Reference Manual
00809-0100-4882, Rev AB
May 2019
Rosemount 5081FG
5-6
Figure 5-7. Fault 3, Shorted Thermocouple
Fault 3, Shorted Thermocouple
The thermocouple connections are shorted. The
fault displays as shown in Figure 5-7.
1. Allow adequate time for the oxygen probe
to reach operating temperatures. Probe
temperatures below approximately 500°C
(932°F) may result in this fault.
2. Refer to Figure 5-4. Using a multimeter,
measure between terminals 8(-) and 10(+).
3. If the multimeter reading, in voltage mode,
is between -0.5 and +0.5 mV, the
thermocouple is shorted.
4. If the thermocouple is shorted, replace the
oxygen probe per Oxygen Probe
Replacement in Section 6: Maintenance
and Service.
5. If the thermocouple is not shorted, then
replace the faulty analog or CPU board per
Electronics Replacement in Section 6:
Maintenance and Service.
Figure 5-8. Fault 4, High Probe Temperature
Fault 4, High Probe Temperature
The probe's temperature has exceeded the
maximum cell temperature setpoint. The fault
displays as shown in Figure 5-8.
1. If the probe temperature exceeds the
maximum cell temperature setpoint, the
4-20 mA signal output will become invalid
and go to the default value.
2. Verify that the upper cell temperature
setpoint is configured as desired under the
PROGRAM MENU in Section 3: Startup
and Operation.
Summary of Contents for Rosemount 5081FG
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