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8 Troubleshooting
8.1 Troubleshooting
In the event that the probe appears to function abnormally, this section may
help to find and solve the problem. Several possible problem conditions are de
-
scribed along with likely causes and solutions. If a problem arises, please read
this section carefully and attempt to understand and solve the problem. If the
probe seems faulty or the problem cannot otherwise be solved, contact an Au
-
thorized Service Center (see Section 1.3) for assistance. Be sure to have the
model number and serial number of your probe available.
Problem Solution
Data changes
•
Slight mechanical shock can cause temperature errors
as much as 2mK. If this is observed, first measure and
record the R
tp.
Next anneal the SPRT at 480°C (5680
and 5682) or 661° (5699 only) overnight. Measure the
R
tp
again. The annealing should decrease the R
tp
. Re
-
peat the annealing, R
tp
measurement cycle several
times. When the R
tp
is stable, recalibrate the SPRT. If
the R
tp
does not stabilize, contact a Hart Scientific Autho-
rized Service Center.
•
Oxidation of the platinum sensor may occur after pro-
longed use between 200 – 450°C. R
tp
will show an in-
crease. To reduce the effects of oxidation, anneal the
SPRT at 480°C (5680 and 5682) or 661°C (5699 only)
overnight (12 hours). Measure the R
tp
again. Repeat the
annealing, R
tp
measurement cycle several times This an-
nealing process should return R
tp
to within calibration tol-
erances. If the R
tp
is within calibration tolerance, the
SPRT is usable. If the R
tp
is not within calibration toler
-
ance, but it is stable, recalibrate the SPRT.
•
Severe mechanical shock can permanently damage the
SPRT. If annealing the SPRT does not resolve the data
change, contact an Authorized Service Center.
Data unstable
•
If the data is unstable at the Triple Point of Water
(TPW), check the connection first. If this action does not
fix the problem contact a Hart Scientific Authorized Ser
-
vice Center. The SPRT may be damaged and need re
-
pair.
•
If the data is unstable at high temperatures, it may be
due to electrical noise in the system. Reduce the tem
-
perature and observe the data. If it is stable, electrical
noise is interfering with the measurements at high tem
-
peratures. Check the grounding of the readout device
and the heat source. A faulty ground on either device
could interfere with high temperature measurements. A
ground lead wire (the fifth wire) of the SPRT may help to
reduce electrical noise interference. Be sure the ground
lead wire is connected to an appropriate ground on the
read-out device.
21
8 Troubleshooting
Troubleshooting
1.888.610.7664 sales@GlobalTestSupply.com
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