Emerson Rosemount Oxymitter 4000 Reference Manual page 119

July 2018
Figure 8-12. Fault 10, High Cell mV
LOI
When Fault 10 is detected, the LOI displays the"O
1.
2.
3.
Troubleshooting
Remove power. Unscrew and remove the LOI module from the electronic
assembly.
Reconnect power to the Oxymitter 4000.
Perform the diagnostic steps 1 through 4 shown for the membrane keypad.
LOI
Cell Open" message.
2
1. Using a multimeter, measure a
TP2-. If you measure 204 mV
Rosemount Oxymitter 4000 DC, the cell reading is due to
combustibles.This is a self-cle
the combustible conditions go
If you measure 1.2 VDC, the c
orange or green, have becom
the input.
2. One possible cause is connect
or green wire has come loose
connection.
3. The platinum pad could also be
The pad could have broken fre
of the cell.
4. Replace heater strut per "Heat
Replacement" in Section 9: M
Service. If necessary, replace
flange assembly per "Cell Rep
Section 9: Maintenance and S
LOI
When Fault 10 is detected, the LOI
Cell Open" message.
1. Remove power. Unscrew and rem
module from the electronic ass
2. Reconnect power to the Oxymit
3. Perform the diagnostic steps 1
shown for the membrane keypa
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