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8-1
Chapter 8
Troubleshooting
8.1 Troubleshooting
In the event that the probe appears to function abnormally, this section may be of
use in solving the problem. Several possible problem conditions are described
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 Authorized
Service Center (see Section 1.3) for assistance. Be sure to have the model
number and serial number of your probe available.
Problem Causes and Solutions
Data changes greater than
0.1 °C are observed
• Mechanical shock can cause temperature
errors as great as 0.5 °C. If this is
observed, first measure and record the
R
tp
. Next anneal the PRT at 660°C
overnight. Measure the R
tp
again. The
annealing should decrease the R
tp
. If the
R
tp
is stable, recalibrate the PRT.
Data changes less than
0.1 °C
• Slight mechanical shock can cause
temperature errors less than 0.1 °C. If this
is observed, first measure and record the
R
tp
. Next anneal the PRT at 660 °C
overnight. Measure the R
tp
again. The
annealing should decrease the R
tp
.
Repeat the annealing, R
tp
measurement
cycle several times. When the R
tp
is
stable, recalibrate the PRT. If the R
tp
does
not stabilize, contact an Authorized
Scientific Service Center (see Section
1.3).
• Oxidation of the platinum sensor may
occur after prolonged use between 200 –
450 °C. This oxidation will demonstrate
itself by an increase in R
tp
of less than
0.1 °C. To reduce the effects of oxidation,
anneal the PRT at 600 – 661 °C overnight
(12 hr.). Measure the R
tp
again. Repeat
the annealing, R
tp
measurement cycle
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