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Problem
The controller controls or attempts
to control at an inaccurate
temperature
Table 6. Troubleshooting (cont.)
The controller operates normally except when
controlling at a specified set-point. At this set-point, the
temperature shown does not agree with the temperature
measured by a reference thermometer to within the
specified accuracy. This problem can be caused by an
actual difference in temperature between the points
where the control probe and thermometer probe
measure temperature, by erroneous bath calibration
parameters, or by a damaged control probe.
•
Make sure the vernier setting for the set-point.
•
Make sure that the Bath has an adequate amount of
fluid in the tank and that the stirrer operates properly.
•
Make sure the resistance between the pins and the
sheath of the probe. They should be open.
•
Make sure that the thermometer probe and control
probe are both fully inserted into the bath to
minimize temperature gradient errors.
•
Make sure that the calibration parameters are all
correct according to the Report of Test. If not, re-
program the constants. The memory backup battery
may be weak and causing errors in data as
described in the problem: The display flashes
out
and an incorrect process temperature.
•
Make sure that the control probe has not been
struck, bent, or damaged. If the cause of the problem
remains unknown, contact Fluke Calibration.
Causes and Solutions
Calibration Bath
Troubleshooting
Cut-
55
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