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

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

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
37260029
Instruction Manual
k. Fault 11, Bad Cell
Figure 8-13 shows the electronic assembly
for a Hazardous Area Oxymitter 4000 with
a membrane keypad (upper view) and a
Hazardous Area Oxymitter 4000 with an
LOI (lower view).
Membrane Keypad. When Fault 11 is
detected, 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 9-4h, 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.
IB-106-340C Rev. 4.1
July 2004
Troubleshooting 8-15
8