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7381
User's Guide
Problem
The displayed process
temperature is in error and the
controller remains in the cooling or
the heating state at any set-point
value
54
Table 6. Troubleshooting (cont.)
Possible causes may be either a faulty control probe or
erroneous data in memory.
•
The probe might be disconnected, burned out, or
shorted. The Probe is insided the stirrer motor cover.
•
Make sure that the probe is connected properly.
Check the probe with an ohmmeter to see if it is
open or shorted. The probe is a platinum 4-wire Din
43760 type. The resistance should read 0.2 Ω to
2.0 Ω between pins 1 and 2 on the probe connector
and 0.2 Ω to 2.0 Ω between pins 3 and 4. The
resistance should read from 100 Ω to 300 Ω
between pins 1 and 4 depending on the temperature.
If the probe is defective, contact Fluke Calibration.
•
If the problem is not the probe, erroneous data in
memory can be the cause. Re-initialize the memory
as discussed in the problem The display flashes
out
and an incorrect process temperature. If the
problem remains, the cause may be a defective
electronic component, contact Fluke Calibration.
Causes and Solutions
Cut-
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