Figure 8-13. Fault 11, Bad Cell - Emerson Oxymitter 4000 Instruction Manual

Oxymitter 4000
DIAGNOSTIC
ALARMS
CALIBRATION RECOMMENDED
TEST
POINTS
INC INC
HIGH LOW
GAS GAS
DEC DEC
KEYPAD
Alarms
O2 Cell Bad

Figure 8-13. Fault 11, Bad Cell

Rosemount Analytical Inc. A Division of Emerson Process Management
HEATER T/C
HEATER SW2
O2 CELL
CALIBRATION
J1
O2 CELL mV +
TP1
O2 CELL mv -
TP2
HEATER T/C +
TP3
HEATER T/C -
TP4
CAL
TEST GAS +
TP5
PROCESS -
TP6
% O2
LOI
37260029
k. Fault 11, Bad Cell
Figure 8-13 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 11 is de-
tected, the O2 CELL flashes three times,
pauses for three seconds, and repeats.
1. The bad cell alarm activates when the
cell exceeds the maximum resistance
value.
2. The cell should be replaced. See para-
graph 9-4i, Cell Replacement, for cell
replacement instructions.
LOI. When Fault 11 is detected, the LOI
displays the "O2 Cell Bad" message. Refer
to the comments and procedures in para-
graphs 1 and 2 above.
Instruction Manual
IB-106-340 Rev. 3.0
December 2003
Troubleshooting 8-15