Instruction Manual
IB-106-340C Rev. 4.1
July 2004
Rosemount Analytical Inc. A Division of Emerson Process Management Troubleshooting 8-15
Hazardous Area Oxymitter 4000
AlarmsO2 Cell Bad

LOI

KEYPAD

DIAGNOSTIC
ALARMS
TEST
POINTS
HEATERT/C
HEATER
O2 CELL
CALIBRATION
CALIBRATION RECOMMENDED
O2 CELL mV +
O2 CELL mv -
HEATERT/C +
HEATERT/C -
INC INC
DEC DEC
HIGH
GAS
LOW
GAS
CAL
TEST GAS +
PROCESS -
% O2
SW2
TP1 J1
TP2
TP3
RED
YEL
GRN
ORG
TP4
TP5
TP6
ON
37260029
Figure 8-13. Fault 11, Bad Cell
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. T he bad cell alarm activates when the
cell exceeds the maximum resistance
value.
2. T he 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.
8