
Fault 8, LOI
When Fault 8 is detected, the LOI displays the
O2 Temp Low
message.
Recommended action
See the recommended actions in
.
8.5.9
Fault 9, High Heater Temp
Fault 9, membrane keypad
When Fault 9 is detected, the
HEATER LED
flashes five times, pauses for three seconds,
and repeats. If the thermocouple produces a voltage in excess of approximately 30.7 mV,
the high heater temp alarm activates. The 4-20 mA signal returns to the default value (4 or
20 mA).
Figure 8-17: HEATER LED on Membrane Keypad
Recommended action
This alarm is self-clearing.
When temperature control is restored and the thermocouple voltage returns to the
normal range, the alarm clears. If the temperature continues to rise, the next alarm will be
the high high heater alarm.
Troubleshoot
Reference Manual
October 2019
00809-0100-4340
134
Emerson.com/Rosemount
Summary of Contents for Rosemount Oxymitter 4000
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