Emerson Rosemount Oxymitter 4000 Instruction Manual page 104

Oxymitter 4000
Figure 8-8. Fault 6, High High Heater Temp
DIAGNOSTIC
CALIBRATION RECOMMENDED
Alarms
Very Hi O2 Temp
8-12
HEATER
CALIBRATION
KEYPAD
LOI
Fault 6, High High Heater Temp
Figure 8-8 shows the electronic assembly for an
Oxymitter 4000 with a membrane keypad (upper
view) and an Oxymitter 4000 with an LOI (lower
view).
Membrane Keypad
When Fault 6 is detected, the HEATER LED
flashes twice, pauses for three seconds, and
repeats.
1. The High High Heater Temp alarm will
activate when the thermocouple produces
a voltage of 37.1 mV [1652°F (900°C)].
2. The triac and the temperature control may
be at fault.
3. Remove power. Allow Oxymitter 4000 to
cool for five minutes. Restore power.
4. If the condition repeats, replace the
electronic assembly per "Electronic
Assembly Replacement" in Section 9:
Maintenance and Service.
LOI
When Fault 6 is detected, the LOI displays the
"Very Hi O2 Temp" message.
1. The very high O2 temperature alarm will
activate when the thermocouple produces
a voltage of 37.1 mV [1652°F (900°C)].
2. The triac and the temperature control may
be at fault.
3. Remove power. Allow the Oxymitter 4000
to cool for five minutes. Restore power.
4. If the condition repeats, replace the
electronic assembly per "Electronic
Assembly Replacement" in Section 9:
Maintenance and Service.
Instruction Manual
IM-106-340, Rev. 4.3
July 2017