settling
Electrically Noisy Environments
(p. 9)
, and
(p. 9)
. Ensure the clear wire is connected to
datalogger ground, and the datalogger is properly grounded.
9.2 Maintenance
The 109 probe requires minimal maintenance. For air temperature
measurements, check the radiation shield monthly to make sure it is clean and
free from debris. Periodically check cabling for signs of damage and possible
moisture intrusion.
NOTE